Plastering csp boards. How to seal the seams of chipboard slabs. Prices for cement bonded particle boards

The simplest surface finishing of DSP is painting with the formation of open seams (gaps) between the boards

Facade painting of DSP TAMAK. System with visible expansion joints

Facade painting of DSP TAMAK. Closed expansion joint system

PLASTER

Facade plaster DSP TAMAK. System with visible expansion joints or joints covered by decorative strips

Diagram of an open expansion joint to compensate for linear changes caused by temperature and humidity influences.

Facade plaster DSP TAMAK. Closed expansion joint system

Diagram of a closed expansion seam

NOTE

When carrying out finishing work, it is necessary to strictly follow the instructions for the use of material systems given by the manufacturer.

Texture paints are the least demanding on the quality of the finished surface, so they are recommended for painting facades yourself with a roller. Non-textured (smooth) paints are recommended to be applied only to specially prepared surfaces with recessed and puttied screws.

For fastening TAMAK DSP to frames on facades, it is recommended to use galvanized or anodized self-tapping screws(hereinafter referred to as self-tapping screws), because black (phosphated) can corrode under the influence of atmospheric moisture; in this case, they lose their strength qualities, and rust can appear through the finish coating.

Surface preparation of TAMAK CBPB for façade finishing work

Before painting, it is necessary to prepare the surface of the DSP as follows.

PAINTING
The simplest surface finishing of DSP is painting with the formation of seams (gaps) between the boards (see Fig. 1). The most suitable paints for this purpose are acrylic or silicone based paints. Depending on the type of paint and the wishes of the customer, the paints are applied in one or several layers to the dry, primed surface of the slab.

1 - DSP;
2 - Amphiselan Tifgrunt LF CAPAROL;
3 - covering paint Silicone-EG inf3501;
4 - elastic filler for joints "Bau-silicone" inf. 5501

Subsequently formed seams (gaps) between the plates can:
- remain as a design detail - in this case, it is enough to cover the edges of the slab with the desired paint
color range;
- filled with elastic mastic; - cover yourself with decorative metal, plastic or wooden slats.

In cases where a surface finish without seams is required, a flat filler system must be used.

PLASTER

Plastering works on DSP sheathings it is possible to carry out with or without a visible seam.

Structural plaster system using the example of CAPAROL with open expansion joints

Primer Putzgrund Ambient air parameters when applying Putzgrund primer: T =18 °C, W =50%. Primer consumption - 0.28 kg/m2. Drying time -12 hours. Application is carried out using a roller with a pile length of 10 mm. 10% water by weight is added to the primer. The time for applying primer to 10 panels is 2 hours.

Texture plaster RolPutz Palazzo 25 Ambient air parameters when applying Rol Putz structural plaster: T = 18°C, W = 50%. Consumption of Rol Putz plaster is 2.5 kg/m. Drying time to the point where paint can be applied is 24 hours. The time required for the plaster to polymerize, allowing the wall panels to be transported, is 72 hours. Application is carried out using a trowel, then using a roller with a pile length of 18 mm. It takes 7.5 minutes to apply a layer of plaster with an area of ​​1 m.

Finish coating 1 layer Muresko plus Palazzo 25. Ambient air parameters when applying Rol Putz structural plaster: T = 18°C, W = 50%. Consumption of Rol Putz plaster is 2.5 kg/m. Drying time to the point where paint can be applied is 24 hours.

The time required for the plaster to polymerize, allowing the wall panels to be transported, is 72 hours. Application is carried out using a trowel, then using a roller with a pile length of 18 mm. The coating should be structured. It takes 7.5 minutes to apply a layer of plaster with an area of ​​1 m.

Applying RolPutz structural plaster
Ambient air parameters when applying RolPutz structural plaster: T = 18°C, W = 50%. Finish paint consumption - 0.56 kg/m. Drying time 12 hours. Application is carried out using a roller with a pile length of 18 mm. It takes 3 minutes to apply a layer of paint with an area of ​​1 m. For this type of work, you should use the technology of one manufacturer and follow its recommendations.

