Installation of sandwich panels is carried out using self-drilling, self-tapping screws for fastening, also called self-tapping screws for sandwich panels. It is important to calculate required quantity fasteners for installation.

How to do it? The exact number of fasteners must be determined by the designer. For a correct dawn, it is important to pay attention to the following key factors:

• type of sandwich panels (corner, frame or roofing);
• potential loads (natural external factors);
• installation direction (vertical or horizontal);
• facade or roofing work.

This article discusses in detail the calculation formulas optimal quantity fasteners. Also taken into account possible violations panel connections when contacting table screws, such as:

• destruction of the casing;
• slice;
• formation of dents;
• breakout and others.

It is extremely important to take into account the potential loads at dawn. In this regard, on the same panel in different conditions may be required different quantities fasteners.

The installation guide for sandwich panels from Teplant provides practical advice regarding the number and location of fasteners. Due to potentially high wind loads, it is recommended that 3 to 5 self-tapping screws be installed on the corner panels. The total number of fasteners must be indicated in the design documents.

Optimal number of screws:

When installed on a wall.

Panel location.

The minimum number of fasteners over the main area is 2.

Along the edges - 3.

On the extreme runs - 3.

On corner sandwiches along the edges - 3.

This example is based on a panel thickness of 0.5 mm.

This section contains installation instructions for you., storage, transportation, loading, unloading products of JSC "Profstal".

Installation, transportation, storage and operation of sandwich panels

REQUIREMENTS FOR OPERATION AND INSTALLATION OF PRODUCTS

General characteristics.

1. Installation of sandwich panels must be carried out in compliance with all norms and rules, in accordance with the developed work project. Before installation, it is necessary to visually inspect the sandwich panels to ensure they match in color and size.


2. Before starting installation, you must measure metal carcass and check it for accuracy in accordance with the project. Check the squareness of the surfaces of the walls, roof slopes along the axes and outer edges of the frame. It is recommended to mark the future location on the frame of the sandwich panels.


3. Before installation, it is necessary to clean the surface of the sandwich panels and connecting locks from possible contamination that could interfere with installation. Remove the protective film from the metal sheathing of the sandwich panels, and also cut the necessary panels, if provided for by the project.


4. To cut sandwich panels, it is recommended to use saws or jigsaws with a fine tooth profile. For working with tin shapes, use hand scissors. To avoid damage to the coating, cut sandwich panels on stable supports lined with soft material.


5. To avoid melting of the mineral wool board in sandwich panels, the use of gas-flame cutters during cutting is NOT allowed.


6. It is recommended to start installation of wall sandwich panels from the rightmost or leftmost bottom panel.


7. Sequence of installation of sandwich panels on the frame, fastening drainage systems, sealing of joints should be carried out in accordance with the working documentation of the project of the facility being built, the features of its architecture and design.


8. When moving sandwich panels around a construction site or on site, as well as when installing and finishing joints, it is necessary to avoid impacts on the surface of the panels. Joining tin shaped elements should be done with a rubber mallet.


9. During installation, it is prohibited to attach to sandwich panels. technological equipment, stairs, fittings, etc. All necessary fastenings must be made only to the supporting metal frame.


10. Installation of sandwich panels to a metal frame is carried out using special stainless steel self-tapping screws with sealing gaskets. To improve the strength characteristics of the installation, it is necessary to use only high-quality self-tapping screws, which must correspond to the purpose of the object in length, galvanizing class and other characteristics. Such self-tapping screws of the brand "GUNNEBO "as a set for sandwich panels can be purchased at Profstal JSC. (Table 14)


11. For installation to wooden purlins, self-tapping wood screws should be used.


12. The width of the intermediate purlin flange for supporting the sandwich panel should not be less than 60 mm. The width of the outer purlin flange should not be less than 40 mm. These rules apply unless otherwise provided by the design documentation of the facility.


13. Installation of sandwich panels is carried out using a clamp - a lifting mechanism with special grips. The number of grips is determined depending on the thickness and length of the sandwich panel. When laying horizontally, install the sandwich panel on the guides so that it presses the insulation with its own weight. At vertical layout After installation at the installation site, the wall panel must be pressed so that the locks fit tightly together. Using clamps installed sandwich panel pressed against the columns. It is necessary to ensure that the surface of the panel or its locks are not damaged by the clamp. Check the installation using a level.


