Roof unevenness in the GRP is the result of quite natural tensions that arise in the course of sandwich production. During the production of our roofs, we press
- the outer skin made of GRP,
- with the EPS underneath
- with the intermediate lath framework and frame around the roof cut-outs
- and the expanded metal inserts
- with the roof décor located in the interior
into a sandwich under pressure and heat.
This sandwich element is a strong, stable composite. However, in the case of temperature fluctuations, the surface cannot be completely flat. The above-mentioned materials expand to different degrees and at different speeds, which leads to surface irregularities.
This does not represent a defect and corresponds to the current state of the art in sandwich construction. Of course, this irregularities are exacerbated when accessories are subsequently installed on the roof and the roof is knelt on to do so.