In the world of modern construction, sandwich panels occupy a special place, playing a key role in creating high-quality, efficient and aesthetically pleasing structures. Their versatility and wide range of applications make them popular among architects, engineers and developers around the world.
We will look at the main features of sandwich panels, their structural advantages, manufacturing and use technologies, as well as specific properties that make them indispensable in the construction industry.
Features of sandwich panels
Sandwich panels are versatile materials for facade cladding and roofing. They are designed for quick installation, which makes them ideal for building prefabricated structures and creating roof and facade structures.
Thanks to these qualities, they are widely used in the construction of public and commercial buildings, such as shopping centres, business centres, fitness clubs, hotels, and production facilities.
To create a three-layer cladding, galvanised steel is used and an insulating material is placed between its layers. To protect the metal from corrosion, a polymer coating is applied - polyester with a matte or glossy surface. The customer can choose the desired colour from a wide range of shades.
The sandwich panel manufacturing process is carried out exclusively in a mechanised manner at factories equipped specifically for this purpose. The name of this building material is not accidental - it consists of several layers and is a kind of "sandwich".
There are metal sheets on top and bottom, with thermal insulation material between them. The thickness of the insulation material affects the thickness and cost of sandwich panels. The thickness of the steel sheets also affects their price.
For roofs, rather thin panels with 0.6 mm thick sheets are usually used, while for wall cladding, panels with metal sheet thicknesses of up to 1.2 mm are more suitable.
The dimensions of sandwich panels also affect their cost. The standard length of such products is 12 metres. However, if you wish, you can order panels of the required size. Their thickness can range from 40 to 250 mm. Depending on the profile, the width of the panels can range from 50 to 120 cm. Products with a small width are more often used for the construction of garage doors, while wide ones are used for the construction or cladding of such objects as warehouses, houses, garages, etc.
Three-layer sandwich panels are the most expensive due to their complex structure, increased strength and excellent performance.
What do you need to install sandwich panels?
The installation of sandwich panels is an important part of the construction process, especially when building walls, roofs or cladding industrial premises. Correct installation ensures not only an aesthetic appearance, but also effective insulation and resistance to weather conditions.
Before starting work, it is necessary to ensure that the necessary tools and materials are available to ensure that the installation process goes smoothly and efficiently, namely:
Make sure you have all the necessary tools and materials before you start installing the sandwich panels. This will help ensure a quality job and increase the efficiency of the construction process.
Sandwich panel installation technology
When installing sandwich panels, it is important to adhere to a specific technology and workflow, as this determines not only the quality of workmanship, but also the durability and efficiency of the structure.
Regardless of whether sandwich panels are used for wall, roof or interior cladding, proper installation ensures optimum thermal insulation, durability and protection against negative environmental influences.
The correct sandwich panel installation technology ensures not only efficiency and structural strength, but also durability and reliability of the building or structure.
Adherence to established procedures and algorithms helps to avoid quality problems and ensure optimal performance. Below, we will look at this process in more detail.
Preparatory work
Before starting the installation, you need to develop a plan of sandwich panels location at the facility. It is important to take into account the variety and brand of panels, as well as the possibility of transporting them to the installation site with minimal use of scaffolding and small crane movements. The lifting of the panels should be unhindered.
Technical preparation involves providing design and installation documentation. You must collect:
It makes sense to entrust the preparation of design and installation documentation to companies specialising in such work. This will help to avoid possible mistakes.
All manipulations with the building frame must be completed before the panels are assembled. It is also important to check the supporting structures and supporting angles for compliance with the documents. This is the main condition for high-quality installation and repair work.
Another important point is the application of an anti-corrosion paint coating to metal parts in the areas where internal surfaces are joined. This must be done in advance, as painting after all the structures have already been built on site is difficult, and some areas may not be accessible for processing.
The assembly starts from the outside. For convenience, movable and stationary scaffolding is used, which can only be set up and moved after the area adjacent to the building has been levelled.
The minimum width is 2.5 metres. The gap between scaffolding and load-bearing structures should be at least 30 centimetres. This distance will help to avoid possible mechanical damage.
Lifting panels
Sometimes transporting and loading sandwich panels is seen as a disadvantage. In fact, organising the correct transport of the material is not that difficult. It requires careful adherence to certain rules.
The material should be transported exclusively in its original packaging on open-body trucks with a lift top. The vehicle body must be equipped with special lugs for securing the packages. When stacking, they should be limited to two layers.
During movement, packages should be fixed with special tapes that are attached every 1.5 metres. During the journey, the driver should regularly check the condition of the cargo (fixation, tension of the ties, etc.). When transported by sea or rail, the panels must be packed in wooden crates of appropriate dimensions.