Surface preparation system for plastering without visible expansion joint CAPAROL company is presented below:
1 Insulating adhesive CAPATECT - DAMMKLEBER
2 Thermal insulating boards made of mineral fiber.
Facade thermal insulation boards CAPATECT -MW - Fassadem dammplatten.

3 Reinforcing layer
adhesive and putty mass CAPATECT -Klebe - und- Spachtelmasse.
+ glass mesh CAPATECT Gewese
4 Putz GRUNT 610 primer.
5 Top layer of plaster.
Structural plaster ROLL PUTZ.

WALLPAPER
Direct wallpapering of the working surface is carried out after attaching the primed slabs and filling the expansion joints with elastic mastic.

Surface finishing of the slabs can be done using vinyl wallpaper, glass wallpaper, non-woven wallpaper. In this case, the expansion seams will be hidden.

Vinyl wallpaper is used for finishing rooms with increased aesthetic requirements and where high wear resistance or washing ability of interior elements is required.

Attention!
1 It is not recommended to use paper-based wallpaper!
2 It is recommended to use wallpaper manufacturer's adhesive and technology.
3 It is possible to attach gypsum plasterboard sheets directly to DSP sheathings using screws
with overlapping seams, in this case it is possible to use any type of wallpaper.

COVERING WITH CERAMIC TILES
It is not recommended to glue ceramic tiles directly onto DSP sheets.

To obtain a durable finish on DSP sheathing, it is necessary to fasten the gypsum board sheets directly onto the DSP sheathing using screws with a seam overlap of at least 200 mm. (in this case, the DSP cladding plays the role of a load-bearing element).

Adhesive mastic is applied to the entire working surface of the slab. 4 - GKLV sheets.
In rooms with high humidity (bathrooms, showers), ceramic cladding of high humidity rooms is recommended according to the following scheme (Fig. 3).
1 - DSP;
2 - expansion seam;
3 - fastening the DSP to the frame;
4 - sheets of gypsum boards;

6 - soil "Tifengrunt" inf.4503;
7 - Flexkleber glue inf. 0710;
8 - ceramic lining;
9 - mastic for seams "Fugenweiss" inf.7503

In rooms with insufficient ventilation for structures with a constant water load (walls adjacent to the bathroom, shower stall), DSP with an appropriate waterproofing coating should be used (Fig. 4): 6 - “Flechendicht” waterproofing

1 - DSP;
2 - expansion seam;
3 - fastening the DSP to the frame;
4 - sheets of gypsum boards;
5 - junction of gypsum board sheets;
6 - waterproofing "Flechendicht";
7 - soil "Tifengrunt" inf.4503;
8 - Flexkleber glue inf. 0710;
9 - ceramic cladding;
10 - mastic for seams "Fugenweiss" inf.7503

FLOOR COVERINGS
Floors made of cement-bonded particle boards under thin-layer floor coverings (Fig. 5) linoleum, carpeting must be puttied over the entire plane, paying special attention to the joints of the boards. For putty, it is recommended to use acrylic-based elastic mastics. It is recommended to remove possible unevenness and inconsistencies between the edges of the slabs by grinding using the previously described technology

1 - DSP;
2 - soil "Tifengrunt" inf. 4503;
3 - putty;
4 - linoleum;
5 - elastic filler for joints "Bau-silicone" inf.5501;
6 - expansion seam

Ceramic tile floor
When installing a floor made of ceramic tiles, it is recommended to use prefabricated floor bases made of gypsum fiber sheets, on a leveling layer of dry backfill, with the DSP playing the role of a load-bearing base (see diagram, Fig. 6)

1 - DSP;
2 - expansion seam;
3 - dry backfill;
4 - PE film 0.1 mm (bitumen paper);
5 - Knauf Superpol (floor element);
6 - screws for GVL 3.9x19;
7 - adhesive mastic;
8 - Fugenfüller GV putty;
9 - waterproofing "Flechendicht";
10 - soil "Tifengrunt" inf.4503;
11 - Flexkleber glue inf. 0710;
12 - ceramic cladding;
13 - mastic for seams "Fugenweiss" inf.7503;
13 - edge tape

Continuing the series of articles on the use of CBPB in construction, we present recommendations from manufacturers for processing CBPB (cutting, drilling, milling, grinding), fastening CBPB (using nails and screws, placing and making seams) and surface finishing (painting, plastering).

