Technology for installing a roof made of sandwich panels: stages of work. How to make a roof slope from sandwich panels? Installation of roof panels with steep slopes

Sandwich panels are a modern version of roofing material. Installation of roofing in the form of multilayer panels is simple, since the material weighs little. Light weight is both an advantage and a disadvantage, since strong gusts of wind can tear off the coating.

In three-layer roofing panels, the outer layers are profiled metal (thickness 0.5-0.7 mm), and inside there is a heat insulator (fiberglass, mineral wool, polystyrene foam or polyurethane foam). All layers of a sandwich panel are a single product; the layers are joined using glue or pressing.

Advantages of roofing sandwich panels:

• Good noise and heat insulation;
• Original appearance;
• Fire resistance;
• Service life more than twenty-five years;
• Versatility - there are elements of different sizes.

Installation features

The roof that is planned to be covered with sandwich panels must have the correct slope. The slope of the roof is prescribed in SNiPs; improper roof design reduces the service life of this roofing by almost half.

• If the roof has windows or skylights, the slope should be greater. In this case, calculations are carried out on an individual basis.

Problems when choosing the wrong slope of roof slopes:

• Rapid wear of the material, deterioration of operational parameters;
• The occurrence of water stagnation;
• Poor waterproofing, roof leaks;
• Loss of aesthetic appeal.

Sandwich panels are often used in the construction of residential and industrial buildings. This is an inexpensive building material, from which walls and roofs are mainly built.

Structure

Sandwich panel is a sheet consisting of the following layers:

• external covering on both sides (galvanized steel, polyester, oriented strand board or plasterboard);
• insulation (mineral wool, polyurethane foam, fiberglass or polystyrene foam).

Advantages of sandwich panels

The widespread use of this building material for roofing is explained by the following advantages:

• thermal insulation at a high level;
• low level of flammability;
• low cost;
• high level of sound insulation;
• no need for complex construction equipment for installation;
• reduced load on supporting structures due to low weight;
• a wide range of shades, so there is no need for additional finishing;
• high resistance to negative environmental influences (humidity, microorganisms, chemicals, temperature changes).

Construction of the roof

In order for a roof made of sandwich panels to be reliable and of high quality, the following rules must be taken into account:

• The minimum possible roof slope angle is 50. This is the lowest point; exceeding it is permissible here.
• Only solid panels without joints, windows or other elements that would interfere with their integrity are suitable for installation.

Since 50 is the minimum mark, other criteria are needed to determine the angle that is suitable for this particular roof. An important one is the climate of the region in which the building is being erected. If the region is characterized by frequent and heavy rainfall, then it is necessary to provide a slope that would maximize the removal of moisture from the roof. The optimal indicator here is 400. This way, water will not stagnate at the joints, and in winter this is especially important, since snowdrifts and ice destroy the roof, widen the cracks and lead to the risk of collapse if snow masses have accumulated in large quantities.

If the climate is quite arid, then the slope is allowed from 70 to 250.

You should remember this ratio: the steeper the roof is erected, the greater the consumption of building materials will be required. If the roof is quite flat (5-7 degrees) there is no need for additional fasteners to secure the sandwich panels to a supporting structure made of metal, reinforced concrete or wood. However, if this low level is exceeded, additional connecting fasteners are indispensable.

Formulas for calculation

Slope is the angle of inclination of the roof surface relative to the horizon. The greater the angle, the greater the steepness of the roof. The slope is expressed either as a percentage or in degrees. For example, 40 is equivalent to 7%.

Necessary equipment

When constructing a roof from sandwich panels, it is necessary to constantly trim them using electric shears, a stationary machine or a fine-toothed saw. A grinder or hot cutting devices are not recommended here, since when heated, the cut lines are deformed and bent, the protective coating is broken and corrosion appears.

To transport the panels to the roof, vacuum or mechanical grips are used, which do not damage the surface or compromise the integrity of the slabs. Before installing the grips, a protective film is glued in the required places. The panels are secured using long stainless steel self-tapping screws for sandwich panels, supplemented with sealing gaskets and washers. The length of the fasteners must correspond to the thickness of the slabs and frame.

