In construction, expansion joints are intentionally created gaps between two buildings or structural elements. Separated parts work more efficiently and are free to deform. However, expansion joints require filling. For this task (and not only for this) there is a special building material - expansion tape . Made of polyethylene foam, it is strong and resistant to chemicals used in construction, and at the same time flexible, soft, light and easy to use.
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How to choose the thickness of the expansion tape?
Depending on the requirements of the specific implementation and the type of heating in the room, the appropriate thickness of the expansion tape should be selected. For underfloor heating, the thickness is calculated according to a special formula: D = ΔT × α × L ÷ P, where D is the thickness of the expansion tape. However, regardless of the result obtained, the thickness of the tape should not be less than 8 mm. In interiors without underfloor heating, the optimal thickness is the standard 8 mm.
When is it best to use edge tape?
Expansion tape (also known as expansion foam) is widely used in construction and renovation and finishing works. It is used to fill expansion gaps when making screeds, floors, panels, walls, surfaces, etc. It is used not only in buildings, but also outside - in underground passages, tunnels, bridges or roads. It reduces stress, limits air permeability and prevents the development of microorganisms. It has a protective, cushioning and filling function. It works well as acoustic and thermal insulation under floor panels.
The product is also used to create edge expansion joints in floor screeds, hence the alternative name: " edge tape ". The screed naturally increases in volume as it dries, which could lead to cracking of the wall or damage to the screed itself. Edge expansion tape protects the perimeter of the floor surfaces. It prevents the consequences of thermal expansion and swelling of materials. It reduces the risk of cracking and heat loss. It is essential when preparing the underfloor heating. It allows you to delimit heating zones, prevents heat loss and insulates acoustically.
In addition to the popular foamed polyethylene (PE) product, there is also a polyvinyl chloride (PVC) edge tape, which is used to seal gaps in concrete and reinforced concrete structures. It also creates a water barrier. The edge tape is very simple and convenient to use, especially in the self-adhesive version. There are various widths, thicknesses (usually 8 or 10 mm) and lengths (e.g. 50 m) to choose from. When buying an edge tape, it is essential to check the thickness of the floor.
Advantages and applications of expansion joint profiles
Expansion profiles are used to separate heating zones for underfloor heating. They prevent cracking of the screed and the finishing layer. The expansion profile allows for free expansion of the flooring in the rooms and is an important decorative element of the interior. It effectively masks unsightly joints and possible unevenness. Equipped with adhesive tape, it facilitates installation to the substrate. Plastic expansion profiles are particularly popular.