Flat Roof Rolled Roofing Overlap

Sbs roll roofing overlap width is commonly 3 4 or 3 6 varying by product and also referred to as the selvage edge width.

Flat roof rolled roofing overlap.

Ft sbs self adhering cap sheet roll for low slope roofing in black. 2 or 3 varies by manufacturer or 16 12 or 9 exposure for 2 3 or 4 ply roofs respectively. Roll out and cut another full length piece of rolled roofing. Overlap one of the long edges onto the edge of the first and.

Roll roofing overlap horizontal choose the overlap width according to the number of plies of roof to be installed. The piece should overlap the lower course by at least 4 inches. Add a second piece of full width roll roofing over the first. Nail the roofing in place with short roofing nails spaced 6 inches apart and 1 inch in from the outer edges of the roll roofing.

Align the length of roll roofing with the lowest edge of the flat roof and flush to the side edge of the roof. To seal a plumbing vent spread roofing cement around the pipe. Cut a hole in a piece of roofing about 2 feet wide and slip it over the pipe. Apply lap cement along the inner long edge of the first piece of roofing.

For added protection add a boot flashing. Smooth down the sheet with your hand to adhere the roll roofing to the roof deck. Embed both roofing pieces in cement.