To prepare for work, you need to first calculate how many fasteners you will need. Their number is influenced by the following factors:

• Wind load. This factor depends on the height of the building, its location and the angle of the roof.
• Type of construction (closed or open).
• Fastening area. The outer panels experience more wind load than the slabs located in the center.
• Characteristics of fasteners (load-bearing capacity).

Based on all these factors, the required number of hardware is calculated, and it is important that the resulting figure corresponds to the proper SNiP.

Secrets of proper styling

When constructing a roof from sandwich panels, it is important to maintain their integrity, otherwise the result of the work will be unsatisfactory. The following recommendations will help you complete the entire process correctly:

• When cutting slabs, abrasive or hot cutting is not allowed, as it damages the integrity of the protective layer.
• Sandwich panels are covered with protective films on both sides. It must be removed from the lower part immediately before the installation is carried out, not earlier. The top film must be removed upon completion of all work so as not to stain or deform the surface.
• If shavings appear during the cutting process of metal, they must be removed immediately so that they do not linger on the surface of the slab.
• When performing installation work, workers on the roof must wear shoes with soft soles only.
• If the slabs are stored outdoors while awaiting construction, care must be taken to protect them from aggressive weather influences. It is recommended to stack the material on a flat and dry area.
• The weather for installation should be dry, without precipitation or strong wind. The maximum permissible wind speed is 9 m/s. The minimum ambient temperature is +40C.
• Good lighting is necessary for the installation process.

Preliminary inspection

Before laying a sandwich panel on the roof, you need to carefully inspect the roof structure so that it fully complies with the project; the correct installation of the slabs depends on this. If defects and errors are found, they must be eliminated before installing the sandwich panels.

Laying process

Sandwich panels are mounted transversely to purlins located parallel to the eaves. To improve the load-bearing capacity of the roof, you can reduce the installation step of the purlins. This is relevant when constructing a roof with a slight slope, if the region is characterized by heavy snowfalls.

Before erecting the slabs, a layer of waterproofing and insulation is laid (mineral wool is often used for this purpose). The purlins and supports are checked. All deposits, including mold and rust, must be removed. Preliminary preparation of supports depends on what material they are made of.

• Wooden structures are cleaned of mold and mildew, and cracks on their surface are repaired. A protective layer is applied to prevent fire and mold.
• Metal elements are coated with an anti-corrosion agent.

First, slabs are laid, the length of which does not reach 10 meters. Thanks to their low weight, they can easily be lifted onto the roof. It is forbidden to lock the panels, as this may cause the panels to bend. Laying begins from the bottom corner of the roof and is carried out vertically: from bottom to top.

Conclusion

The roof slope is one of the factors that determines the installation process and further operation. To avoid corrosion, leaks and other troubles, it is important to correctly calculate what slope the roof should have.

This parameter is influenced by the climatic features of the region where the building is being erected.

Roofing from sandwich panels is a new word in the arrangement of pitched and flat roofs of various configurations and sizes. The design features of the material make it possible to create an airtight coating with ideal qualities. Sandwich technology involves the installation of ready-made roofing components. The construction of roofs using the roofing “pie” technology will require up to 50% less time than for laying other materials. The technical parameters of the building material, features of its installation and operation are discussed further in the review.

What are sandwich panels

Sandwich panel is a building material with a three-layer structure. The components of the roofing panel are tightly bonded to each other using a two-component polyurethane-based adhesive. The upper and lower layers of the three-level system are made of thin-sheet galvanized steel with a polymer coating. The thickness of the metal elements of the “pie” is 0.5 or 0.7 mm. Steel sheets are profiled with stiffening ribs. The middle layer is represented by insulation, which is a basalt mineral wool, polystyrene foam or polyurethane foam board.

Advantages of roofing material:

• presentable appearance;
• durability;
• increased fire resistance;
• strength;
• resistance to deformation;
• light weight;
• ease of installation work;
• resistance to aggressive environments and other negative external influences.

Characteristics and dimensions

A roof made of sandwich panels is characterized by good sound insulation, excellent thermal insulation qualities and water resistance. Sandwich roofing does not allow cold air to pass through from the outside and traps warm air inside the premises.

The linear parameters of a standard slab are:

• width – 1000 mm;
• length – from 2500 to 16000 mm;
• product thickness – from 50 to 250 mm.