14. After fixing with clamps, attach the sandwich panel to the structure.


15. Install between the support and the sandwich panel sealing tape.


16. Avoid any gaps in the panel joints. Joints along the axes between adjacent panels should be sealed with mineral wool or polyurethane foam.


17. Mount shaped products according to standard connection diagrams. The pitch of self-tapping screws is 0.3-0.4 m, the pitch of blind rivets is 0.3 m.


18. Protective film must be removed from shaped products immediately before installation.


19. It is not recommended to carry out installation work when strong wind, as well as during precipitation, fog and other unfavorable climatic conditions.


20. When cleaning the surface of sandwich panels from dirt, you should use a neutral detergent that does not contain abrasive components.

Table 14. Fastener identification

INSTALLATION OF SANDWICH PANELS

Preparatory work.

1. A thorough study of the layout of wall and roof sandwich panels. Determining the installation sequence.


2. Detailed familiarization with the drawings of individual fastening units of sandwich panels to load-bearing structures.


3. Preparation and alignment construction site for storing sandwich panels.
   


4. Arrangement and sorting of packs of sandwich panels according to markings and location on the facade (for ease of installation of panels and minimal relocation of the crane). Marking the location of panels on the supporting structure of the building.
   


5. Installation of auxiliary scaffolding and additional mounting equipment.


6. Organization of a construction site for the installation of a crane and its unhindered movement.
   


7. Checking the metal frame for accuracy in accordance with the design and straightness of the structure.

*Development project documentation The installation of sandwich panels is carried out by a specialized design organization. Installation of sandwich panels is also carried out only by specialists.

Required Tools and devices for installing sandwich panels.

1. Soft slings 10 m long, with a lifting capacity of 5 tons - 2 pcs. (Fig. 1).
   


2. Spacers to prevent damage to sandwich panel locks - 2 pcs. (Fig. 2).


3. Traverse (Fig. 3).


4. Clamp with clamping action for lifting and transporting the sandwich panel to the installation site (Fig. 4).


5. Scaffolding For installation work at the required height (Fig. 5).


6. Tools for installing sandwich panels (Fig. 6).

Rice. 1. Soft slings

Rice. 2. Spacers to prevent damage to sandwich panel locks

Rice. 3. Traverse

Rice. 4. Clamping clamp

Installation features.

1. Installation of sandwich panels must be carried out in compliance with the rules and regulations for the installation of this type of structure, taking into account the height and features of the metal frame of the building. For high-quality installation it is also important to observe temperature regime For auxiliary materials(sealants, polyurethane foam).


2. To cut panels, it is recommended to use saws or jigsaws with fine tooth profiles, circular saw- a diamond disc, and for work on tin - hand scissors. To avoid damage to the anti-corrosion coating when processing and cutting panels, it is prohibited to use abrasive cutting tools. Panels are cut on racks lined with soft material (to avoid damage to the coating).


3. Not allowed:

• lift the panel only by the top trim;
• leave the panels unfastened or clamped in a clamp during breaks in work (the panel must be secured with self-tapping screws, only then remove the clamps);
• attach to sandwich panels attachments(air conditioners, ladders, lifting equipment, etc.) All of the above must be attached only to load-bearing elements metal frame).

Installation of wall sandwich panels

1. At a distance of 1/4 - 1/5 L from the edges wall panel secure the clamps, equally distributing the center of gravity.


2. When installing long panels, it is recommended to use a crossbar. The length of the panel at which the use of a traverse is mandatory is determined depending on the type of terrain, wind area, building design features and other characteristics.


3. In addition to a clamp or traverse, the panel can additionally be secured with a special cable for stabilization during lifting. When delivering the panel by crane to the installation site, align it according to the pre-applied marks. Install the first panel at a distance of 20-30 mm from the base (Fig. 1). When attaching the panel to the installation site, be sure to check the installation for verticality and horizontality. The position of the first panel requires especially careful checking, since the correctness of the further installation of all panels depends on this.


4. When laying horizontally, install the second, third and subsequent panels on top.


5. When laying vertically, install from the corner, starting from the first panel. Installation should also be carried out with a gap of 20-30 mm from the base.


6. After every third panel, it is necessary to check the entire structure for correct installation.


7. When installing, a gap of at least 20-30 mm must be left between the roof and wall panels (Fig. 2)


8. When attaching each wall and roof panel with self-tapping screws to the frame structure, you must first mark the attachment points for all the screws on the panel, then fasten.


