What kind of corrugated sheeting is best to cover the roof. How to choose corrugated roofing. Corrugated sheeting with index NS45

In most cases modern Construction Materials intended for intended use. It is with their intended use that all their advantages can be fully appreciated. As an exception, metal profiled sheets are one of the few universal building materials today. It is used with equal success for covering roofs, cladding building facades, and producing wall and roofing sandwich panels, manufacturing various structural elements modular buildings and structures, construction of fences.

Such wide scope application has led to the need to produce a large number of grades of corrugated sheets, significantly different from one another. In order to understand all this diversity and decide which corrugated sheet to choose for the roof, you need to know the characteristics of the different types of profiled sheets. These main characteristics include:

• sheet thickness, and, consequently, the weight of 1 m2 of corrugated sheeting;
• height and type of surface profile;
• type and quality of metal protective coating;
• protective color decorative covering;

Main types of corrugated roofing

Today on the market there is a large number of large and small manufacturers of metal profiled sheets, many of which have developed their own technical specifications for their products. But, nevertheless, the best corrugated roofing is made in accordance with GOST 24045-94.

The standard regulates:

1. Quality of raw materials.
2. Geometric dimensions of profiles of various brands.
3. Rules for product labeling.
4. Requirements for quality control of finished products.
5. And even requirements for storage, packaging and transportation of corrugated sheets.

In accordance with GOST 24045-94 there are the following types corrugated roofing:

• metal profiled sheet with increased load-bearing capacity, marked with the index “H”;
• wall corrugated sheeting, marked with the letter “C”;
• universal profiled sheet used in the manufacture of both horizontal and vertical structures, designated by the letters “NS”;

When choosing which corrugated sheeting is best for the roof, it is best to choose the “N” and “NS” brands. It is these types of corrugated sheets for roofing that have a profile shape and height that provide it with maximum load-bearing capacity. This is very important for roofing coverings, which often must withstand quite significant static loads (for example, from snow that has fallen in winter).

The increased load-bearing capacity of corrugated sheeting is achieved by large waves and a special configuration. Often these types of roofing sheeting have additional stiffening ribs, which further increase the load-bearing capacity and longitudinal rigidity of the profile.

The choice of corrugated sheeting for the roof, first of all, significantly depends on the design of the roof. Its slope is of particular importance. The smaller it is, the more weight the roofing will have to withstand. In particular, depending on what corrugated sheeting is used for the roof, the performance characteristics roof of the building.

For example, if we are talking about a roof country house with a large slope, then in in this case You can use profiled sheet C10. This corrugated sheet can withstand only minimal loads, including wind loads, so a continuous sheathing will be required.

However, C10 is one of the cheapest brands of corrugated sheets, which is most often used for siding. Therefore, using it will save you quite a decent amount. But it is worth considering that C10 can only be used for installation on a steep roof of a small area in the absence of strong winds.

If we are talking about a flat roof in use, then a load-bearing profiled sheet with additional stiffening ribs H-60 ​​or H-75 is required. In this case, the roof will withstand not only a serious snow load, but also the weight of a person.

Brands of corrugated sheets: which corrugated sheeting to choose for the roof depending on the magnitude of the design load?

As mentioned above, one of the main characteristics of a metal profiled sheet is its load-bearing capacity, which is determined by the height of the profile trapezoid. The table below shows what type of corrugated roofing sheet with the highest load-bearing capacity is available, its characteristics and scope of application.

In order to decide what kind of corrugated roofing is needed in your case, you need to know fairly accurately the load that the roof will withstand during operation. To do this, it is necessary to determine the snow and wind load acting on our roof.

The snow load depends on the region in which the building under construction is located. So for the 3rd snow region it is 180 kg/m². The estimated wind load in the same region will be 32 kg/m2.

When determining the wind load for a specific roof, you need to take into account its slope. To do this, the calculated value of wind pressure is multiplied by the ratio of the height of the roof to the length of the projection of its slope. To the resulting total load you need to add the weight of the corrugated sheet itself.

Depending on the result obtained, we determine what kind of corrugated roofing we need. The maximum permissible loads for the most common grades of corrugated sheets are given in the table.

Load Limit Table

Brand corrugated sheets	Step supports, m
		Scheme support 1	Scheme support 2	Scheme support 3	Scheme support 4
S10-1000-0.6	1,2	50	83	68	64
S18-1000-0.6	1,8	56	140	115	109
S21-1000-0.6	1,8	101	253	208	195
С44-1000-0.55	1,5	512	235	267	256
	3,0	64	118	134	128
S44-1000-0.6	1,5	556	307	349	335
	3,0	69	154	175	167
S44-1000-0.7	1,5	658	474	540	518
	3,0	82	211	264	245
S44-1000-0.8	1,5	747	650	741	711
	3,0	93	240	300	280
N60-845-0.7	3,0	323	230	269	257
	4,0	-	-	184	-
N60-845-0.8	3,0	388	324	378	360
	4,0	-	203	254	-
N60-845-0.9	3,0	439	427	504	482
	4,0	-	240	300	-
N75-750-0.9	3,0	645	617	771	720
	4,0	293	247	434	-
N114-750-0.8	4,0	588	588	735	-
	6,0	193	261	-	-
N114-750-0.9	4,0	659	659	824	-
	6,0	218	293	-	-
N114-750-1.0	4,0	733	733	916	-
	6,0	244	325	-	-

So, for example, with a distance between supports of 3 m, the maximum permissible load for corrugated sheeting N60-845-0.8 is 360 kg/m², and for corrugated sheeting N57-750-0.8 - 409 kg/m². As can be seen from the above example, the choice of which corrugated sheet is best to cover the roof is significantly influenced not only by the height of the profile trapezoid, but also by the width of the sheet.