The main characteristics of roofing material are thermal conductivity, load-bearing capacity, fire resistance, sound insulation and weight. The key influence on the technical parameters of the product is the type of insulation and the thickness of the panel.

The guideline for choosing panel thickness is the thermal insulation indicator. The thicker the slab, the more thermal air will be retained in the middle of the building.

Indicators of sandwich panels with mineral wool insulation:

• sound insulation – from 30 to 43 dB;
• thermal conductivity – 0.05 W/Mk;
• fire resistance limit – EI 30 to EI 180;
• flammability group - NG;
• density – from 120 to 140 kg/m3;
• specific gravity – from 17.5 to 43.5 kg/m2.

Characteristics of roofing slabs with polystyrene insulation:

• sound insulation – from 25 to 39 dB;
• thermal conductivity – 0.042 W/Mk;
• fire resistance limit – EI 15;
• flammability group – G1;
• density – 25 kg/m3;
• specific gravity – from 12.2 to 17.2 kg/m2.

Characteristics of sandwich panels with polyurethane foam insulation:

• sound insulation – from 30 to 35 dB;
• thermal conductivity – 0.022 W/Mk;
• fire resistance limit – EI 15;
• flammability group – G4;
• density – 41 kg/m3;
• specific gravity – from 9.2 to 15.5 kg/m2.

Three-level roofing systems have the ability to withstand heavy loads without compromising the quality of the material. The maximum wind load reaches 48 kgf/m2, the coating can withstand up to 150 kg of snow per 1 m2. The service life of sandwich panels reaches 30 years.

Preparation for installation

High-quality installation of sandwich slabs on the roof is impossible without preliminary preparation of the process. The first step is to familiarize yourself with the design and installation documentation. The project determined the size and type of sandwich panels, the number of slabs, the technological layout map and fastening methods nodes, amount of waterproofing materials.

Before starting installation work, you should check the position of the crossbars, rafters and purlins, eliminate possible differences, and check the angle of inclination of the slope. At the preparatory stage, the necessary tools and related materials are prepared.

Required tools and materials

To trim slabs, fasten materials and seal butt joints during installation work, the following material and technical equipment will be required:

• electric scissors;
• stationary circular saw;
• fine-toothed file;
• screwdriver or electric drill;
• building level;
• long roofing screws made of carbon or stainless steel, equipped with sealing washers;
• short self-tapping screws for fixing additional elements.

The length of the screws for fixing the sheets is selected based on the material of the supporting structure and the thickness of the panel itself. To fasten sandwich panel flooring, self-tapping screws 12.5 mm long are usually used.

In addition to the three-layer slabs themselves, additional elements and forming parts will be required to construct the roof:

• cornice strip;
• end strips and plugs;
• ridge strip.
• valleys.

Sheathing for sandwich panels

Various materials can be used to construct a frame for sandwich panels:

• tree;
• metal;
• reinforced concrete.

The advantages of a wooden support system are its affordable price, environmentally friendly material, low thermal conductivity and ease of assembly. The disadvantages of a wooden base include the need for additional treatment of the material to prevent fire and damage by fungus and insects.

Reinforced concrete supporting structures are characterized by a long service life, high strength, resistance to rust and low thermal conductivity. A significant disadvantage of reinforced concrete lathing is its heavy weight.

Metal lathing is a quickly erected, durable and reliable structure that is resistant to deformation. The negative qualities of a metal support are high thermal conductivity, the need for anti-corrosion treatment, and considerable cost.

The frame structure is designed taking into account the geometric parameters of sandwich panels. The distance between the sheathing runs should ensure that the slabs are fastened 5 cm from the edge, the supports should coincide with the place where the panels join.

Installation technology

Sandwich panels are lifted onto the roof using special equipment. To avoid damage to the material, the lifting mechanism must be equipped with load-handling devices in the form of vacuum suction cups or soft grippers.

Before starting work, remove the protective film from the bottom surface of the slabs. Roofing blocks are mounted in rows in the direction from the roof overhang to the ridge. The panels are fixed to the frame with roofing screws. Fasteners are screwed strictly perpendicular to the sheet, screwed without excessive force, so as not to damage the gasket.

Installation of a roof made of sandwich panels begins from the corner of the bottom row, which in turn forms a cornice overhang. Subsequent elements are mounted with an overlap, fixing them to the already laid blocks and to the sheathing.