9. Removing the clamps from the panel should only be done AFTER the panel has been securely fixed to the frame using self-tapping screws.


10. To avoid damage lock connections wall panels - do not use excessive force when joining the locks.


11. For effective operation of the structure, it is important to follow the rules for fastening screws (Fig. 3). Increasing the distance in the vertical joint of panels with a horizontal layout by more than 40-45 mm is not desirable. This is due to the fact that after installation of the wall panels, all joints will be closed with shaped elements, the dimensions of which are designed to close the joints between the panels along with self-tapping screws. If the distance increases, the screw head will interfere efficient installation shaped elements. The number of self-tapping screws for sandwich panels is calculated on average to be 3-4 self-tapping screws per panel at the point of attachment to the girder, or the point of attachment to the column.


12. When installing wall panels horizontally, it is important to ensure the correct direction of the locks (Fig. 4).


13. The screws must be tightened until the bending of the metal casing is eliminated. But at the same time, excessive pressing of the screw and jamming of the outer skin of the panel should not be allowed (Fig. 5). To give the sandwich panel façade an aesthetic and neat appearance, a possible location for installing the self-tapping screw is in the deflection of the rib (pattern) of the wall sandwich panel. This rib is applied to the panel skin in 100 mm increments to give additional rigidity to the wall panel. The spacing of fastening screws along the rib is 300 mm (every third rib). The consumption of self-tapping screws in this case for each run is 4 pcs. (Fig. 6).


14. When installing the wall panel, there should be a gap of up to 2-3 mm in the locks (Fig. 7 a, b). Correct connection is determined by the tight pressing of the insulation along its entire length at the joint between the two panels (Fig. 8).


15. Window cutting and doorways carried out locally, when installing the panel. It is necessary to take into account a gap of 20-30 mm between the panels and the windows, door blocks. If it is impossible to cut an opening in the panel after attaching it to the frame (equipment is in the way, a metal structure is located nearby), cut the opening at flat surface on special linings before lifting it to the installation site (see paragraph 2 of section 7.2.3. Installation features).


16. Lift a panel with a cut-out opening to the mounting location with extreme caution, since the panel no longer has its original strength.

Rice. 1. Fastening sandwich panels

Rice. 2. Fastening roof and wall panels

Rice. 3. Fastening sandwich panels with self-tapping screws for horizontal and vertical layout

Rice. 6. Fastening the wall panel with self-tapping screws

Installation of roofing sandwich panels

1. To ensure a reliable connection with the next panel, installation of the first roofing panel must be carried out with an open wave towards the eaves (edge) of the roof.


2. At a distance of 1/4 - 1/5 L from the edges of the roofing panel, secure the clamps, equally distributing the center of gravity. The pressure plate of the clamp should be located in the space between the first and second waves of the top sheathing of the roof panel (Fig. 1).


3. When installing long panels, it is recommended to use a crossbar. The length of the panel, at which the use of a traverse is mandatory, is determined depending on the type of terrain, windy area, building design features and other characteristics.


4. Feed the panel with a crane and secure it with a cable above the installation site.


5. Align the extreme eaves overhang of the panel to the distance specified in the project.


6. Align the panel at the installation site, check the parallelism of the panel end relative to the building facade and the ridge.


7. Secure the panel to the supporting structure in the lower deflection of the wave with self-tapping screws. The overlap of the corrugation in the lock of the two panels is fastened together with a blind rivet with a pitch of 300 mm (Fig. 2).


8. Number of screws for installation roofing panels count 3-4 pieces at the points of attachment to the purlins.


9. When installing the roof panel, there should be a gap of up to 2-3 mm in the locks. The correct connection is determined by tightly pressing the insulation along its entire length at the junction of the lock of the two panels (Fig. 2a).


10. The transverse overlap of two roofing panels should be carried out locally during installation by trimming the lower sheathing and removing the insulation of the overlying roofing panel by 300-500 mm (Fig. 3). To ensure a tight fit of the upper corrugation in the transverse joint, it is necessary to remove any remaining adhesive from the insulation after removing the insulation. inside sheathing manually. The length of the overlap (lap) for the transverse joint of roofing panels on long-span roofs must be specified at the design stage.