In addition to the above, when deciding which corrugated sheet is best to cover the roof with, you need to take into account the thickness of the metal. The service life of the roofing directly depends on the thickness of the metal. It is believed that an increase in the thickness of the corrugated sheet by 0.1 mm extends the service life of the roofing covering by approximately 5 years.

In addition, the load-bearing capacity of the profiled sheet depends on the thickness of the metal. For example, the bearing capacity of corrugated sheet H57-750, 0.7 mm thick, is 295 kg/m², and the same corrugated sheet 0.8 mm thick will withstand a load of 409 kg/m².

Thus, by changing the thickness and width of the sheet, you can achieve an almost threefold difference in the maximum permissible load for the same brand of corrugated sheet. This is important if the area of ​​your roof is large, since the cost of covering it will seriously depend on what kind of corrugated roofing will be used.

In particular, you can take a profiled sheet with a trapezoid height of 57 mm, but with a large metal thickness and a smaller sheet width. In terms of its load-bearing capacity, this option will even exceed the N-60 corrugated sheet minimum thickness sheet, and will not critically lose to the N-75.

Before choosing corrugated sheeting for a roof with a slight slope and a large distance between supports, you need to check whether the profile has additional stiffeners. Despite their apparent insignificance, they seriously increase the load-bearing capacity of the profiled sheet.

Since not only load-bearing capacity is important for a roof, but also maximum tightness, this criterion should also be taken into account when deciding which corrugated sheet to choose for the roof. In particular, if possible, it is better to choose corrugated roofing sheeting with a capillary groove along the edge of the sheet. In this case, even an overlap in one wave will allow you to do without additional sealing of the joints.

Types of corrugated sheet coverings: which corrugated roofing is better based on durability criteria?

Metal profiled sheets are made from cold-rolled sheet steel with galvanic zinc coating. The reliability of such protection depends, first of all, on the thickness of the zinc layer.

Rolled metal manufacturers produce sheet steel with different thicknesses of zinc coating; it can be from 100 to 300 g/m². Therefore, before choosing a corrugated sheet for the roof, ask whether the metal from which the corrugated sheet is made meets the standard requirements.

Types of corrugated roofing - photo of covering with galvanized load-bearing corrugated sheet

According to GOST 24045-94, zinc consumption for protective covering must be at least 275 g/m2. A profiled sheet with such a coating is guaranteed to last 15-20 years without the slightest sign of corrosion.

Please keep in mind that galvanizing is the most primitive and short-lived way to protect profiled sheets from corrosion. Galvanized corrugated sheets are usually used for temporary fences and buildings, as well as for outbuildings. In the vast majority of cases, much more durable corrugated sheeting with a polymer protective and decorative coating is used for the roof.

Such a profiled sheet is more expensive, but, in addition to a purely decorative function, the polymer coating provides additional protection metal surface and increases the service life of the corrugated sheet more than twice. Therefore, when choosing which corrugated sheet is best for the roof, it is best to choose this option.

One of the options for which corrugated sheet to cover the roof with is polymer corrugated sheeting and the structure of its coating

There are several types of polymer coatings for profiled sheets. The most commonly used are polyester, plastisol, pural and PVDF. In order to determine which corrugated sheet is best for the roof, you need to know the characteristics of these coatings and their differences.

Polyester is the coating of a metal profiled sheet with polyester paint. This is the most budget-friendly coverage. It is applied in a layer 20-30 microns thick and can have either a glossy or matte surface. This coating has good resistance to ultraviolet radiation and temperature changes. But due to its small thickness, the polyester coating must be protected from mechanical damage.

Plastisol is a mixture of polyvinyl chloride with various plasticizers. This coating is significantly thicker and allows you to reproduce the surface texture of various natural building materials. Plastisol is highly resistant to almost all external influences.

Pural is a coating made of polyurethane-polyamide paint. Its surface has a silky matte structure. A pural coating is applied in a layer up to 200 microns thick and has increased resistance to mechanical and chemical influences.

PVDF (polyvinyl difluoride acrylic paint) coating began to be used in the manufacture of corrugated sheets relatively recently. It is extremely resistant to ultraviolet radiation and various aggressive environments.

Coverage must be selected based on your climatic conditions and the desired service life of the profiled sheet. For example, if you live on the sea coast, then you need to buy the corrugated roofing sheet that best withstands aggressive environments.

In this case, the most reliable coating would be PVDF or pural, which will easily withstand the damaging effects of salty sea air and strong winds more than a dozen years. Choosing a polyester coating, even though it costs much less, is not advisable, since the smallest particles of salt in sea ​​air in combination with wind they have an abrasive effect.

For ordinary country house located in a temperate climate, it is better to use a profiled sheet coated with polyester or plastisol. The use of expensive pural will simply unjustifiably increase the cost of the roof.

Thus, when deciding which corrugated sheet is needed for the roof, it is necessary to take into account maximum amount known factors. This includes the climatic conditions of the area in which construction is taking place.

Corrugated sheet for roofing - how to choose the color of the protective and decorative coating?

When choosing which corrugated sheeting is best for the roof of your house, you need to pay serious attention to the color of the roofing. The roof color can be anything from white to black. But you need to remember that it must correspond to the architectural style of the building and be in harmony with the materials chosen for finishing the facade of the house.

In addition, it is highly desirable that the color be practical and do not require special care. So, when choosing corrugated roofing, how to choose the color of the coating?

There are three main standards for painting polymer coatings of profiled metal sheets. These are RR, RAL and HTS. Most often, corrugated sheeting manufacturers use the German RAL standard. This is due, first of all, to its convenience.

In this standard, each shade has an individual four-digit digital code. At the same time, despite the presence of more than a thousand colors and shades in the RAL palette, there are less than ten main ones. The main color is encrypted with the first digit of the four-digit code. One corresponds to thirty shades of yellow, two corresponds to thirteen shades of orange, three corresponds to twenty-five red colors, and so on.

