Double-wall sheets and associated profiles

Double-skin sheets are probably among the most popular building materials for roofing. Due to the enormous progress in assembly technology for all types of multi-wall sheets, profile frames have come to the fore. Previously, when web plates had to be glued or screwed on, thanks to modern profiles, it opens up completely new possibilities in the application of double-wall sheets and the associated profiles.

Numerous applications for multiwall sheets

Plastic is also an important building material in the construction industry and thus for home improvement. In particular, polycarbonate and polymethylmethacrylate belong here to the important plastics. This also makes plastic plates for a wide variety of applications. Be it plastic panels for the façade, double-skin sheets for the greenhouse or the installation of double-skin sheets on a substructure as a roofing.

Attach the double-skin plates

Depending on the application and requirement then plates made of polycarbonate or PMMA are used. The latter are more commonly known as "acrylic plates" or "acrylic glass". A special form of these plastic plates are so-called double-skin sheets. They are also available as triple and quadruple-wall sheets, which refers to the design of the webs. Absolutely static fastenings, ie screwing or gluing, are often rather unsuitable.

In particular, double-skin sheets heat up strongly. The heating inevitably leads to an expansion of the material. Incidentally, this makes so much that with a one-meter-long double-skin plate from this 1 m in winter at minus 25 degrees Celsius only 99.5 cm. The double-skin sheets must therefore be moved almost elastically or dynamically so that they can move. At the same time, however, they must also be watertight against entry of water or meet heat-insulating requirements.

Lay double-skin sheets using profiles

This is best achieved through profiles. These profiles usually consist of the following materials:

  • Metal (aluminum)
  • plastic
  • a coextruded rubber sealing strip

In addition, the profiles are distinguished according to the bottom and the top of the profiles. Each manufacturer names these individual components differently. This makes the laying of double-ridge strips initially complicated, but it is on closer inspection not at all. In addition, there are profiles between two double-skin sheets and naturally final profiles.

Structure of the web plate profiles

In cross-section with these profiles as a lying "U" imagine. A center rung would then be in a double, lying "U" shape with the openings facing outwards. Then you have to imagine this cross-section in the middle from top to bottom in two parts, so to speak, two L-profiles, which later become a three-sided profile.

Laying the web plates in the profile rungs

Now the lower profile can be attached to the substructure. Then the coextruded rubber strip is pulled in. Now the double-wall sheets can simply be inserted into the profiles forming a lateral closure. If two panels are already laid next to each other, the top of the profile is simply slipped onto the fixed profile.

Double-skin plate profiles for different applications

On the inside up there is also a rubber strip, which seals the connection between the double-web plate and the profile. But not only in the material can these profiles be differentiated. Another distinction is made according to the use claims:

  • Profiles exclusively for metal substructures
  • Profiles exclusively for wooden substructures
  • Profiles that can be used equally for wood and metal
  • Laying profiles for thermal separation or decoupling of Isolierdoppelstegplatten
  • Connection profiles made of polycarbonate, for example, do not force waterproof and non-wearing

Further accessories to the profiles

In addition to these actual mounting profiles, numerous other products are also offered that round off a double-skin plate construction and also seal it further. These include wall connection profiles, end caps, brake angle, ridge angle and ridge profiles.

Tips & Tricks

"Coextruded" means that the inherently black gum is coated brightly or whitish on the surface facing upward. As a result, heat generated by solar radiation is not stored and the profiles can not heat up here. Otherwise, the double-skin sheets in these areas around the rubber strips could permanently suffer thermal damage. This construction technique using the profiles largely avoids the otherwise typical crackling and creaking noises that a double skin roof can cause. If you have to cut multi-wall sheets, always consider the temperature-related stretching (summer) and contraction (winter) of the sheets.

Video Board: PP hollow profile sheet extrusion line/PP double wall sheet extrusion line