Let us remind you that cement particle boards (CSB)- a building material with unique properties used in “dry installation” technology. DSPs belong to a generation of modern composite building materials that have properties that combine the strength and durability of cement with the flexibility and ease of wood processing. The universal technical characteristics of DSPs have already been fully appreciated all over the world.

Modern slabs are made by pressing a molded technological mixture consisting of softwood chips (24%), Portland cement (65%), minerals (2.5%) and water (8.5%).

Options for using DSP boards for decorating the facades of buildings of any type are described.

Today on the Internet there is a huge amount of advice and recommendations for working with CBPB boards, but many of them do not correspond to reality. In order to figure out how to properly work with CBPB boards, we turned to the manufacturers' recommendations.

DSP PROCESSING.

Attention! To obtain a high-quality processed surface of cement particle boards, cutting tools made of hard alloys are used.

Cutting.
When cutting (cutting, trimming) cement particle boards on site, hand-held circular saws with a disk diameter of 250 mm and a number of teeth of no more than 40 are used. The rotation speed of the disk is 3000-4000 rpm.

To obtain a smooth edge, the cutting disc should protrude beyond the bottom surface of the slab to the minimum possible distance. The slabs are cut from the reverse side in order to preserve the front side from damage.

Drilling holes.
To drill holes in cement bonded particle boards, hand-held electric drills with electronic speed control are used. To drill single holes, you can use twist drills made of HSS cutting material; for long-term operation, drills made of carbide are recommended.

Milling.
For milling cement-bonded particle boards, hand-held electric milling machines with end mills equipped with carbide tips are used. The rotation speed of the cutting tool ranges from 25-35 m/sec.

Grinding.
Grinding of cement-bonded particle boards is not carried out at the JLLC "TsSP BZS" enterprise. In practice, when installing slabs, local irregularities may appear at the joints, which should be removed by grinding. For this purpose, hand-held vibrating, eccentric (orbital) or belt sanders are used. The grain size of the grinding material should be in the range of 40-80 units.

Attention! When grinding, the top finely dispersed covering layer is damaged, which leads to the opening of the structure of the slab, an increase in water absorption, and a deterioration in physical and mechanical properties. After finishing the treatment, it is necessary to apply primer to the slabs to stabilize the surface and reduce hygroscopicity.

When cutting, drilling, milling and grinding cement-bonded particle boards, a large amount of dust is released, so it is necessary to use dust suction devices and aspiration means.

MOUNTING OF DSP.

Attention! All connecting elements and metal elements of supporting structures must have an anti-corrosion coating. Before attaching cement bonded particle boards, it is necessary to ensure that the frame elements are vertical and horizontal and that they are in the same plane. All planes and edges of cement bonded particle boards must be primed before fastening. Particular attention should be paid to priming the edges.

Cement particle boards are attached to load-bearing structures using self-tapping screws and rivets (when attached to a metal profile).

In order to ensure technologically correct fastening of cement-bonded particle boards, the main requirement is to comply with the pitch between fasteners and the distances between them and the edges of the boards, according to the following diagram and table.

Holes for self-tapping screws and rivets are drilled into the DSP with a diameter 1.2 times larger than their own diameter. To deepen the heads of self-tapping screws and rivets, the holes are first countersinked to a depth 1.5-2 mm greater than the height of the heads.

To fasten the DSP without pre-drilling holes, you can use special self-tapping screws with a reinforced tip and a countersunk head equipped with blades to form a recess (countersink) to fit its dimensions.

Attention! The size of screws and self-tapping screws is chosen with the condition that the length of the pinched part is at least twice the thickness of the DSP board and at least 10 screw diameters. When tightening screws and self-tapping screws, do not use excessive force to avoid cracking the slab.

The table shows the minimum dimensions of screws and self-tapping screws used for fastening cement-bonded particle boards to elements of load-bearing frames, depending on its thickness and the diameter of the dowel of the hardware product.

Attention! When using cement particle boards for cladding walls, partitions and ceilings, it is necessary to lay them with a seam, the width of which is 6-8 mm for external use and 3-4 mm for internal use. The seam can be closed with an external strip, a wooden, tin, metal or polymer profile can be inserted, or covered with plastic putty based on acrylic resins or polyurethanes.

