Assembly of double web plates


Double-wall sheets are preferably used as roofing, where high light transmission is desired. This results in some peculiarities in the installation of double-wall sheets. Following you will find detailed instructions for the installation of double-wall sheets.

Basic properties of double-skin sheets

Double-wall sheets made of polycarbonate or polymethyl methacrylate are produced. The latter plastic is also known as PMMA or acrylic or acrylic glass. Double-wall sheets are double sheets made of polycarbonate or PMMA, which are connected to one another via webs. About the height of the webs defines the total thickness of the plates, which is usually between 4 and 16 mm. Under "Dimensions of double-wall sheets" you will learn everything to all other dimensions.

Double-wall sheets can be mounted in different ways:

  • sticky
  • bolted
  • loosely laid (in profiles)

Disadvantages of gluing and screwing

In particular, the gluing and screwing has the disadvantage that the plates expand when exposed to sunlight. This can cause violent crackling and creaking noises. In addition, the fixed connections can be solved. Therefore, most of the loose laying is used today.

Special features of loose laying

This requires profiles that are tailored to the dimensions of the double-skin sheets. Profiles, plates and everything else on mounting accessories should therefore come from the same manufacturer. In addition, you must also consider the requirements for the substructure for laying the double-skin sheets.

Profiles for the substructure

The profiles can in turn be selected according to existing substructure or according to requirements:

  • for mounting on a wooden substructure
  • for mounting on a metal substructure
  • Profiles that are suitable for both materials
  • Profiles for thermal decoupling or separation of the panels in thermal insulation applications

Requirements for the top of the substructure

The surface of the substructure must be bright. Finally, the plastic plates laid thereon are translucent. A dark substructure could heat up to such an extent that the double-skin sheets could be damaged. Alternatively, you can also cover the substructure with heat-reflecting aluminum (foil).

Step-by-step instructions for mounting double-skin sheets

  • Double-wall sheets
  • profiles
  • Flashings
  • Mounting accessories such as angle, ridge angle, brake and end angle and caps
  • Cordless Screwdriver
  • drilling machine
  • circular saw
  • clamps
  • Maurer pencil
  • foremen
  • small tools

1. Preparatory work

First, the substructure must be built. Then the connection profiles are mounted.
Now you can sort the profiles according to bottom and top as well as the middle (between two plates) and side use. If you need to cut double-skin sheets, we strongly recommend the link to the corresponding guide.

2. Assembly of the plate profiles

Now the dimensions for the fastenings of the profiles are transferred to the purlins of the substructure. Fix the profiles with screw clamps and screw them tight.

3. Laying the double-skin sheets

Now you can lay the double-skin sheets in the resulting frames. Once the panels have been laid, the top profiles of the rung profiles are still unplugged onto the already bolted profiles. You may need a small rubber mallet with which you beat very sensitively.

4. Theses

Now you can still mount end caps and other end profiles.

Tips & Tricks

If you want to clean the double-skin sheets, do not use a sponge. This could scratch the surface. When cutting double-skin sheets, remember that they only reach a height of 995 mm over a length of one meter at plus 25 degrees Celsius in winter, as they contract sharply or heat up accordingly in summer.

If you need to store the multi-wall sheets before installation, protect them from direct sunlight, as deep heat can be generated in the lower layers of the sheets, which can damage the sheets.


Video Board: Installing the Double-Stud Anchor Plate - Mac's Tie Downs