Lay corrugated sheets correctly - tips on substructure, tools & structure

Corrugated sheets are often used as cheap roofing in the garden. They are easy to maintain, shatterproof, UV-resistant and can also be easily installed by yourself.

Corrugated sheets - Inexpensive and long-lasting roof coverings Carports, garden houses, greenhouses or wooden shelters - corrugated sheets are often used here as roof coverings. The plates have several advantages.

They are very durable, can be cleaned quickly and can be installed by the hobby gardener with a little manual skill. So they are the optimal and cheaper alternative to roof tiles & Co ...

Different materials

Before you start laying, you should familiarize yourself with the different materials. There are serious differences here. In a brief overview of the materials, the experts at W&S Kunststoffe point out that some materials are very similar in appearance, but there are significant differences in the material. Must see, see link above. It is important here that you find the right panels for you that also meet your requirements.

You can find corrugated sheets made of the following materials, for example:

  • PVC
  • GRP (glass fiber plastic)
  • polycarbonate
  • acrylic

Corrugated sheets made of polycarbonate or acrylic glass (plexiglass) are used most frequently these days. Acrylic glass has a similar look to glass, but acrylic glass is significantly more robust. Polycarbonate is more like plastic, but is lighter and thinner than acrylic and also offers constant impact resistance. What you ultimately decide on is a matter of taste.

Lay corrugated sheets - how it works

If you have decided on a certain material, you can start right away. The structure is the same for all corrugated sheets.

Build substructure

The most important thing with corrugated sheets is a proper substructure. It looks like this:

With corrugated sheets you need a substructure with cross battens, on which you screw the sheets. This substructure can be made of metal or wood. With wood, however, you should make sure that it is free of distortion. Glue binders that do not warp under the various weather conditions are best suited here. In contrast to normal timber - in the worst case it can happen that the panels are damaged (cracks or cracks). You should be particularly careful with acrylic sheets, because like glass they are very sensitive.

The battens are fastened across the slope. The support distances vary depending on the material.

Source: W&S Kunststoffe

PVC and polyester
For PVC and polyester use a support distance of 50 cm.

Polycarbonate and acrylic
A distance of approx. 80 cm is sufficient for polycarbonate and acrylic.

These values ​​apply to average snow and wind loads. If you are expecting greater loads, you should reduce the distance accordingly.

The last point that should be considered in the substructure is the top. You should paint these brightly to avoid burns on the corrugated sheet. In summer, there are high temperatures between the construction and the panel, which can particularly clog PVC and GRP panels. The plates not only change their color here, they also deform.

You need the following material:

➜ screws
You need screws to fix the corrugated sheets to the substructure. The experts from Primo fastening technology recommend so-called plumber screws for this application (available here). These are particularly watertight due to the included sealing washer. They are also weather and corrosion resistant. Optimal conditions for the use to connect plastic and wood.

➜ saw
To be able to cut the corrugated sheets to your size, you also need a high-speed hand or table circular saw. Preferably with a fine-toothed saw blade that is equipped with hard metal blades.

➜ drill
You should also have a tapered drill (such as this one here) to pre-drill holes in the corrugated sheets. Incidentally, these should be 3-4 mm larger than the diameter of the plumbing screws. This means that the plates can expand or shrink sufficiently in the event of temperature differences.

Important information on laying:

After you have made all the preparations and the tool is ready, you can now start laying. Proceed as follows:

✜ Step 1:
Start with the first corrugated sheet. Place this on the substructure and align it. Now the second record follows. It is important that you work exactly with these two plates, then not much can go wrong with the following ones.

»By the way: Always work against the wind. This means that no water can press under the overlap in heavy rain.

2 Step 2:
Secure the first two corrugated sheets with a few screws so that they can no longer move.

»Caution: If you move back and forth on the corrugated sheets, you should definitely lay a screed underneath to distribute the weight.

3 Step 3:
Now that the first panels have been attached, you can continue with the other panels. Fix these with a few screws as well. At the end of the roof, you should make sure that the ends close flush. Cut the panels accordingly beforehand.

»Note: Only drill the holes on the wave crest.

4 Step 4:
After all panels have been laid and fixed, you can carry out the remaining screwing. Experts recommend about 6 to 8 screws per square meter.

That's it. And wasn't difficult at all, was it?