It is not recommended to transport the material in vehicles that are not designed for panels, for example, in a car trailer.
The material is lifted to the required height using a vacuum-type hoist (this is a crane with suction cups). If such equipment is not available at the construction site, a conventional crane or winch can be used.
The lifting mechanism lifts the panels using:
Horizontal installation implies installation of sandwich panels in a vertical position. In this case, gaskets should be used, which are distributed along the entire length of the panel and do not lead to deformation of the locks.
In order to avoid deformation of the locks, it is not recommended to lift the panel directly from the pallet and to connect the panels at an angle. The connection of the panels should be strictly vertical. It is recommended to use the method with two mechanical clamps to avoid any damage.
Vertical installation of sandwich panels involves the use of a mechanical clamp, which is fixed through drilling holes in the sandwich panels. These holes can later be closed with shaped finishing or fastening elements.
Safety belts (slings) are used to secure the panels during lifting.
After the panel is installed in the design position, the straps can be removed, as the panel will be held by mechanical clamps.
However, the most optimal method is a traverse with vacuum suction cups. When using the traverse, the protective film is removed only where the vacuum gripper is attached.
Cutting and drilling sandwich panels
When building a house, it is unavoidable to adjust the panels to the required height and width. Before performing any drastic operations, it is important to calculate everything correctly, measure all elements carefully and only then start working.
It is recommended to check the evenness and horizontality of the marked lines with a building level (ideally, a laser or water level). First, cut the metal or cladding, and only then - the insulation itself.
It is important to note that the best tools for cutting panels are band or circular saws. For metal, you need to use special tools. In the absence of such tools, you can use an ordinary electric jigsaw.
Use a regular drill to drill holes. During work, it is important to remove metal chips from surfaces. If wood or polyvinyl chloride is used as a covering, it is recommended to use a jigsaw or a regular hand saw for cutting. The teeth of the tool should be of medium size.
Fastening of sandwich panels
The sandwich panels serve as load-bearing elements of the fence and are attached to a support structure. Each support structure is made of different materials such as concrete, steel or wood.
Self-drilling screws are the most suitable for attaching to steel or wood structures. Another option is carbon steel screws with a washer made of elastomeric insulation material.
The choice of fastener type depends on the type and thickness of the structure. When installing metal structures, it is important to consider the thickness of the panel. Particular attention should be paid to threaded connections and their load-bearing capacity. This capacity depends on: the type of screw, self-drilling screw, and the diameter of the screw and screw hole.
The distance between the edge of the panel and the screw should be at least 50 mm. The angle between the connecting components must be 90°. If these parameters are not met, the structure can be considered defective.
To fasten panels and shaped elements, you need to have special installation tools: a high-speed screwdriver, an electric drill.
Screws with a sealing washer are tightened to maximum compression. To prevent the sealing washer from deforming, set the screwdriver to the screw tightening torque.
Before fixing the panel to the wall (concrete), it is necessary to drill the panels and concrete structures. In this case, special dowels serve as an excellent fastener.
When attaching to a wooden wall, holes must also be drilled, but self-drilling screws are already used as fasteners.
In the case of fixing the panels to steel structures, self-drilling screws are used before drilling. To avoid pre-drilling, it is recommended to use self-tapping screws (self-drilling screws).
Remove any excess insulation before installation. Remove the protective film in the areas where the locks and screws are located. Only before the installation is complete, the film is removed completely.
Calculating the number of screws
The number of screws is determined individually. The designer should take into account:
Recommended screw arrangement:
The above are examples of screw locations suitable for fixing to mineral wool insulation panels in buildings up to 10 m high. The thickness of the mineral wool insulation is 120 mm.
In this case, the panel acts as a single-span beam and is laid out horizontally. If there are many such spans and the panels are of equal length, the number of screws is calculated individually.
Installation of load-bearing structures
The basic component of a high-quality installation is the support structures, the surface of which must be flat and free of defects. The designer must carefully calculate the maximum distance between the supports to ensure the stability and reliability of the installation, taking into account all factors.
This includes taking into account the exact weight of the panel, wind and snow loads, the type of building, the number of spans and even the colour of the panels, as this can affect their performance.
The best practice is to use a 2-4 mm thick self-adhesive sealing tape that should be securely attached to beams, rods and transoms - the outer surfaces of the supporting structures. This helps to ensure that the joints between the panels and the supporting elements are airtight, which is important to prevent the penetration of water or other harmful factors into the space behind the structure.