11. When installing the roof panel, a temperature gap of up to 2-3 mm should remain in the locks. The correct connection of the panel is determined by the tight pressing of the insulation along the entire length at the junction of the lock of the two panels.

Attention! In the future, when using a roof made of sandwich panels in winter and off-season, the roof must be regularly cleaned of snow!

Installation of shaped elements

1. To achieve optimal performance properties of an object made from sandwich panels, as well as to give it a complete aesthetic appearance, shaped elements are used.


2. Shaped elements according to appearance, length, configuration and purpose are determined at the design stage and manufactured in accordance with the catalog of Profstal JSC. The optimal overlap of shaped elements during installation is 100 mm.


3. Vertical installation shaped elements on the façade must be started from the bottom up. At the junction of the shaped element and the panel, where water penetration is possible, it is necessary to apply a sealant for external use. This will provide additional sealing of the joint and optimal performance characteristics building.


4. At the ridge joint of roofing panels, it is recommended to use a double ridge shaped element - the large ridge itself (KB 450) and the reverse (internal) strip - the reverse lower ridge (KON 300) (Fig. 1). It is recommended to install the lower (reverse) ridge BEFORE installing the roofing panels, since it is directly adjacent to the purlins and the roofing panels are laid directly on it (Fig. 2). After installing the roofing panels, fill the gap with mounting foam, sealing mastic and insulation. Close the joint with a large upper ridge (KB 450).

Work to complete the installation of sandwich panels.

After completing the installation of the panels, it is necessary to remove traces of contamination with non-aggressive detergents(soap solution). Removing dirt using abrasive and aggressive means is not allowed.

Areas of paintwork damage must be treated with a spray to eliminate defects in the corresponding color according to the RAL catalogue.

Rice. 1. Construction of a double ridge shaped element

Rice. 2. Ridge joint of roofing panels along purlins

GENERAL RULES FOR CARE OF PANELS

When using a roof made of sandwich panels, you must move on special scaffolding and remove snow from the roof with care without damaging the paintwork.

At least once a year, conduct an external inspection of the panel coating and fasteners. Damage occurred paint coating must be treated with a spray to eliminate defects in the corresponding color according to the RAL catalog.

Contamination of the coating that occurs during operation is washed off with a soap solution and then washed off running water. Solvents must not be used chemical compositions, abrasives.

PACKING, LOADING - UNLOADING, TRANSPORTATION OF SANDWICH PANELS

Sandwich panel packaging

1. Sandwich panels produced by Profstal JSC are formed into packages. The package consists of sandwich panels stacked on top of each other. Sandwich panels are stacked horizontally on top of each other in bags. If the panels are of different lengths, then the panels of the longest length are laid first, and sandwich panels are laid sequentially on top - each shorter than the previous one (Fig. 1). To protect panels from damage and impact environment the package is placed on polystyrene foam blocks and wrapped plastic film(Fig. 2, p. 55).


2. To transport sandwich panels by road, packages with sandwich panels are placed on polystyrene foam bars in stretch film; to transport sandwich panels by rail, packages of sandwich panels are placed in shipping boxes on wooden pallets.


3. The pallet consists of longitudinal boards 25x150 (180), transverse bars 75x110, straps 40x150, tightening metal tape and backing boards 25x75.


4. For transportation of sandwich panels by rail it is used wooden box. For ease of unloading and at the request of the client, sandwich panel packages are equipped with metal slings. The number of sandwich panels on a pallet or in a box and the height of the package depend on the thickness and type of sandwich panels (Table 15).

Rice. 1. Layout of sandwich panels in bags

Table 15. Packaging characteristics of sandwich panels

Fig.2. Scheme of the sandwich panel packaging process

RULES FOR LOADING AND UNLOADING SANDWICH PANELS

1. Work on loading and unloading sandwich panels should be carried out exclusively by mechanization.


2. Packages of sandwich panels should always be moved only one at a time.


3. When loading packages with panels, textile slings of appropriate load capacity should be used. To make it easier to unload panels from railway transport It is allowed to complete boxes with metal slings. It is also necessary to use corrugated cardboard for laying between the board and the sandwich panel to prevent damage to the paintwork due to friction of the board on the panel.


4. When loading packages with panels into vehicles, protect the packaging from contact with power elements sides of cars.