Most often, corrugated sheeting in the colors “Moss Green” (RAL-6005), “Chocolate” (RAL-8017) and “Red Wine” (RAL-3005) is used for roofing.

Corrugated sheeting is one of the most inexpensive and beautiful roofing coverings. Reliable, durable and has the classic design, which will never go out of style. But it is not uncommon for rusty streaks to appear on a new and bright roof after two or three years.

Therefore, let's study in more detail the question of what kind of corrugated roofing is needed, what is its advantage over other roofing materials, in what formats it is produced and how to understand complex markings.

Galvanized steel is one of the most widely used and cheapest materials in construction. And corrugated sheeting is made from it: by cold rolling and subsequent decorative and protective polymer coating.

Profiling can create a wavy, U-shaped or trapezoidal shape for such a sheet. But this necessary measure, and not just an aesthetic effect - this increases the strength and rigidity of the sheet by at least three times. That is why such a simple and inexpensive sheet in composition turns out to be quite a decent roofing material.

The second important point is that the corrugated sheeting consists of steel and does not give off any strong unpleasant odors, like some of the modern roofing coverings. Easy to cut, easy to install. In addition, it can be laid on any roof, the angle of inclination of which is not less than 8°, and the slope does not exceed 20 meters.

And one of the most important advantages of corrugated sheeting as a roofing covering is its weight. After all, working on a steep roof with heavy, albeit more beautiful, material is difficult and unsafe.

Have you decided on just such a roof? Then all that remains is to purchase high-quality, durable sheets with the necessary characteristics!

Types of modern corrugated sheets

The first thing you need to pay attention to is the type of coating, wave height and width of the corrugated sheet. Not every type of roofing is suitable, this is important!

Marking

The height of the corrugation for roofing corrugated sheets is permissible in the range of 10-114 mm. Just based on the height of the corrugation and the thickness of the sheet, in the modern construction market you can find three types of corrugated sheets:

• Facade class C, which is used for the construction of fences and wall decoration.
• Load-bearing class H, which is used for cladding walls and partitions.
• Roofing, which is used to finish roofs. This is the NS class.

More details in the picture:

On the modern market, the most common marking sheets are H45, H75 and H114. On sale you will find sheets C10, C20, C35. CH class corrugated sheeting is called load-bearing or wall, because... it is already used for the construction of roofs and solid fences. Its profile height is from 35 to 44 mm.

This diagram will help you figure it out:

If you do not find the GOST inscription at the end of the marking, it means that this batch was manufactured according to a different standard. In addition to all this, markings A and B indicate the presence of painted sides, and R indicates the presence of a capillary groove.

Manufacturing technology

There are different types of corrugated sheeting according to manufacturing technology:

1. Rolled products with aluminum-silicon coating.
2. Rolled thin sheets with aluminum-zinc coating.
3. Thin-sheet aluminized rolled products.
4. Thin sheet metal with zinc coating.

For example, AC is thin-sheet rolled products with an aluminum-zinc coating, and AK is the same technology, but with an aluminum-silicon coating.

Here interesting video about the production itself:

Please note that some models of corrugated sheets and more expensive metal tiles can be produced on the same machine, but will still differ in their qualities. It’s just that some models of corrugated sheets are universal. This, for example, can be called corrugated sheeting S-20: PS-20 is wall sheeting, and PK-20 is roofing sheeting. Just the same roll to make wall option and roofing is laid different sides. And there is only one rental. In other words, this is the same profile, but with a reverse side.

Coating quality

Corrugated sheeting today is available in two types:

1. Made of thick galvanized steel, 0.5-07 cm.
2. Made of thinner galvanized steel (0.5 cm) with a modern polymer coating.

And the quality of the polymer coating on corrugated sheets can also vary. The following are considered suitable for roofing:

• Polyester. Excellent decorative qualities, but poor protection against mechanical damage. Abrasion and peeling are its main problem.
• Pural. It’s just as bad in terms of wear resistance as polyester, but it’s much cheaper.
• PVDT, or polyvinyl difluorine. Excellent qualities strength and light resistance, rich decorative range. The cost is higher.

For corrugated sheets, both sides of the sheet are painted, one of the sides or none:

Price formation

The total price of roofing corrugated sheets depends on the following parameters of the sheets:

• Availability of zinc coating.
• Availability of color.
• Presence of protective painting.
• Length and width of the sheet.
• Sheet thickness.
• Corrugation height.
• Purpose of corrugated sheets.

What a wide choice you have!

What kind of corrugated sheeting can be used to cover the roof?

And now about what types of corrugated sheeting specifically for roofing there are today, and why one of them is better than the other.

There is a GOST regarding such coatings: “Profiles of construction bent steel sheets with trapezoidal corrugations.” It states that the thickness of the sheets should be between 0.4 and 0.6 cm.

In practice, most often a profile sheet from 18 to 35 mm thick is used to finish the roof. Traditionally, this is the NS brand, which has the most optimal rigidity, rib height and sheet thickness.

In addition to the main options, as roofing material You can also use the following sheets:

• Galvanized profile without polymer coating. Costs 40% less, suitable for roof decking outbuildings and a garage.
• Corrugated metal sheeting, also uncoated.
• Expensive and durable corrugated sheeting made of non-ferrous metals: copper or aluminum. The rarest option.

And even a kind of exotic. So, special corrugated sheeting for the roof can be:

1. Made by cold rolling.
2. Bent to the desired shape.
3. Perforated.
4. With spectacular textured wood or stone embossing.

You can give preference to any option you like, as long as one important requirement is met: all products must have a quality certificate.

Format of issued sheets

So, the design and shape of the corrugated sheet have been chosen, all that remains is to build the sheathing and decide on the dimensions of future sheets:

And at this stage, let's understand a little terminology. So, “waves” go across the slope, and “rows” along, and the distance between the rows is called the corrugated pitch. But “modules” are sheets that consist strictly of six waves and have a pitch of 35 cm. Now you understand what single-module sheets on the market are, three-module, six-module and ten-module, which are also called “warehouse” in another way. Those. standard.