The end parts of the sandwich panel are equipped with Z-Lock type locks. The sheets are fixed in the longitudinal direction using locking connections. It is important to ensure that the ridges of the locks fit tightly into the depressions of subsequent slabs. To reliably seal the joints, butyl rubber or silicone sealant is applied to the locking grooves.

After laying the roofing slabs, they begin to install the roof ridge. Sequencing:

1. Installing the inner ridge strip.
2. Filling the gaps between the plates with polyurethane foam.
3. Installation of profile polyurethane gasket.
4. Filling joints with mineral wool or other insulation.
5. Fixation on the ridge of the ridge strip.
6. Installing a polyurethane gasket with a self-adhesive base on the top of the ridge.
7. Installation of the ridge strip using short self-tapping screws.

Minimum roof slope

In the presence of transverse connections, window hatches and other parts that violate the solidity of the coating, the minimum slope of the roof made of sandwich panels is not less than 7 0 . In cases where a solid sheet fills the entire span along the length, the slope may be reduced to 5 0 .

At the roof design stage, the slope of the slope is selected based on the climatic characteristics of the region. For dry and hot areas, the roof slope can be from 5 to 25 0. In areas characterized by frequent rain, the roofing sheet is laid at an angle of at least 40 0.

When laying roofing sheets on slopes with a slope greater than 15°, additional supports must be installed to prevent the sandwich panels from sliding down.

Installation with transverse joints

The technology for arranging transverse connections includes the following steps: at the panel of the next row, a part of the lower skin and insulation equal to the amount of overlap is cut off. The amount of overlap is determined based on the slope of the slope, for roofs with a slope from 5 to 10 0 - 30 cm, for a slope from 10 to 20 0 - 20 cm. Sealant is applied to the lower plane of the resulting protruding part of the outer skin, the panel is attached to the frame and fastened with laid sheet of the bottom row. The junction of the slabs of the lower and upper rows should be at the frame run. The gap between the sandwich panels must be completely filled with sealants to avoid leakage.

Installation errors and their consequences

The main mistakes in installing sandwich roofing:

• inaccuracies in design documentation;
• uneven frame;
• cutting panels with a grinder;
• incorrect choice of screws;
• over-tightening or under-tightening of fasteners;
• neglect of seals;
• incorrect arrangement of abutments and seam connections.

As a result of mistakes made at the installation stage, roof covering leaks occur. Violation of the technology is fraught with a decrease in the wind resistance of the flooring and other technical parameters of the material declared by the manufacturer.

Operating rules and repairs

Operating a flat roof made of sandwich panels does not require much effort. Operational measures come down to timely removal of debris from the roof. Once every six months it is necessary to inspect the technical condition of the coating. If defects are identified, carry out repair and restoration work as soon as possible.

The most common defect is damage to the polymer shell on the outer skin. Special enamels are used for repairing sandwich panel roofs. The paint and varnish material for restoration work is selected taking into account the type of protective coating, color and shade of the roofing slabs.

Depressurization of butt joints is a defect that can not only lead to leaks, but also destruction of the insulation. Opened seams must be coated with sealant.

Review of modern manufacturers

The roofing materials market offers a wide selection of sandwich panel manufacturers. The leading positions in the designated segment are occupied by:

• Promkpanel company specializes in the production of sandwich panels for roofs based on mineral wool and expanded polystyrene, as well as shaped elements. The advantages of a domestic manufacturer are high quality products and an affordable price per m 2 of roofing;
• Petropanel company supplies sandwich panels with mineral wool insulation to the domestic market. The production of three-component roofing slabs is carried out using equipment from the English company ISOWALL;
• Kraft SPAN company produces high-quality roofing panels with high levels of fire resistance, tightness and strength. Basalt mineral wool was used as an insulating layer. The company's production base is equipped with equipment from the Australian company Hilleng;
• Izobud company - the company’s products have been represented on the building materials market since 1998 and are widely known both in Russia and abroad. Roofing materials undergo strict control to ensure compliance with international standards and sanitary and hygienic standards. The manufacturer supplies the market with sandwich panels for roofing with insulation made of mineral wool and polyisocyanurate foam;
• Vesta Park company has been repeatedly nominated at various competitions in the field of building materials. The advantages of products from Vesta Park are high quality that meets international standards, a wide selection of colors for sandwich panels, and a loyal pricing policy.

