Hi all. We are taking bids to reroof a low-slope (flat roof) and are looking at the new modified bitumens( 2 or 2 ply sys). There are lots of types, but all seem to mention that the base sheet be applied to clean dry wood decking.I defy anyone to get hot mopped tar off of our decking. You could likely get the old roll roofing off but the tar it was set in??! We are getting many varied ideas as to how to best re-roof it and wondered what was the norm?
So far we have,
- Remove it as best as possible and screw down the base sheet, then the self adhesive 2nd sheet then Cap
- Leave the roof as is and screw down the base sheet to it. then the
- Hot mop OVER the old roof and apply base sheet. then the 2nd self adhesive sheet then Cap
- screw down 1" rigid insulation, then use self ashesive base coat, then the 2nd self adhesive sheet then Cap
Any thoughts and ideas Every roofer to come out has a different idea!
G--