Of course, the roof of your house is not the roof of a warehouse according to Soviet drawings, and with such “modules” it will not be possible to lay it out to scratch, without leftovers and the need for cutting. That's why roofing sheets today it is fashionable to order by custom sizes, although, of course, you will have to pay extra for this. But the risk of corrosion on the roofing will be significantly reduced. In everyday life of roofers there is also such a term as “bottom cut”. This is the lowest 50 mm of the sheet, which can be measured from the cut line to the crest of the wave. This value is 50 mm for standard stock sheets and up to 300 mm for specially ordered ones.

By the way, if the slope on your roof exceeds 6 meters in length, then to prevent the corrugated sheet from bending, it is better to order material that is half as long. For example, 3 meters, taking into account the overlap that the corrugated sheet has - 100-150 mm. Every second wave will need to be fastened under a transverse pattern

What to do with the sheets after purchase?

The first step is to transport it correctly:

Yes, and you also need to store purchased corrugated sheets correctly. It is not uncommon for roofing material to be delivered to a construction site either ahead of schedule or before the rainy season. Then it is better to find a flat place and fold the sheets so that between them there are bars with a cross-section of 20 cm. Each stack contains no more than 10 sheets! You don’t want this expensive material to deform and become unusable even before installation begins, do you? Therefore, approach this issue responsibly.

If it turns out that some sheets still need to be trimmed, don’t worry! You can easily handle this on your own. For this purpose, use ordinary metal scissors (or a hacksaw as an option) to cut along the length, and to form bevels, use a power saw with special teeth made of hard alloys. But grinding machines with wheels made of abrasive materials will lead to corrosion of metal sheets.

How to avoid running into fake corrugated sheets?

So we figured out which corrugated sheeting to choose for the roof of your house. Agree that installing a roof is an extremely important stage in the construction of the entire house. Walls and even foundations are much easier to repair than roofs - all because of the height. Therefore, when purchasing a metal profile, be sure to find out what raw materials these sheets were made from. You don’t really want to see this on your own roof in a year, do you?

First call: price

The most dangerous period in terms of counterfeits in the construction market is summer. It is at this time that everything is built - weather and air temperature permit. It is quite difficult for large manufacturers to plan sales volumes and it is not uncommon for corrugated sheets to be at their peak. construction work no longer in stock. That’s when small companies engaged in handicraft production come into play. They buy wherever they find the cheapest raw materials - Chinese, Indian or domestic, for a long time stored in improper conditions and almost decomposed. Sheets are produced on home-made simple machines, which are then sold on the market as “quality material”, with a slight difference in price. Most often, the buyer is offered a 10-20% discount on the cost of “the same corrugated sheet as a large manufacturer, why overpay for the brand?”

Therefore, the first warning sign is the price. And it is formed depending on the purchase price of the raw materials - one ton of galvanized steel roll. Expensive corrugated sheeting is made from expensive raw materials, and cheap corrugated sheets are made from cheap ones. And then the price depends on how thick the sheets themselves will be. That’s why, if a manufacturer offers you relatively inexpensive corrugated sheeting of normal thickness and with supposedly high technical characteristics, only cheap raw materials, Chinese or Indian, but not European, could be used. You can check your guesses at the office of the trading company by asking to see certificates and taking samples of the material.

But the buyer may not even know that the raw materials themselves cost the scammers literally pennies - for him, sometimes the price set is not a penny at all...

Second call: promises

The second alarm bell is promises to fulfill the order too quickly, i.e. make sheets of the required size. Yes, between any large manufacturer and buyer there are always intermediaries - at least two. And it is from them that you order the goods. But any normal company will not deliver it to you before 10 days, but on the market they will promise it much faster, after which they will miss the deadline and explain their behavior as a breakdown of some line.

Third call: fast delivery

Even more often, the buyer is forced to purchase ready-made sheets, only at a price much higher than the standard ones. In fact, a seller of quality material who cooperates with a real manufacturer will immediately say that time is needed and will not impose something that is already lying around.

But the biggest deception is that fake corrugated sheeting is also thinner than the declared parameters. After all, 99% do not have a micrometer and certainly do not know how to use it, and as a result, the roof of their house is covered with a material much thinner than is required by the rules. The deviation that is acceptable is only 0.05 cm, i.e. 5 cm, but no more. If you run into scammers, buy a micrometer and get ready for shock.

But we hope that our tips in choosing corrugated roofing will help you avoid all these annoying mistakes, and your roof will be the brightest and highest quality in the area!

Most modern public and residential buildings are covered with metal roofing materials. These include metal tiles and corrugated sheets. They are made using similar technology, so the difference is only in the shape of the pattern. If the first one is made in the form of tiles, then the second one has the form of longitudinal ridges imitating slate. To better understand which corrugated sheeting to choose for the roof, you need to study its varieties and understand the meaning of the markings.

Classification of profiled roofing sheets

Profiled roofing sheets are produced by cold rolling of metal sheets. The product has a comb surface. This gives rigidity and allows water to flow through the grooves formed by the ridges. The ridges can have different cross-sections geometric shape, starting from a triangle and ending with a trapezoid. On mechanical properties This does not affect anything, but it creates variety when choosing the material. Therefore, it does not matter which corrugated sheeting to choose for the roof: with triangular or rectangular ridges. It's just a matter of consumer taste.

Types of protective coatings

Profiled sheet after rolling mill enters the workshop where it is produced protective treatment galvanic method. There are two types of protection:

• zinc coating involves the use of zinc salts as a working substance. As a result of electrolysis, metallic zinc settles on the sheet, covering it with a continuous layer. This metal reacts poorly with oxygen, which guarantees excellent protection of steel from corrosion. The more zinc consumed, the greater the protection;
• aluminum-zinc coating is produced using the same technology, only aluminum salts are added to zinc salts. They are cheaper, so this coverage is more budget-friendly. At the same time, the degree of protection decreases, which makes it necessary to make another decorative coating from polymer materials and dyes.