Sandwich panels have found wide application in roofing of industrial and agricultural buildings, retail facilities, and sports facilities. Properly designed and correctly installed decking made from three-layer systems will serve as reliable shelter for many years.

BELPANEL K4 roofing sandwich panels are installed with cutting of the internal lining (cutting is carried out on site).

In the case of a gable roof, the left and right notches allow simultaneous installation on both slopes on the same side.

BELPANEL roofing sandwich panels can be attached to roof purlins made of steel, wood or concrete with an integrated steel profile.

When designing the roof, you should take into account the minimum roof slope for BELPANEL K4 roofing sandwich panels - αmin = 10%, the maximum allowable distance between supports.

The minimum width of the intermediate support for BELPANEL roofing sandwich panels is 60 mm. BELPANEL roofing sandwich panels have a special film applied on both sides, which is used to protect BELPANEL roofing sandwich panels during transportation and installation.

On the inside of BELPANEL roofing sandwich panels, the film is removed immediately before installation, and on the front side of BELPANEL roofing sandwich panels - immediately before completion of work. In places where overhead elements are attached and under screws, the film is removed before installation.

To carry out assembly cutting of BELPANEL roofing sandwich panels, only electric shears and saws that allow cold cutting are allowed. The cutting area must not be overheated to avoid damaging the anti-corrosion protection of the sheet. After each cutting, the surface of BELPANEL roofing sandwich panels must be thoroughly cleaned of chips.

Before installing each of the BELPANEL roofing sandwich panels, check that the joining trapezoids of the top profiled sheet are completely cleaned.

To lift BELPANEL roofing sandwich panels, carry them and install them at the installation site, it is recommended to use a vacuum or mechanical grip.

At the place where the vacuum grip is attached to the roofing sandwich panels, it is necessary to remove the protective film. Installation of BELPANEL roofing sandwich panels is carried out from the lowest panel. The following roofing sandwich panels are installed according to the diagram.

The first of the BELPANEL roofing sandwich panels is installed with open corrugation towards the end of the building.

Fastening BELPANEL roofing sandwich panels

To fasten BELPANEL roofing sandwich panels, use special self-drilling screws made of carbon or stainless steel with washers and a seal made of synthetic rubber (EPDM: ethylene propylene diene monomer). The length of the screws depends on the thickness of the BELPANEL roofing sandwich panels used and the type of substructure!

Pay special attention to the tightening force of self-drilling screws. They should be tightened neither too tightly nor too loosely.

Avoid over-tightening the fasteners as this will reduce their lifespan and may damage the panel. The first sign of over-tightening is the appearance of dents on the surface of BELPANEL roofing sandwich panels.

Longitudinal connection of BELPANEL roofing sandwich panels

The longitudinal connection between roofing sandwich panels must be additionally connected with screws, as shown in the figure. When connecting BELPANEL type K-4 roofing sandwich panels, the distance between two adjacent screws should be no more than 0.5 m.

Determining the required number of screws.

When determining the required number of screws, the following must be taken into account:

1. Wind load, depending on the location of the object and its height;
2. Object type (open, closed, etc.);
3. In what conventional zone of the roof is the attached roofing sandwich panel located (panels in the extreme zones are most susceptible to gusts of wind);
4. Load-bearing capacity of one fastener.

The required number of screws is determined by the designer in accordance with the standards for a given climatic region.

Sealing the longitudinal connection between panels.

During installation, you must pay attention to the connection of BELPANEL roofing sandwich panels. A gap must not be allowed to appear at the longitudinal connection between the roofing sandwich panels!

Always seal the longitudinal connection, regardless of the roof slope (silicone sealant or Abris Lb 10×2 tape).

When it is necessary to use sealant in a longitudinal joint on the inside of the roof, it must be applied manually before installing each of the subsequent BELPANEL roofing sandwich panels.

To prevent the circulation of air and steam, the joints between roofing sandwich panels and columns should be carefully sealed. A sealing tape is glued to the surface of the column adjacent to the roofing sandwich panels. The tape is glued on the inside of the fastening line to also seal the holes for the fasteners.