SURFACE FINISHING DSP.

Cement particle boards, like any wood-based particle boards, are subject to slight expansion and shrinkage under the influence of changes in temperature and humidity levels.

At the joints of the slabs, it is necessary to leave a gap for thermal expansion, allowing linear expansion of the slab. To prevent cracking in the joint compound, the width of the closed expansion joint should be 8 mm for external use and 4 mm for internal use.

The simplest is an open expansion joint.

Attention! Cement particle boards are supplied from the manufacturer with a moisture content level of 9±3%. Interim storage before processing, as well as installation, must be carried out in dry conditions. Failure to comply with this requirement may result in the boards absorbing an unacceptably high amount of moisture, which can lead to damage in closed seams and/or fastening areas, as well as damage to the paint coating on the surface of the boards applied at the work site.

The designs of the end faces of cement-bonded particle boards and joints are varied. The most common systems are presented below. When using cement bonded particle boards outside buildings and for cladding walls, it is not recommended to sand the surface of the boards (except in cases where the sanded surface is subject to special requirements). Sanded boards, in which the wood particles are directly visible on the surface, are generally used for flooring only (due to strict thickness requirements) and also in special cases.

.
Open expansion joint.

.
Open expansion joint with chamfered edges of the CBPB.

Closed expansion joint.

Using a floor strip.

Attention! Regardless of the methods used for surface finishing of cement bonded particle boards, mandatory priming of their planes and edges is required. The reverse sides of the slabs are primed before installation.

Painting of DSP boards.
The simplest and most common method of surface finishing of CBPB is painting with the formation of expansion joints between the slabs (open joints).

In this case, before applying paint to the surface of the cement bonded particle board, you must:
- deepen all screws 1-2 mm into the slab;
- clean the surface of the stove from dirt and dust. If there are grease or oil stains, they must be degreased;
- when cleaning wet, it is necessary to dry the slab;
- fill all cavities and chips with façade putty;
- after the putty has completely dried, sand the putty areas;
- clean and prime the front side and edges of the cement bonded particle board (stabilizes the surface, reduces hygroscopicity, unifies the base);
- paint the slab.

Attention! Paints and varnishes must contain pigments that are stable in an alkaline environment. Unstable pigments can lead to variations in color shades.

Filling expansion joints with elastic putties.
Expansion joints are filled with elastic putties based on acrylic resins and polyurethanes. Silicone putties are not used for cement-bonded particle boards.

The main rule for the operation of an expansion joint is the exclusion of three-sided contact in the joint, which causes uneven loading of the elastic filler with its subsequent separation from the edges of the cement-bonded particle boards.

To do this, use liners made of polyethylene tape or cord made of foamed polyethylene, which allows the elastic filler to adhere only to the opposite edges of the cement-bonded particle boards and evenly distribute the load on the filler.

Closed expansion joint made of elastic putty with a liner made of polyethylene tape.

Closed expansion joint made of elastic putty with a liner made of foamed polyethylene cord.

Plastering works.
Plastering work on cement-bonded particle boards is carried out with an open seam and a seam closed with a finishing system or flashing strips.

Plastering work is carried out in cases where the surface of the slabs should look monolithic and smooth, without visible expansion joints. As is known, with a change in relative humidity, elongation or shrinkage of CBPB boards occurs. To ensure that these changes do not affect the appearance of the plastered surface and do not lead to the formation of cavity (hairline) cracks, it is necessary:
- attach previously primed slabs to the structure;
- fill the resulting expansion joints with elastic putty;
- perform flat putty on the working surface;
- press an alkali-resistant fiberglass mesh into the resulting coating layer;
- apply a leveling layer of putty;
- perform final (finishing) surface finishing.

Facing cement particle boards with ceramic tiles or decorative stone.
When facing the working surfaces of cement bonded particle boards with ceramic tiles or decorative stone, elastic mastics must be used to fasten them and fill expansion joints.

It is recommended to apply adhesive mastic to the entire working surface of the slab. It is recommended that expansion joints between slabs be drawn out, ensuring that they coincide with the joints of ceramic tiles and decorative stone. Otherwise, ceramic facing tiles or a decorative stone element that overlaps the joining slabs should be glued only to one of the slabs, leaving the overlap area without adhesive mastic.