The top colored coating has more of a decorative function, as it is not very durable. However, it can somewhat enhance the basic protection.

Types of decorative coatings

Decorative coating also comes in several types:

• glossy polyester - the simplest and cheap option coverings. During installation and operation, it quickly loses its appearance due to scratches and chips;
• matte polyester has greater reliability and resistance to mechanical stress. Its structure is similar to velvet, and its thickness is greater, which allows it to retain color longer and avoid glare;
• pural is a polyurethane coating with the addition of polyamide, having a thickness of 50 microns. Has high reliability, immunity to low air temperatures and ultraviolet rays. Pural is best suited for application to roofing sheets;
• plastisol is the most reliable of all types of coatings. The thickness of the polyvinyl chloride layer is 200 microns. This polymer coating has relief embossing and dashed notches. It is intended for use in harsh climatic zones, is resistant to mechanical stress, and is very durable.

All these coatings are applied to a layer of paint, which can be of various colors. The name of the color may vary from manufacturer to manufacturer, but the most common colors are shades of red, brown, blue and green. You can find bright orange, yellow and purple versions of corrugated sheets. Each owner decides which corrugated sheeting to choose for the roof of his house according to his color preferences.

Types of corrugated sheets by purpose

Based on the area of ​​application of the material, the following types of profiled sheets can be distinguished:

Roofing (PC) is used only for roofing. It has a profile height of over 20mm and a wave height of over 44mm.

Bearing (H) is used in the construction of frames of various stalls and trade pavilions, sandwich panels and ceilings. It has a wave height of 35 mm.

Wall and load-bearing (NS) has a universal purpose. Load-bearing structures are made from it and walls are lined. The wave has an even greater height (35?44 mm.).

Wall (C) is used only as facing material for walls. Its profile is from 6 to 35 mm in height.

All types of corrugated sheets are cut into standard sheets length from 1.5 to 12 m. At the same time, at the request of the customer, manufacturers can cut sheets of any required length.

How to read corrugated sheet markings

As an example, you can take the marking: NS35-0.5-750-12000. It’s easy to decipher: NS35 means that it is a wall load-bearing sheet 35 mm thick. The second number is the sheet thickness - 0.5 mm, the third - width 750 mm, and the fourth - length 12000 mm. The permissible loads on the profiled sheet depend on these characteristics. There is a special load table for various types of corrugated sheets. The permissible load depends on the thickness of the sheet, the distance between the ridges, their height and varies from 50 to 960 kg/m?.

Taking into account that sheets marked PC are used for roof construction, it is necessary to decide which corrugated sheeting to choose for the roof.

Which corrugated sheet to choose for the roof

Before you start choosing roofing material, you need to understand the following important things that you should pay attention to when purchasing:

• It is preferable to buy a product marked “State Standard” (GOST) than “ Specifications"(TU), since government requirements always higher than the standards of the manufacturer itself;
• when calculating the roof area, you need to take into account 200 mm tolerances;
• You cannot buy too cheap non-galvanized sheets, which will quickly rust and collapse under the influence of unfavorable environmental conditions.

So which roofing sheeting should you choose from the options listed? Experts advise making a choice taking into account the region of residence, since climatic conditions are decisive in the choice.

Among the main options for corrugated sheeting that can be used to cover a roof are:

PK20 - used in roofing work in moderate rainfall zones. It is necessary to install lathing in increments of no more than 80 cm. The sheet has a working width of 110 cm.

Although C21 is a wall profile, it can be used for roofing work in the temperate zone. The sheathing pitch is also no more than 80 cm.

NS-35, 44 are used in more severe climatic conditions, as they have a higher permissible load-bearing load.

In addition, N-57, 750 (900), N-60, 75 are used in roofing work, depending on the required load-bearing load.

When the question arises of which corrugated sheeting to choose for the roof, you should not discount such parameters as color and decorative properties. After all, a roof that is in harmony in color and texture with other buildings on the site looks much more attractive and creates the impression of integrity of the entire architectural environment.

Features of installing corrugated sheets on different types of roofs

The general rules for installing corrugated sheeting on the roof are as follows:

• the sheathing is made continuous or in steps, but no more than is prescribed for specific brand leaf;
• A film or roll vapor barrier is laid on the sheathing;
• sheets are attached with special roofing screws with rubber gaskets along the waves.

For various types roof rules are slightly different. So, flat roofs begin to close from the right edge. Installation of hip-type roofs is carried out simultaneously from both sides, and begins from the very high place stingray

If you decide correctly which roofing sheeting to choose and lay it in accordance with the requirements, you will get a beautiful and reliable roof.

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Among the numerous roofing coverings, corrugated sheeting is the most popular. If just recently it was somewhat ahead of metal and bitumen shingles, now, thanks to the most successful combination of quality and cost, corrugated sheets have confidently come out on top.

Due to the fact that the technology for producing roofing material is very simple, corrugated sheeting is produced by a huge number of companies, both very well-known and very small. Not all of them are honest; there are also those who violate existing regulations. To make the right choice of corrugated sheeting, you should know what criteria are regulated by state standards.

This is one of the most important criteria choosing corrugated sheeting for the roof. If his profile responds regulations GOST 24045-94, then you can be sure that the roof will withstand all design loads without problems, its service life will not be less than planned.

GOST 24045-94. Bent steel sheet profiles with trapezoidal corrugations for construction. Technical conditions.

By what parameters are the technical conditions of the sheet profile controlled?

Assortment

The state standard classifies profiled sheets according to several parameters. Consumers are advised to buy profiled roof sheets only if their characteristics fully meet existing conditions operation of the building and its architectural features.