Today we will talk about a building material that was recently considered purely for walls. Currently, manufacturers offer a variety of it that covers the roofs of buildings and structures. This is a sandwich panel roof. In the article we will examine issues related to the structure and composition of the material, its classification, as well as the technology of installation on the roof truss system, taking into account some of the nuances of construction operations. Once you understand the information received, you will, as they say, be on the same page with the craftsmen who were entrusted with covering the roof with sandwich panels.

Roof made of sandwich panels Source forza.uz

What are sandwich panels

This is a three-layer material formed by metal sheets, between which insulation is laid. Either polystyrene foam, polyurethane foam or basalt wool are used as thermal insulation here. The first two options are preferable due to their higher technical and operational characteristics.

A galvanized steel sheet coated on top with either paint or a polymer layer is used as metal cladding. This primarily increases the protective qualities of the steel sheet, prolonging its difficult operation on the roof. Secondly, there is a huge variety of color designs, which allows architects and designers to solve some design problems.

Moreover, all layers are glued together with a special compound - two-component polyurethane glue, which gives the three-layer structure special strength. It must be added that steel sheets are not necessarily a flat surface. Today, manufacturers mainly offer roofing sandwich panels for roofs with a profiled shape in the form of corrugated sheets. That is, with a trapezoidal or wavy shape.

Three-layer sandwich panel structure Source pedkolledj.ru

Advantages of sandwich panels

The first advantage in the list of positive characteristics of this building material is a complete roof set in terms of insulation and waterproofing. That is, by installing the panels on the roof, you solve the whole problem at once. Insulation is understandable, but waterproofing problems are solved by the bottom sheet of galvanized sheet.

And others advantages:

long-term exploitation with proper installation;

small specific weight, and this reduces the load on the rafter system;

calmly withstands quite serious loads;

minimum deformation;

high sound and heat insulation characteristics;

high fire resistance;

elevated aesthetic quality;

rapidity roof assemblies;

the material is practically not susceptible climatic features of the region.

Let’s add to this list that the minimum slope of a sandwich panel roof is 5 0 . But with one condition, that the panels will be selected taking into account the length of the house run. With a slope of more than 10 0, it is allowed to mount panels of various lengths, strictly joining them using a special technology.

And one more positive side. Sandwich panels are a universal material, so today they are used to cover roofs, regardless of the purpose of the building itself. Even for residential buildings.

High aesthetics of sandwich panel roofs Source st-taseevo.ru

On our website you can find contacts of construction companies that offer the service of designing and carrying out roofing work, finishing and insulating houses. You can communicate directly with representatives by visiting the “Low-Rise Country” exhibition of houses.

Characteristics and dimensions

Let's start with the fact that this roofing material is produced by many manufacturers according to technical specifications. Although there is GOST number 32603-2012. True, the standard is intended for panels with mineral wool insulation.

So this document says that roofing sandwich panels, designated in the markings by the letter “K”, should be produced with exact dimensions:

thickness 50-300 mm;

width– strictly 1000 mm;

length from 2000 to 14000 mm.

Many manufacturers strictly adhere to these requirements. But they offer longer panels if you order them. At the same time, instead of mineral wool, higher-quality insulation materials are used in terms of both strength and reduced thermal conductivity. This is polystyrene or polyurethane.

As for metal sheets, as mentioned above, this is a flat surface, trapezoidal, wavy and knurled. The last one is grooves either in the upper or lower wave, which serve as stiffeners. Rolled panels are considered more durable roofing elements. By the way, rolling is done both on the lower steel sheet and on the upper one.

Standard sizes of sandwich panels Source postroika.biz

On our website you can get acquainted with the most popular house projects, for the finishing of which sandwich panels and a ventilated facade were used - from construction companies represented at the exhibition of houses "Low-Rise Country".

And a few words about characteristics:

thermal conductivity depends on the type of thermal insulation material used: mineral wool 0.034-0.044 W/m K (depending on density), polystyrene foam - 0.03-0.04 W/m K, polyurethane foam - 0.019-0.025 W/m K;

density– 40-50 kg/m2;

life time- 50 years.

Installation technology

Let's start with the fact that a roof made of sandwich panels is, first of all, a quick and fairly simple installation. But, as with all construction operations, careful preparation is required.