5. Unloading of packages should be carried out with any type of crane of appropriate lifting capacity, and care should be taken that the slings are located on the slings (Fig. 1).


6. Only “top” loading and unloading of sandwich panels into transport is possible.


7. Textile slings should not touch the sandwich panels. Otherwise, damage to the locking area of ​​the sandwich panels may occur. When lifting, pay attention to the center of gravity of the package.


8. When unloading, it is necessary to prevent the packaging from being dropped.


9. Packages should be unloaded onto a flat, pre-prepared surface (storage area).


10. Packages with panels must not be pushed or pulled.

1. Sandwich panel packages are transported by all types of vehicles in accordance with the cargo transportation rules in force for each type of transport.


2. Transportation should be carried out ONLY in packaged form.


3. To transport sandwich panels, trucks with a body in the form of a flat open platform or a tilt body with an opening top for loading and unloading are used. IT IS NOT ALLOWED to transport packages with sandwich panels by specialized vehicles intended for other types of cargo (vehicles for transporting timber (timber trucks), crushed stone, stone, concrete, for transportation passenger cars, as well as closed vehicles - “booths”, “butterflies”, buses, etc.)

• The body must have eyelets for attaching packages with sandwich panels. The length and width of the car body must be no less than the length and width of the transported packages with a margin of 2-3 cm. Transported packages can be stacked in 1 or 2 tiers when loading.


• Special textile tapes are used to secure packages during transportation. The packages are fastened to the vehicle body in increments of an average of 1.5 m.


• When loading, each sling must be placed under a sling board (Fig. 1).


• During transportation, the driver must periodically check the stability of the load and the tightness of the bundle. If the ligaments are loose, they need to be tightened. To avoid damage to the sandwich panels, the packages are not allowed to come into contact with elements of the car body.

When transported by rail or river (sea) transport, sandwich panels must be packed in wooden boxes.

• The boxes are loaded into a gondola car and secured with wooden wedges. When loading, it is necessary to take into account the height of the boxes of the upper tier and the height of the wall of the gondola car: the top box should not protrude more than 1/3 of its height above the upper edge of the gondola car.


• The dimensions and design of the boxes depend on the type and size of the sandwich panels.


• When loading boxes onto river (sea) transport, they must be secured to the surface of the transport (deck) with slings or steel cables to special fastening eyes for securing loads. It is recommended to load in one tier.

Loading packages with sandwich panels onto a load already in the back of the transport vehicle, or under another load, is PROHIBITED. This will inevitably cause damage to the sandwich panels.

In transport, on the surface of the floor or walls of the body, there should be no sharp elements, nails or other elements.

Protruding parts of the body, which can damage packages with sandwich panels during transportation, must be properly separated from the packages with polystyrene foam blocks, plywood or cardboard spacers.

For proper installation of a sandwich panel, you need to select a self-drilling screw (self-tapping screw for a sandwich panel) required length. As a rule, the length of the self-tapping screw is determined by the formula: panel thickness + drill length + frame thickness + 5 mm. The most widely used self-tapping screws are with a drill length of 14–15 mm, which allows drilling a frame up to 15 mm thick. To simplify calculations, it is assumed that the panel is mounted on a frame with a wall thickness equal to length borax. For example, for fastening a sandwich panel with a thickness of 150 mm. You will need a self-tapping screw of the following length: 150 mm. + 15 mm. + 15 mm. + 5 mm. = 185 mm. In the calculation, the doubled length of the drill implies not only the ability of the self-tapping screw to drill through the frame, but also the ability to secure it with a thread along the entire thickness of this frame. Additional 5 mm. in the length of the screw - this is a factor that takes into account the presence of a sealing washer with a thickness of 3 to 5 mm.

The quality of a self-tapping screw for a sandwich panel is determined not by the hardness of the surface or the ability of the drill to drill through the frame, but by the degree of its plasticity, in other words, its ability to withstand swaying caused by thermal expansion of sandwich panels. During the production process, all self-tapping screws go through a hardening stage, after which they become hard but brittle. The fragility of the self-tapping screw is reduced by a metallurgical process called tempering. Due to the fact that the tempering process itself takes a lot of time and, moreover, may be accompanied by a slight decrease in hardness, manufacturers from Southeast Asian countries neglect it. Therefore, self-tapping screws for sandwich panels made in China or Taiwan often have their heads “cut off” during the installation of panels, and the self-tapping screw itself breaks when trying to bend it even by 10 - 15 degrees.