In rooms with insufficient ventilation for structures with constant water load (bathtub, shower), pre-primed cement-bonded particle boards should be used, followed by applying waterproofing putty to them.

Cement particle boards (CPB) are classified as universal sheet building materials. The raw materials for cement particle boards (CPB) are Portland cement, crushed wood shavings and additives that reduce the influence of substances contained in wood on the formation of cement stone.

Manufacturing technology of cement bonded particle boards (CPB)

The technology for manufacturing CBPB can be briefly described as the formation of a three-layer “pie” from two types of cement-bonded particle mixture: a mixture with fine-bonded aggregate forms the outer layers, and a mixture with coarse aggregate forms the inner layer. The laminated board is then molded under high pressure using hydraulic presses to achieve perfect smoothness and thickness.

Application of cement bonded particle boards (CSP)

DSP is used:

• As cladding and cladding along guides or frames, vertical - for walls, partitions, racks, ventilation hoods, etc., both for interior decoration and for facades.
• As an outer screen layer of a ventilated facade.
• In floor and flat roof structures.

DSP is not a serious competitor to fibreboards, plasterboard, gypsum fiberboard and bakelized plywood, due to the variation in the characteristics of these sheet materials. All these plates are in demand depending on the working conditions and the required performance qualities.

DSP board size

The standard sizes of DSP are 2.7 * 1.25 m and 3.2 * 1.25 m with gradations of thickness in mm 8; 10; 12; 16; 20; 24 and 36.

Main technical characteristics of cement-bonded particle boards (CSP)

Let us list the main characteristics of CBPB boards:

1. Specific gravity (density) – 1250-1400 kg/m3. A standard DSP sheet with dimensions of 2.7 * 1.25 m and a thickness of 16 mm weighs 72.9 kg.
2. Ultimate bending strength for thicknesses of 10, 12, 16 mm - 12 MPa; with a thickness of 36 mm - 9 MPa.
3. Tensile strength perpendicular to the plane of the slabs is not less than 0.4 MPa.
4. Modulus of elasticity in bending – not less than 3500 MPa.
5. Classification by flammability - group G1 (classified as low-flammable).
6. Frost resistance of 50 cycles with a guarantee of a decrease in strength by no more than 10%.
7. Thermal protection properties. Thermal conductivity coefficient is 0.26 W/m*deg C.
8. The value of the coefficient of linear expansion is 0.0235 mm/m*deg C.
9. Vapor permeability coefficient 0.03 mg/m*h*Pa.
10. Specific resistance when pulling out screws is from 4 to 7 N/m.
11. Based on biostability, they are classified as class 4 products
12. In terms of sound insulation - with a thickness of 12 mm, the airborne noise insulation index value is 31 dB. When laid on a reinforced concrete base made of load-bearing slabs, the penetration of impact noise with a thickness of 20 mm CBPB reduces by 16 dB. When laid on elastic materials - by 9 dB.
13. Linear increases in size after exposure to water for 24 hours are 2% in thickness and 0.3% in length.
14. Service life when used in dry rooms is at least 50 years.

Pros and cons of cement-bonded particle boards (CSB)

Let us list the main advantages of CBPB boards:

• Environmental friendliness. DSP does not contain any harmful or dangerous substances either in its composition or in its manufacturing technology. There are no phenolic-formaldehyde resins in the particle filler.
• Frost resistance is good - at least 50 cycles.
• Fire resistance G1 is a definite plus for facing material.
• Moisture resistance of CBPB boards that do not have a protective layer of hydrophobization is weak, protection from moisture is required - minus
• Sound insulation and noise protection qualities are excellent.
• Good biostability. Fungus and mold do not form on the surface of the slabs, even when used in a humid environment.
• Excellent resistance to longitudinal deformation, used for cladding along guides in frame houses of any number of floors.
• It goes well with other materials and structures, such as wood, polymers and plastics, metals and ceramics.
• High technology, simplicity and speed of processing. Cutting and drilling possible. Installation is simple, most hardware is suitable.
• Almost all types of finishing using DSP are possible, you can paste over any types of wallpaper, including heavy ones, plaster, tile, paint with any compositions - water-based, acrylic, oil, alkyd, etc.
• The smooth working surface of the DSP and perfectly even thickness allow you to save on finishing. On the smooth (cemented) side of the DSP sheet it is possible to apply a layer of paint without priming, especially since the adhesion is excellent.
• In terms of cost, CBPB boards are quite competitive with other sheet cladding materials, with favorable strength indicators.