Preparatory stage

It includes:

accuracy check planes of the roof purlin, no differences;

strict perpendicularity between support posts and crossbars;

check tilt angle stingrays;

if additional waterproofing, then they carry it out too.

Installation features

As already mentioned, installation is a simple process. But there are quite a lot of nuances on which the quality of the final result depends.

Let's start with the fact that a metal rafter system is laid under the sandwich roof panels. These are either standard steel profiles, or load-bearing elements made of galvanized sheets that imitate standard profiles. If the first option is used, then holes for fasteners will have to be made in the profiles in advance. If the second option is used, then thin galvanized elements can be easily drilled with metal roofing screws, which are used to fasten the roofing decking.

Sandwich panels are lifted onto the roof by a crane Source roofs.club

And one more point related to the processing of the material. Often panels have to be cut to length or width. A grinder cannot be used. The rotation speed of the cutting disc of a power tool is enormous. A zone of elevated temperature is formed on the cut surface, which burns the zinc and polymer layer, exposing the metal. It is at the cut points that the panels begin to corrode, which reduces their service life.

So, installation operations algorithm:

Necessary prevent contact sandwich panels with supporting structures. Therefore, the latter, or rather, their contact surfaces, are covered with sealing self-adhesive tape.

Crane panels are raised on the roof, where they are laid, starting from any side of the roof structure.

Adjacent panels are connected using a locking connection, which ensures complete tightness of the joint. Some manufacturers recommend additionally using silicone sealant for sealing, which is applied to the surface of the lock.

All panels are attached to the supports with special self-tapping screws, which have two threads: the lower one for fastening to the support, the upper one for holding the upper steel sheet. The self-tapping screws are equipped with gaskets made of neoprene rubber, which does not change its qualities and properties under the influence of natural loads throughout its operation.

Self-tapping screws for fastening sandwich panels to supports and to each other Source krepezhinfo.ru

It is very important to tighten the screws correctly. Firstly, they are screwed into the upper wave of the sandwich panels. Secondly, you cannot overtighten them; this will compress the gasket, which means it will open the mounting hole slightly for moisture to penetrate. By the way, you also can’t underdo it for the same reason. Thirdly, the fasteners must be screwed in exactly perpendicular to the plane of the roofing.

Since the locking connection is practically an overlap, adjacent panels to be joined must be fastened together using the top galvanized steel sheets. For this, short metal screws are used.

Video description

Watch the video that shows how to properly cover a roof with sandwich panels:

Installation with transverse joints

If the length of the slope is large enough and this parameter cannot be covered with one panel, then laying the material with transverse joints is used. A very interesting technology is used here, which is based on the process of forming an overlap of two adjacent panels. This is done like this:

the bottom steel sheet is cut off on the overlap length of the panel that will be laid as the top element;

at the same distance the insulation is also cut off;

all that remains is top sheet;

trimmed this way the panel is laid on the adjacent one, covering part of the bottom panel with the remaining steel protrusion;

two joined panels attached to supports, and the overlap is done using small self-tapping screws with the obligatory coating of the overlap plane with sealant.

Please note that if the slope angle is 5-10 0, then the overlap should be within 300 mm, if the angle is above 10 0, then the overlap length is 200 mm. Look at the photo below, which shows how sandwich panels are laid using this technology, and in what order they should be installed on the roof.

Connection of sandwich panels along the length of the slope Source www.mpcomm.ru

In principle, at this point we can consider that the sandwich roof is ready. All that remains is to install the additional elements. This is primarily a hobby. Thermal insulation material is laid between the upper edges of the laid panels, and the top is covered with a metal element painted in the color of the sandwich panels. If there is an abutment of the roof to a protruding wall, then this joint is covered with a so-called flashing. This is an angular type profile, one shelf of which is attached to a vertical surface, the other to the surface of the panel, thereby closing the joint.

Roof ridge made of sandwich panels Source rsp.spb.ru

Video description

The following video is about the types and characteristics of sandwich panels:

Conclusion on the topic

Today, sandwich panels for roofing are one of the most popular materials of the new generation, especially in industrial construction. Simplicity of installation does not mean that this process can be carried out by illiterate and inexperienced craftsmen. It won't be too difficult to ruin the panels. Therefore, it is very important to strictly follow the instructions provided by the manufacturers.