It is important that there is a second (supporting) thread under the head of the self-tapping screw. It serves to maintain the outer cladding of the sandwich panel and prevent it from collapsing from snow load or from pressure caused by people walking on the roof. There is no denting of the panel surface in the installation area of ​​the self-tapping screw - no roof leaks. However, it must be borne in mind that the second thread must have sufficient large diameter(ideally - at least 7.4 mm.). The pitch of the second thread should repeat the pitch of the main thread of the self-tapping screw and the second thread should break off sharply, not reaching approximately 3-4 mm. before inner surface screw heads. Otherwise, i.e. if the diameter of the second thread is from 6.3 mm. up to 7.0 mm., the second thread reaches the inner surface of the screw head and its pitch differs from the pitch of the main thread, then during the installation process, when the outer cladding of the panel has already moved along the second thread under the sealing washer, and installation of the main thread of the sandwich screw panels in the frame are not yet completed, a couple of turns of the self-tapping screw is enough to flare the hole in external cladding panel to the diameter of the second thread and loss of its supporting functions.

The diameter of the sealing washer for installation of roofing screws must be at least 19 mm, for installation of wall panels - at least 16 mm. The sealing seal of the washer is EPDM ( synthetic rubber). Better quality - light gray, soft to the touch, approximately 3 mm thick. Less quality are hard seals in black and dark gray. Most preferred material The washer itself is made of aluminum and its alloys, because these metals are more ductile than galvanized or stainless steel and in the final installation steel of the self-tapping screw, when the installation site is sealed, the aluminum washer, slightly deforming, evenly distributes pressure on the EPDM sealing gasket and at the same time the surface of the panel does not dent, as happens with the use of more rigid washers made of carbon or stainless steel.

Kinds protective coatings Self-tapping screws for sandwich panels are different. The simplest and most common type is electrolytic galvanizing (white zinc), which is the cheapest and most unstable of the protective coatings used. A higher class is XULAN coating, an even higher class is RUSPERT, and RUSPERT comes from I to III class resistance (the higher the class, the greater the anti-corrosion resistance). To date best characteristics DUROCOAT coating resists corrosion and protects self-tapping screws and structures from rust.

When choosing self-tapping screws for installing sandwich panels, you need to know exactly what complexity of building you are going to install. For simple garage, a small security booth, shopping pavilion on the outskirts of the city or just an extension up to 3 meters high, it is possible to use cheap low-quality self-tapping screws made in China or Taiwan - due to the low price of such products, it is possible to install more of them than required (usually from 1.8 to 2.2 self-tapping screw/sq.m.) and avoid possible collapse of the panels due to a self-tapping screw breaking during operation. When installing a more complex building, or when installing roofing panels, saving on self-tapping screws can lead to future roof repairs or the fall of wall panels (which has already happened in Moscow and some other Russian cities).

You can protect yourself from purchasing Chinese or Taiwanese screws passed off as German, Polish, Finnish or Swiss by asking the seller for a certificate of origin of the self-tapping screw, certified by the seal of the chamber of commerce and industry of the manufacturing country (do not confuse it with the certificate of conformity issued in Russia). By the way, a certificate of conformity is not a quality certificate, since it does not confirm the quality of the product, but only indicates compliance of some parameters of the self-tapping screw for a sandwich panel with the requirements of certain points current GOST. But few sellers have heard anything about certificates of origin. Therefore, the easiest way to protect yourself from counterfeits or low quality is to pay attention to the packaging - respected global manufacturers package their products in durable carton boxes clear geometric shapes 100 pieces each, and the boxes themselves have a visual identification (manufacturer’s logo, etc.) printed by printing method, as well as a sticker with a barcode indicating the country of origin. If you are offered self-tapping screws in industrial corrugated packaging, 250 - 800 pieces each (depending on the size of the screw), if there is no printed identification on the boxes, if the destination port Kaliningrad, St. Petersburg, Hamburg, Amsterdam is indicated on the stickers, if the number is indicated contract, there is no barcode and country of manufacture, then you should know that they are trying to sell you self-tapping screws made in China.

During construction, you can try and save on self-tapping screws for the sandwich panel, but you will have to take on all the risks that arise.