The disadvantages of DSP boards include:

• The sheets have a significant mass, up to 200 kg depending on the thickness. When working on the upper tiers, you cannot do without lifting mechanisms, which leads to a certain increase in cost. Installing heavy slabs at height is also difficult.
• The service life is not very long - in contact with the external environment no more than 15 years. Manufacturers guarantee fifty years of operation only under normal humidity conditions, which is not always realistic.
• Thin, from 8 to 36 mm, DSP sheets with a significant area - about 4 m2 and weight cannot but have some fragility. Working with DSP is not so easy; it requires care. The slabs may break during installation.
• Sealing joints and seams between DSP sheets is not possible with any material. They recommend sealants that can mask the seam, provided they are elastic in the presence of moisture. Putty compounds that have properties of rigidity after setting cannot be used for sealing joints; this can lead to deformation of slabs operating in weather conditions and to a reduction in their service life. Sealants based on rubber bases are considered the best option for CBPB.
• DSPs are hygroscopic, and linear expansion when cladding facades is inevitable. Façade plaster on CBPB without reinforcing mesh and protection of CBPB from moisture rarely does not crack after five or even less years of operation. If there are errors in installation - insufficient fasteners or frames and work in humid conditions, the DSP sheets can go in “waves” and even come off the fasteners. Sometimes experts recommend protecting the DSP under the plaster from external moisture with damper layers of polyurethane foam, fastened with clamping rondoles (or other types of disc fasteners). This option requires elaboration regarding the fulfillment of the vapor permeability conditions for external walls. In winter, the dew point should not be allowed to fall on the inner plane of the CBPB.

Transportation and storage of CBPB

It is necessary to provide protection from atmospheric influences; long-term storage is possible exclusively in horizontal laying, but the CBPB is transported in the “edge” position.

Installation and surface finishing with cement-bonded particle boards (CSP)

Installation and surface finishing of DSP boards is carried out in the following order:

• Before fastening the CBPB sheet with self-tapping screws to the frame or base, it is necessary to drill holes for the screws, and the CBPB sheet must have a solid support along the plane (it is impossible to drill the CBPB “in weight”).
• Vertical cladding and cladding are usually made with slabs 16 mm and 20 mm thick.
• The most economical and fastest type of final finishing on DSP is painting with compositions based on acrylic, latex or silicone. Compensation gaps at sheet joints are required.
• DSP sheets are characterized by a very smooth surface and no porosity. Priming on the cemented sides of the sheets need not be done, provided the CBPB is not operating in a humid environment.
• Sealing of seams and joints of DSP is possible with sealants that mask the seams, and wooden, plastic or metal strips are used for finishing. This finishing is used to imitate facades in half-timbered styles, and in particular due to the excellent smoothness and geometry obtained when cladding with DSP, the appearance is simply ideal. The “picture” of the half-timbered structure is quite realistic and has its own charm.

For leveling for final finishing, DSP sheets are considered one of the best materials due to their good rigidity and ideal smoothness of the sheets. Finishing and leveling with DSP boards gives excellent results. Finishing materials can be paints and varnishes, plaster mixtures, facing tiles, wallpaper of any type, natural and artificial linoleums, laminates, cork, soft materials such as carpet and others.

Continuing the series of articles on the use of CBPB in construction, we present recommendations from manufacturers for processing CBPB (cutting, drilling, milling, grinding), fastening CBPB (using nails and screws, placing and making seams) and surface finishing (painting, plastering).

Let us remind you that cement particle boards (CSB)- a building material with unique properties used in “dry installation” technology. DSPs belong to a generation of modern composite building materials that have properties that combine the strength and durability of cement with the flexibility and ease of wood processing. The universal technical characteristics of DSPs have already been fully appreciated all over the world.

