Seam Fastening Systems for Roofing Membranes

The mechanical fastening of waterproof sheets is conventionally done in the form of a linear fastening. 

How Seam Fastening Works in Flat Roof Construction

With this type of fastening, an individual fastener is installed, usually in the seam or the overlapping area of the roofing membrane. The fastening combination always consists of a stress plate and a fastener, which can differ depending on the substrate. The position of the stress plate is always at least one centimetre from the edge of the roofing membrane and is specified by the roof manufacturer. 

Roof Membrane Welding and Overlap Requirements

To seal the construction, the roofing membranes are welded together. The welded seam is four to five centimetres in size, meaning that the overlapping of the roofing membranes is due to the width of the sealing joint, the dimensions of the stress plate and the distance from the edge of the stress plates to the roofing membrane.