Unfortunately, few wholesalers, much less retailers, of self-tapping screws for sandwich panels can sensibly and intelligibly, and most importantly, without concealment, talk about the product they offer. You alone will have to make a decision about which self-tapping screw to use for the sandwich panel - cheap, but of poor or questionable quality, or expensive, but reliable.

Sandwich panels are often used in the construction of structures of varying complexity. Thanks to them, the construction process can be accelerated, and the energy efficiency of the building also increases, since such panels already contain insulation.

For installation you need to prepare special fasteners. Among them are self-tapping screws for sandwich panels.

Properties of self-tapping screws and requirements for them

Special fastening panel elements have the following properties:

• they are able to reliably fix materials regardless of the time of year;
• the plate can be successfully fixed to any material;
• Since they are practically invisible on the structure, its aesthetic appearance is guaranteed after installation.

You should also know that self-tapping screws intended for such structures must meet the following requirements:

• ensure reliable connection between the panel and different materials;
• during installation, the surface of the product should not deteriorate under the influence of self-tapping screws;
• tightness must be ensured at fastening points;
• fasteners must be resistant to seasonal changes material.

Composition of fasteners

Self-tapping screws for sandwich panels consist of the following elements:

• grounds;
• tip;
• heads with six sides.

Externally, the base is divided into three parts. Immediately behind the head there is a thread, and then there is a smooth part, at the base there is again a thread. During the installation of structures, the smooth middle of the fastener goes into the panel itself.

The fastening element also comes with a washer equipped with rubber gasket. It is needed to protect the hole from liquid penetration, making the mount sealed.

Types and sizes of fasteners

You need to choose one or another self-tapping screw depending on the thickness of the structure:

• the length of the fastener must be greater than that expected to fit into the box;
• The material used to make the self-tapping screw must be able to maintain its strength and integrity when screwed in for as long as possible.

You cannot skimp on fasteners for sandwich panels. Cheap fakes may lose the integrity of the thread during installation.

When choosing self-tapping screws, the coating is of no small importance. The fasteners themselves are made primarily from carbon steel, the coverage looks like this:

When installing sandwich panels, you should choose the right fasteners. The length of the screw should be 85-285 mm. Be sure to take into account the thickness of the metal profiles and panels themselves. If the mount has a diameter ranging from 5.5 to 6.3 mm, then the metal frame should have a cross-section from 1.5 to 15 mm, respectively. The panels themselves should have a thickness of 17 to 240 mm.

The length of the fastening element is calculated by summing the thickness of the panel, metal profile, thickness of the gasket (it is 5 mm) and the length of the drill.

GOST standard

When installing sandwich panels, builders often use self-tapping screws equipped with a countersunk head and a pointed end; they comply with the GOST standard 11652–80. Such products are convenient and durable in terms of use and they are highly effective.

According to the existing standard, such a fastener is equipped with a pointed end and has strength class B. The thread can have a diameter ranging from 2.5 to 8 mm. The standard also allows for the production of self-tapping screws not only based on metal, but also on plastic.

Rules for installing sandwich panels

Before you begin the installation process, you should calculate their number for future work. For this purpose, it is necessary to take into account the placement of panels and their sizes. Do not skimp on fasteners by trying to make the step wider, since in this case you need to provide the material with maximum strength, taking into account atmospheric and mechanical loads.

Fastening must be done at a distance of at least 30 mm from the edge. Use two self-tapping screws with a pitch of 900-1200 mm for each of the columns. Depending on this value, and also taking into account all possible loads, the average consumption of self-tapping screws will be calculated:

• if the panel has a length of 6 m or more, then to attach it you need to prepare about 8 screws;
• if it is shorter than 6 m, then 6 fastening elements will be needed;
• and only 4 fasteners will be needed to mount a panel up to 4 meters long.

Structural installation process will differ depending on what material was used to produce the frame:

If knots are formed during the connection of adjacent sections, they can be sealed using special sealing foam or mineral wool. The span of structures affects the size of the joints. If it is less than 4 meters, then the seam will be about 15 mm. If the span is longer, the indicator will increase to 20 mm or more.

Manufacturers of self-tapping screws

The cost of installing sandwich panels using special self-tapping screws depends on whether you will do it yourself or use the help of hired specialists. Doing it yourself will cost much less, but remember that it is better not to undertake it if you do not have the proper experience.