Modern slabs are made by pressing a molded technological mixture consisting of softwood chips (24%), Portland cement (65%), minerals (2.5%) and water (8.5%).

Options for using DSP boards for decorating the facades of buildings of any type are described.

Today on the Internet there is a huge amount of advice and recommendations for working with CBPB boards, but many of them do not correspond to reality. In order to figure out how to properly work with CBPB boards, we turned to the manufacturers' recommendations.

DSP PROCESSING.

Attention! To obtain a high-quality processed surface of cement particle boards, cutting tools made of hard alloys are used.

Cutting.
When cutting (cutting, trimming) cement particle boards on site, hand-held circular saws with a disk diameter of 250 mm and a number of teeth of no more than 40 are used. The rotation speed of the disk is 3000-4000 rpm.

To obtain a smooth edge, the cutting disc should protrude beyond the bottom surface of the slab to the minimum possible distance. The slabs are cut from the reverse side in order to preserve the front side from damage.

Drilling holes.
To drill holes in cement bonded particle boards, hand-held electric drills with electronic speed control are used. To drill single holes, you can use twist drills made of HSS cutting material; for long-term operation, drills made of carbide are recommended.

Milling.
For milling cement-bonded particle boards, hand-held electric milling machines with end mills equipped with carbide tips are used. The rotation speed of the cutting tool ranges from 25-35 m/sec.

Grinding.
Grinding of cement-bonded particle boards is not carried out at the JLLC "TsSP BZS" enterprise. In practice, when installing slabs, local irregularities may appear at the joints, which should be removed by grinding. For this purpose, hand-held vibrating, eccentric (orbital) or belt sanders are used. The grain size of the grinding material should be in the range of 40-80 units.

Attention! When grinding, the top finely dispersed covering layer is damaged, which leads to the opening of the structure of the slab, an increase in water absorption, and a deterioration in physical and mechanical properties. After finishing the treatment, it is necessary to apply primer to the slabs to stabilize the surface and reduce hygroscopicity.

When cutting, drilling, milling and grinding cement-bonded particle boards, a large amount of dust is released, so it is necessary to use dust suction devices and aspiration means.

MOUNTING OF DSP.

Attention! All connecting elements and metal elements of supporting structures must have an anti-corrosion coating. Before attaching cement bonded particle boards, it is necessary to ensure that the frame elements are vertical and horizontal and that they are in the same plane. All planes and edges of cement bonded particle boards must be primed before fastening. Particular attention should be paid to priming the edges.

Cement particle boards are attached to load-bearing structures using self-tapping screws and rivets (when attached to a metal profile).

In order to ensure technologically correct fastening of cement-bonded particle boards, the main requirement is to comply with the pitch between fasteners and the distances between them and the edges of the boards, according to the following diagram and table.

Holes for self-tapping screws and rivets are drilled into the DSP with a diameter 1.2 times larger than their own diameter. To deepen the heads of self-tapping screws and rivets, the holes are first countersinked to a depth 1.5-2 mm greater than the height of the heads.

To fasten the DSP without pre-drilling holes, you can use special self-tapping screws with a reinforced tip and a countersunk head equipped with blades to form a recess (countersink) to fit its dimensions.

Attention! The size of screws and self-tapping screws is chosen with the condition that the length of the pinched part is at least twice the thickness of the DSP board and at least 10 screw diameters. When tightening screws and self-tapping screws, do not use excessive force to avoid cracking the slab.

The table shows the minimum dimensions of screws and self-tapping screws used for fastening cement-bonded particle boards to elements of load-bearing frames, depending on its thickness and the diameter of the dowel of the hardware product.

Attention! When using cement particle boards for cladding walls, partitions and ceilings, it is necessary to lay them with a seam, the width of which is 6-8 mm for external use and 3-4 mm for internal use. The seam can be closed with an external strip, a wooden, tin, metal or polymer profile can be inserted, or covered with plastic putty based on acrylic resins or polyurethanes.

SURFACE FINISHING DSP.

Cement particle boards, like any wood-based particle boards, are subject to slight expansion and shrinkage under the influence of changes in temperature and humidity levels.

