The roofing company I hired finished applying Polyfresko bitumen on my garage, and instead of welding the beginning and end of new layers at the edges, they overlapped one layer over another by about 6 inches, resulting in a “hump” of overlapping layers.
Is this normal? I thought the membrane would be completely flat. First example:
The overlap can be seen from the driveway:
Where one sheet ends, they overlapped the new sheet by about 6 inches instead of welding at the edge of the sheet:
Best Answer
No, it’s not normal for the edges to be loose.
Poly glass is a self sealing modified bitumen roofing product. See here:
http://www.polyglass.com/public/COM/products/POLYFRESKO_G_SA.pdf
As you can see in Item #6 of the installation instructions, the seams are to be lapped 6” and side lapped 4”.
I think it’s installed correctly.
If there are loose edges you could have leaks, blow-off, etc. AND your warranty is void.