By taking all these factors into account at the design stage, installers can ensure the reliability and durability of structures using modern technologies and materials. Adherence to these criteria guarantees the efficiency and quality of the installation, which plays an important role in ensuring the long-term and safe operation of the building.
Installation of wall sandwich panels
The wall panels can be installed vertically or horizontally. For horizontal installation, work should start from the bottom (at the foot) and continue upwards. Vertical installation requires starting from the corner and the panel that will rest against the joint. If you follow these rules, the deviation in size will be almost invisible.
Horizontally, the panels were laid with a special level down so that water would drain off rather than accumulate. This is a mandatory rule.
The panel must be lifted (using a lift) and installed on the basement support structure prepared by the project. Then check the panel for verticality and the wall for flatness. If necessary, align the first panel and its position. The accuracy of its position will determine the correctness of the entire installation.
Use self-tapping screws to fix the panel and the supporting structure, and make the spacing. Keep in mind that the integrity of the panel must be maintained. After installing several panels, be sure to check the geometric dimensions and verticality after the third panel (whether they are observed).
Installation of roofing sandwich panels
Roof panels are installed with a 5% slope.
First, a support platform must be created on the supporting roof structures.
Special attention should be paid to the slope between the panels. If the length of the slope exceeds 12 metres, the installation should start from the roof edge to the core.
First, the first panel is lifted (using a forklift) and placed on the supporting roof structure. The correct position and inclination of the panel is a prerequisite. The quality of further installation depends on them.
The panel is attached to the structure with self-tapping screws, after which it is unfastened. The integrity of the panel should be monitored.
The sealant is applied to the place where the first panel is tilted, and the next panel is cut at the ends. Then the panel is attached to the supporting roof structures and undone.
Next, you need to connect (in the transverse joint) the upper panel with the lower one. After completing the installation of panels in rows 1 and 2, you can start making longitudinal inter-panel connections. Each panel (during work breaks) should be fixed with screws to the supporting structures.
It is recommended to walk on the panels (after completion of installation work) only in special shoes. It is also necessary to use mats that have support on the supporting structures.
Do not install lifts or other technical devices on the panels. Fasten the equipment to the supporting roof structures.
Work after installation is complete
The final step is to first remove the protective film from the wall cladding and then from the roofing material, both from the outside and inside. In order to give the building an aesthetic appearance, it is important to get rid of possible dirt with a damp cloth soaked in water or solvent.
Operation of the panels
During the operation of structures consisting of sandwich panels, it is important to regularly inspect the condition of the panels, inter-panel joints, shaped elements and their fasteners at least once a year.
In the period between seasons, accumulated debris, pine needles and leaves should be removed from the structures. The rainwater and meltwater drainage system must be cleaned very carefully.
When removing snow from the roof, be careful not to damage the metal cladding of the sandwich panels and the fasteners of the fittings. Here are some tips for proper operation and maintenance of sandwich panels:
Soiled outer surfaces of the panels should be cleaned with a soft brush and rinsed with running water from top to bottom. Alternatively, a pressure washer can be used (max. 50 bar). It is not recommended to use solvents or other chemically active substances that may damage the paintwork.
Heavily soiled areas should be washed with a dilute soap solution and then rinsed off thoroughly. The roof paintwork should be washed from top to bottom to completely remove the detergents. The last step is to rinse the drainage system with water.
Any possible damage to the coating is repaired with special repair paints suitable for the specific type of paintwork, such as automotive paints.
Repair of the coating should be carried out as soon as possible after the damage to avoid further spread. If the scratch does not damage the metal cladding, a single coat of paint is sufficient, but if the scratch reaches the metal, the paint should be applied in two coats with a primer.
Before painting, remove any possible rust in the scratch, then clean the damaged area with a white spirit. Paint should be applied only to the damaged areas, taking care not to extend the repair area, as this may result in a noticeable colour difference between the painted and original surface.
When installing sandwich panels, silicone sealants or moulded joints are often used at the joints of inter-panel seams and moulded joints. Therefore, during the inspection, it should be checked whether all these joints are properly sealed.
The tightness can be compromised by mechanical stress or temperature differences. In this case, re-apply a suitable thermal insulation to the damaged area.
General recommendations for the installation of sandwich structures
Correct installation of sandwich panels determines the quality and service life of the building. Careful adherence to these guidelines will help to avoid problems and ensure the reliability of the building for a long time:
Conclusion
The specifics of installation and surface maintenance are determined by the type of sandwich panels. For proper installation, a fastening system has been developed that ensures simplicity, speed and reliability.
The main elements are bearing screws made of high quality steel. They ensure reliable connection of the panels to the structure. Installation work is carried out without drilling. This saves time.
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