As already mentioned, there is no need to save on purchasing self-tapping screws. You should not buy suspiciously cheap fasteners, they can quickly break.

• "Harpoon".
• SFS intec.
• "Scorpion".

During the construction of buildings wall and roof sandwich panels with mineral wool insulation mounted on a metal frame using special self-tapping screws with a rubber seal.

They are used for direct installation of sandwich panels on steel structures. These self-tapping screws are made from hardened carbon steel. The surface of the screw is galvanized. The self-tapping screw has a hex head and a drill tip. The drill length (drilling depth) is usually 12.5mm. The diameter of the main thread is 5.5 mm, the diameter of the thread under the screw head is 6.3 mm. The self-tapping screws are equipped with a 19mm washer with an EPDM gasket. Pre-drilling of the panel and structure is not required. Minimum thickness steel structure for fastening with a 1.5mm self-tapping screw. Using a special tool - a screwdriver, the panels are secured to the building frame with self-tapping screws. Gaskets provide a tight seal of this mount from external climatic influences.

A polyurethane sealing tape is laid between the frame and the panels.

Please note that when sandwich panels are laid out horizontally, the heads of the self-tapping screws are hidden by strips, and the self-tapping screws themselves are located in the body of the panels, so they are not greatly affected by environmental aggressiveness

Recommended distance from the edge of the panel to the axis fastening element is at least 25 mm, regardless of the thickness and length of the panel. I am enclosing the assembly for fastening the TSP to the metal structure and the fastening diagram from the technical catalog.

Self-tapping screw 5.5xL OTs – for fastening sandwich panels to metal structures up to 14 mm

Does not require pre-drilling a hole - reducing panel installation time.

Additional thread (under the screw head) - rigidly maintains the distance between the panel facings - increases the density and efficiency of the connection.

Hex head for 5/16 (8 mm) bit, 16 mm drill bit

Material – steel C1022 - electro-galvanized

L – length, mm

L1 – thread length under the self-tapping head – (13-15) mm

L2 – main thread length – (54-56) mm

P1 and P2 – thread pitch – 0.81 mm

D – inner diameter self-tapping screw – 4.4 mm

D1 – outside diameter threads under the screw head – (6.1-6.25) mm

D2 – outer diameter of the main thread – (5.31-5.46) mm

Dp – drill diameter – (4.4-4.5) mm

T – drill length – 8-9 mm

S – spanner size – 8 mm

6.3 (thread diameter under the screw head) / 5.5 (main thread diameter) x L

L - total length of the self-tapping screw, mm

Material - hardened carbon steel

Coating - zinc

Head - hexagonal

The tip is drill-shaped, drill length (drilling depth) 12.5 mm.

Equipped with a 19 mm washer with EPDM gasket.

EPDM washer diameter (19 mm)

Fastening pitch: for wall panel - 400 mm; for roofing - 500 mm

For fastening sandwich panels to metal structures with a shelf thickness of up to 14 mm without pre-drilling.

The length (L) of self-drilling self-tapping screws Ø5.5xL is selected depending on the type and thickness of the sandwich panel according to the table.

sandwich panels	Minimum self-tapping length L, mm
	Sandwich panel with visible fastening	Sandwich panel with hidden fastening	Sandwich panel roofing

Self-tapping screw OF drill 16 mm (Manufactured by OhtaForm Germany)

7.0-10/6.3 -14 * L

L – screw length, mm

7 mm - outer diameter of the thread under the screw head

10 mm - thread pitch under the screw head

6.3 mm - outer diameter of the main thread

14 mm – main thread pitch

16 mm - drill length

With rubber gasket

Self-tapping screws DVA (Germany)

For fastening sandwich panels	For fastening laminated panels without pre-drilling
Drill No. 5 (12 – 14 mm) Longitudinal thread groove EPDM gasket Sealing steel washer D 14 mm Hex head – 8 mm	Reinforced drill No. 5 (22 mm); Longitudinal thread groove EPDM gasket Sealing steel washer D 19 mm Hex head – 8 mm Drilling capacity – 12 mm in 10 seconds
Supplied complete with steel washer		Acid resistant coating

"DVA", drill 16 mm (made in Germany)

"DVA Strong", drill 22 mm

Self-tapping screws made in Taiwan, drill 16 mm.

Self-tapping screw tip - enlarged drill PT No. 5, coating - zinc