The installation is carried out with the ribs (or corrugations) running down the slope of the roof (longitudinal and transversal overlaps).
Horizontal laying direction: Opposite direction of the prevailing wind. The sheet to be installed covers, along with the adjacent longitudinal edge, the sheet installed previously.
Vertical laying direction: From the bottom up. The downslope lap (cut back) of the top sheet covers the lower sheet already installed.
The fixings must include the following accessories (waterproofing and loads distribution):
- Sealing washers
- Saddle supports or curved washers adapted to the profile and to the site corrosivity
- Profile supports.
Because of the coefficient of expansion of the material, drill the fastener holes to a diameter 4 mm larger than the fastener diameter.
PVC washers are prohibited.