At the joints of the slabs, it is necessary to leave a gap for thermal expansion, allowing linear expansion of the slab. To prevent cracking in the joint compound, the width of the closed expansion joint should be 8 mm for external use and 4 mm for internal use.

The simplest is an open expansion joint.

Attention! Cement particle boards are supplied from the manufacturer with a moisture content level of 9±3%. Interim storage before processing, as well as installation, must be carried out in dry conditions. Failure to comply with this requirement may result in the boards absorbing an unacceptably high amount of moisture, which can lead to damage in closed seams and/or fastening areas, as well as damage to the paint coating on the surface of the boards applied at the work site.

The designs of the end faces of cement-bonded particle boards and joints are varied. The most common systems are presented below. When using cement bonded particle boards outside buildings and for cladding walls, it is not recommended to sand the surface of the boards (except in cases where the sanded surface is subject to special requirements). Sanded boards, in which the wood particles are directly visible on the surface, are generally used for flooring only (due to strict thickness requirements) and also in special cases.

.
Open expansion joint.

.
Open expansion joint with chamfered edges of the CBPB.

Closed expansion joint.

Using a floor strip.

Attention! Regardless of the methods used for surface finishing of cement bonded particle boards, mandatory priming of their planes and edges is required. The reverse sides of the slabs are primed before installation.

Painting of DSP boards.
The simplest and most common method of surface finishing of CBPB is painting with the formation of expansion joints between the slabs (open joints).

In this case, before applying paint to the surface of the cement bonded particle board, you must:
- deepen all screws 1-2 mm into the slab;
- clean the surface of the stove from dirt and dust. If there are grease or oil stains, they must be degreased;
- when cleaning wet, it is necessary to dry the slab;
- fill all cavities and chips with façade putty;
- after the putty has completely dried, sand the putty areas;
- clean and prime the front side and edges of the cement bonded particle board (stabilizes the surface, reduces hygroscopicity, unifies the base);
- paint the slab.

Attention! Paints and varnishes must contain pigments that are stable in an alkaline environment. Unstable pigments can lead to variations in color shades.

Filling expansion joints with elastic putties.
Expansion joints are filled with elastic putties based on acrylic resins and polyurethanes. Silicone putties are not used for cement-bonded particle boards.

The main rule for the operation of an expansion joint is the exclusion of three-sided contact in the joint, which causes uneven loading of the elastic filler with its subsequent separation from the edges of the cement-bonded particle boards.

To do this, use liners made of polyethylene tape or cord made of foamed polyethylene, which allows the elastic filler to adhere only to the opposite edges of the cement-bonded particle boards and evenly distribute the load on the filler.

Closed expansion joint made of elastic putty with a liner made of polyethylene tape.

Closed expansion joint made of elastic putty with a liner made of foamed polyethylene cord.

Plastering works.
Plastering work on cement-bonded particle boards is carried out with an open seam and a seam closed with a finishing system or flashing strips.

Plastering work is carried out in cases where the surface of the slabs should look monolithic and smooth, without visible expansion joints. As is known, with a change in relative humidity, elongation or shrinkage of CBPB boards occurs. To ensure that these changes do not affect the appearance of the plastered surface and do not lead to the formation of cavity (hairline) cracks, it is necessary:
- attach previously primed slabs to the structure;
- fill the resulting expansion joints with elastic putty;
- perform flat putty on the working surface;
- press an alkali-resistant fiberglass mesh into the resulting coating layer;
- apply a leveling layer of putty;
- perform final (finishing) surface finishing.

Facing cement particle boards with ceramic tiles or decorative stone.
When facing the working surfaces of cement bonded particle boards with ceramic tiles or decorative stone, elastic mastics must be used to fasten them and fill expansion joints.

It is recommended to apply adhesive mastic to the entire working surface of the slab. It is recommended that expansion joints between slabs be drawn out, ensuring that they coincide with the joints of ceramic tiles and decorative stone. Otherwise, ceramic facing tiles or a decorative stone element that overlaps the joining slabs should be glued only to one of the slabs, leaving the overlap area without adhesive mastic.

In rooms with insufficient ventilation for structures with constant water load (bathtub, shower), pre-primed cement-bonded particle boards should be used, followed by applying waterproofing putty to them.