Purpose

Depending on the purpose, the sheets can be used for roofing, for decking and fencing, or only for wall fencing.

The first ones are marked with the letter N, are distinguished by the highest flexural strength. They have thick sheet steel, they have high profile, which increases mechanical bending strength, alloy steel is also made, which is characterized by high ductility values ​​and makes it possible to stretch profiles with complex geometries without microcracks and loss of original properties.

Sheets for flooring and fencing are designated by the letters NS, are used both for covering roofs and for wall fences. If you buy them for a roof, you need to know that such material has insufficient strength; to increase the reliability of the roof, you need to reduce the pitch rafter system.

Wall profiled sheets are designated by the letter C, they are recommended to be used during the construction of fences. They have a low profile and small thickness.

Some developers, in order to save money Money They are trying to use such profiles for roofs, but professionals do not recommend doing so. The point is that in this case you need to do continuous sheathing from OSB, which is very expensive and ineffective material point vision. All savings are eliminated, but the risks of critical wetting of the wooden elements of the roof rafter system increase. Wet wooden elements create many problems during the operation of the building.

Material of manufacture

Corrugated sheets must be made from thin-sheet galvanized steel GOST 14918 with zinc coating, having a protective coating of aluminum zinc TU 14-11-247-88, rolled metal with aluminum-silicon and electrolytic zinc coating. Each type of anti-corrosion coating has its own requirements for the thickness and quality of layers; it is these values ​​that affect the service life of a metal profile roof.

Prices for corrugated sheets

Corrugated sheet

Video - Raw materials for the production of corrugated sheets

Technical data of decorative coating

Depending on the type of profiled sheets, they can be without decorative surface coating or with such a coating. paints and varnishes, coating technology and technical specifications must comply with the provisions of GOST 30246.

Rolled thin sheets with protective and decorative paint coating for building structures. Technical conditions. GOST 30246-94.

If the sheet is made of high-quality materials that meet all the requirements of the current technical standards, then it is marked.

For example, N57-750-0.8 AD ML-1202/ML-1203 GOST 24045-94.

The legend indicates that this is a roofing sheet with a profile height of 57 mm, a width of 750 mm and a metal thickness of 0.8 mm.

Keep in mind that the indicated metal thickness is given without protective and corrosion coatings. For decorative and additional anti-corrosion coating, ML-1202 enamel was used on surface C and ML-1203 enamel on surface D. The metal profile is made of rolled steel with an aluminum-zinc anti-corrosion coating. Products meet technical requirements GOST 24045-94. Each batch of goods must have an official document from the manufacturer with the same marking.

Technical requirements

The metal profile must meet existing classes zinc coating in terms of thickness and uniformity of the layer, type of crystallization and mass per square meter. If imported rolled steel is used for the manufacture of coatings, then its quality indicators must be no lower than domestic standards. Special attention This position should be taken into account when purchasing Chinese or Turkish rolled products. Some domestic manufacturers also cannot comply with all provisions of the standard and sell substandard products. The thickness, composition and technology of applying paint and varnish coatings are separately controlled.

Important. Unfortunately, unscrupulous sellers take advantage of the ignorance of buyers and very often sell low-quality sheets at inflated prices. Developers cannot independently check the quality of galvanizing, measure the thickness of the paint coating and find out the composition of dyes. And it is very often impossible to find out actual data, there are no official documents of compliance with technical requirements, you have to rely on the honesty of sellers.

What determines the durability and reliability of a corrugated roofing?

They have loads of different intensity and nature, the better they resist them, the more durable and reliable the coating.

Parameter	Description
	Professionals recommend not buying sheets less than 0.5 mm thick for roofing. The fact is that roofing sheets will always have areas that are completely devoid of protective anti-corrosion coatings. These are holes under screws, places where they are cut, mechanical damage during installation, etc. These areas are small in area, but can cause a lot of trouble. The thicker the metal, the longer it can resist the appearance of through corrosion. Of course, the mechanical bending strength indicators directly depend on the thickness of the sheet, but this parameter can be adjusted in other, cheaper ways. The fact is that in the price structure for metal profiles, the cost of steel is approximately 65%.
	Profiles roll onto flat sheets while passing through special machine shafts. For roofing coverings, the profile height must be at least 25 mm; the optimal range is considered to be 40–50 mm. The higher the profile, the greater the ductility of the steel. Otherwise, critical internal stresses inevitably appear in stretching areas, and the sheet thickness noticeably decreases. State standards It is prescribed to use only high-quality alloy steels of special grades for the manufacture of profiled sheets. This is a rather expensive metal, which significantly increases the cost of roofing production.
	It is due to this parameter that the bending resistance of the corrugated sheet increases. Accordingly, it is possible to increase the distance between the sheathing slats and thereby slightly reduce estimated cost roofs. But experienced roofers do not advise increasing the pitch of the sheathing too much; it would be better to have a safety margin. The roof should not be used to its maximum permissible loads. Most often, a profile with a height of 20 mm is purchased for roofs; this is at the limit of possibilities. Roofing with a profile height of 30–40 mm is much more reliable. As for geometry, then modern views corrugated sheets have additional grooves for condensate drainage. Additional grooves do not have a noticeable effect on the performance characteristics; due to this technology, companies have the opportunity to increase the cost of their products, while there is no need to make any investments in production technology.
	The weight of a square meter of profile, depending on the thickness of the sheet, ranges from 5–7 kg. For the roof with total area 100 m2 the difference can be approximately 200 kg. Such loads are considered negligible and are not taken into account when calculating the rafter system.

It must be borne in mind that all of the listed characteristics can deteriorate significantly if the installation technology is violated. Even the most expensive profiled sheets will have leaks; they do not appear due to physical wear or mechanical damage. The cause of the problems is incorrect overlap, errors during fixation of sheets, careless attitude towards building regulations and rules.

Characteristics of decorative coatings

Modern paints have a noticeable impact not only on design, but also on operational properties - they protect the zinc layer from oxidation processes and scratches. The highest quality finishing coatings can increase the service life of roofs by approximately 20–25%. What types of paints are used for coating external surfaces profiled sheets?

Polyester

The most popular protective coating among users. The reason is good performance at a relatively low price. The surface can be matte or glossy. Suitable for all climate zones, not afraid of heating and low temperatures. Does not fade under influence sun rays. The coating is plastic, not afraid of bending, and has excellent adhesion to metal surfaces. The thickness of the paint layer is at least 35 microns. Disadvantage - low mechanical strength, easily scratched, the lower layers of the protective anti-corrosion coating are exposed.

Pural

The paint thickness is 50 microns, the composition is modified with polyamide in order to increase physical strength. Retains original characteristics when heated to a temperature of +120°C. Disadvantage: sharp bends are not recommended. Microcracks may appear in these places, and over time they tend to expand. It is used quite often, and is somewhat more expensive than polyester.

Plastisol

The thickness of the coating, depending on the type of metal profile, can be 200 microns, due to this the surface is embossed. The coating is very resistant to mechanical damage and has special additives that protect against the negative effects of UV rays.

PVDF

The most modern, high quality and expensive coverage. It is rarely used for metal profiles due to its high cost. Coating thickness up to 30 microns. The composition includes 20% acrylic and 80% polyvinyl chloride. Practically does not respond to ultraviolet radiation. Well tolerated high temperatures heating and cooling. It is characterized by the highest mechanical strength and has good ductility.

Color influence

When choosing the type of paint and varnish coatings, you need to pay attention to their color. It must correspond to the architectural style of the building and look harmonious with nearby buildings. Depending on the country of location of the manufacturer, the color range of roofing coverings can be systematized according to RR, RAL and HTS standards. We most often use the RAL system; it has the easiest to remember designation and takes into account a large number of colors.

Each coating is designated by a four-digit code; in total, there are more than a thousand options in the palette, but in practice, profiled sheets have about ten varieties. The rest are almost never used; in residential construction there is no need to use such a wide variety of color solutions.

1. Appointment of professional sheets. The ideal option is to choose a material with the letter H; these sheets have the highest bending strength.

   

   If you want to buy universal roofs type NS, then the angle of inclination of the slope cannot be less than 35°. Otherwise, there is a possibility of critical deflections or fractures. Risks increase if the rafter system and sheathing do not take into account wind and snow loads, the design is not resistant to dynamic and static loads.

   

2. Profile height and sheet thickness. The smaller the angle of inclination of the slopes, the thicker the sheet metal should be and the higher its profile. On pitched roofs with an inclination angle of ≈20°, metal thickness of at least 0.5 mm, profile height of more than 30 mm.

   

   You need to know that if the thickness of the metal has a great influence on the price of the roof, then the height of the profile increases the cost slightly, but the strength increases noticeably. It is recommended to test the sheet before installation and estimate its weight. But such a quality check can only be done by professionals; they have experience in comparing different types of profiled sheets.

3. Manufacturers' names. You should not pay attention to the warranty; in practice, there have not yet been recorded cases of filing lawsuits against manufacturers due to leaks in the roof. Companies will always be able to find any violations during installation, point out incorrect choice type of sheet depending on the climatic conditions of the location of the structure, etc. In addition, most of the stores that sold building materials will no longer exist in 20–30 years, and there will be no one to make material claims against.

   

Visual determination of the best corrugated roofing

It is advisable to go to the store with an experienced, trusted builder; he often encounters various types of corrugated sheets, which allows him to quickly distinguish counterfeit goods from high-quality ones.

What details should you pay attention to?

1. WITH reverse side The sheet must have a designation of the profile type. These markings are not applied by sheet steel suppliers, but by coating manufacturers. Bending machines have a special apparatus for marking with durable paints. Lack of symbols indicates obsolete production lines or reluctance to indicate product data and contact details of the manufacturer. In both cases, this should alert potential buyers.

   

2. The surface of the sheets should be inspected. They may have a special protective film or be without it. Many consumers, in order to save money, order sheets without a protective film.

   

   If there are deep scratches, dents, dirt, etc. on the surface, this indicates low production discipline at the enterprise, unprofessional employees, faulty bending lines and violations of the recommended manufacturing technology. Damage may occur during production, storage and transportation.

   

   Particular attention should be paid to the presence of foreign inclusions on the surface of the paintwork. It is strictly not recommended to use a metal profile with such defects. Poor quality finishing coat indicates that the thin sheets were prepared at unlicensed enterprises, but in China or Turkey. European goods never have the defects described above.

3. Try bending the profile with your fingers. The appearance of a bend line even at large radii indicates the low quality of the metal. The profile is made not from expensive alloy steels, but from the cheapest structural steels. Their physical and operational characteristics are insufficient for use as roofing materials.

   

4. Price. This parameter should be treated very carefully. If previously low-quality profiled sheets were sold only at very low prices, now there is no such obvious difference. Unscrupulous sellers know that domestic buyers automatically consider expensive profiled sheets to be of high quality and specially install high prices. If the product is expensive, then all documents on quality compliance, designations, addresses and company names are necessarily present, this is additional advertising for responsible manufacturers, they always indicate their products.

   

Important. Always try to compare the color of the protected areas of the sheets with the exposed ones. If there is a big difference in color shades, then this is direct evidence of low quality.

conclusions

It is best to buy goods from manufacturers, and not from intermediaries; they have all the accompanying documents that allow you to objectively assess the actual quality of the roof. Today this is no problem. There is a convenient delivery system, it is possible not only to choose suitable option metal profile, but also get professional advice on use.

Most serious manufacturers provide . For this purpose, special departments with professional employees are created. They have great practical experience to solve various problems that arise during the production of work. No theoretical articles can provide for all situations that arise in practice. Experienced roofers know how to independently take the only right decisions in every specific case. Advice from such experts helps developers avoid making annoying mistakes.

When choosing a coating, you should never be guided only by price. The roof is a very important architectural element of any building; not only durability, but also comfort of living and safety of operation depend on its reliability. It is not recommended to build cheap roof, repair work will always cost much more than saving on the quality of building materials.

Prices for metal tiles

Metal tiles

If you have already chosen corrugated sheets, it’s time to start doing the calculations. It is important to correctly calculate the amount of corrugated sheeting for the roof so that you do not have to buy additional material or there is not too much left over. You can find out how to do calculations. And find out required amount materials for sheathing easily using our construction calculator.

Conducted among the portal participants, the top three among roofing coverings in demand in private housing construction is closed by corrugated sheeting. It is inferior to metal and flexible tiles, but surpasses other roofing materials in popularity. And if for some the laconic profile is a minus, then others choose this coating precisely because of the visual component. In any case, corrugated sheeting on roofs is a fairly common occurrence; it would be a good idea to consider this material in more detail.

• What is corrugated sheeting?
• Varieties of profiled sheets.
• How to choose corrugated roofing.

What is corrugated sheeting?

Profiled sheet, also known as corrugated sheet or corrugated sheet (less often metal profile), sheet material, made of galvanized steel by cold rolling (profiling). Modern corrugated sheeting available with profiles different types, but trapezoidal has become more widespread. And although the profile significantly increases the decorative properties of the material, first of all it gives it the necessary characteristics - it increases strength, rigidity, load-bearing and throughput.

To extend the service life of the metal, after profiling, polymer coatings are applied to the surface - they not only protect the sheet from external influences, but also significantly increase the decorative effect. Today, corrugated sheets can be bought in almost any color, both with a matte and glossy surface. As for polymers, the same ones used as in the production of metal tiles are used - polyester and polyurethane derivatives.

The service life of the profiled sheet primarily depends on the parameters of the steel base and the zinc layer, but the protective and decorative coating also makes its contribution. Without a polymer film, zinc immediately reacts with environment. This does not mean that it will be “washed away” in a few years, but such a roof will last less. However, no layer of polymer guarantees a profiled sheet for many years if the base is too thin steel and insufficient layer of zinc. As with metal tiles, the production cycle usually includes profiling and coating, and the steel is purchased from domestic or foreign companies. Accordingly, the quality of the final product will depend on the quality of the raw materials.

Types of profiled sheets

By and large, today corrugated sheets differ from metal tiles only in the profile shape, since they are made from the same galvanized steel with polymer coatings. And if the disadvantages of corrugated sheets are often considered to be insufficient decorativeness, then one of its main advantages is considered to be “tolerance” to the sheathing. Unlike MCH, the step between elements can be much larger, and it does not have to be strictly observed. This not only allows you to save on lumber, but also simplifies preparatory process. As for the maximum permissible slope angle, metal tiles and corrugated sheets are similar in this indicator.

Pil18

It is preferable to use profiled sheets on the roofs of buildings with an inclination angle of 20 degrees. Allowed for industrial facilities with a self-supporting profile minimum slope for corrugated roofing, at least 8 degrees, and for residential buildings - from 10 degrees.

Initially, corrugated sheeting was not intended for use as a roofing material and was produced in three types:

• C – wall, for cladding facades, gables and fences;

• N – load-bearing, with increased load-bearing capacity, for pouring lightweight monolithic floors;

• NS – universal.

However, both wall and load-bearing and universal corrugated sheeting were used to cover roof wings back in the USSR - but if at that time these were mainly hangars, warehouses and others industrial facilities, then today these are not only various sheds and outbuildings, but also private houses. The possibility of using S, N or NS profiled sheets on the roof depends on the height and shape of the ridge - with equal base thickness, it is these indicators that provide the sheets with sufficient load-bearing and throughput capacity. In order for a wall profile to be used as a roofing profile, the height of the ridge must be from 21 mm; a universal one is also in demand, since it has this figure of 35 mm.

As for the load-bearing corrugated sheet, it is also used for roofs, but this is impractical, even in order to save wood.

The owner of the sofa

In general, all profiles above 45 (C 45) are meaningless for use on the roof purely economically. It is all the more pointless to use profiles of group H, since an attempt to use their high load-bearing capacity in order to save on the sheathing of the rafter system results in either its (the rafter system) being made heavier or subsequent collapse.

Demand creates supply, and today manufacturers offer specific roofing applications profiled sheet, which not only has a special profile shape, but also a groove for condensate drainage, due to which the height of the ridge can be lower than 21 mm. Such sheets are marked with the letters R, but some brands also add an abbreviation (MP, SIS). However, the downside of a low profile is the dependence on the base - due to the low rigidity, such sheets require frequent and sometimes continuous lathing.

What to look for when choosing corrugated roofing

The advice to “look at the root” is also relevant in this situation, only the core is the root, namely the galvanized steel base of the corrugated sheet. The thickness of the metal, excluding the polymer layer, must be at least 0.5 mm, and the zinc coating must be at least class two (140 g/m²), but the higher this figure, the better. If the rigidity of the corrugated sheet depends on the height of the profile, then its resistance to corrosion depends on the thickness of the zinc coating. Typically, resistance to fading is also important to consumers.

Oleg_Sova

The time has come to purchase metal profiles and all additional materials. Definitely profile C 21, but I can’t decide between the coatings:

• polyester gloss;
• matte polyester.

I'm most interested in anti-corrosion resistance and less fading.

Pil18

Anti-corrosion resistance will be higher for metal with a high zinc content - 275 g/m². In terms of color fastness, matte coatings are better when it comes to polyester. But polyurethane coatings are better than polyester (polyester) coatings.