Rolling Roof Overlap Inches

Selvage edge roofing is installed the same way as full width roll roofing except that each course overlaps the previous course 19 inches instead of 4.

Rolling roof overlap inches.

Once the first row is done add approximately two inches of cement to the top of the first row to secure the second row of roofing. In other words if the height of the roof drops by 2 inches for every 12 inches in length you will need to use sealant to strengthen the overlap barrier. Measure and mark 35 inches from the bottom. Use a trowel to spread roofing cement over half or more of the strips.

This technique will also work with full width rolls if you cannot find selvage edge roll roofing in your local store. If you have a sloped roof cut strips of roofing 9 inches wide position them flush with the drip edges along the eave and rake and attach them by driving two rows of nails that are about 3 inches apart. The additional overlap may only create problems when installing the shingles and felt over the roof structure. Position and roll out the roofing carefully because it is not easy to reposition then press it into the cement.

Apply about two inches worth of cement under either side to seal the roofing down and then nail it down making sure it still stays flat and even as you go. Nail only its top edge the. Although overlapping felt more than 2 inches may provide extra protection the 2 inch overlap is adequate for most applications and will provide an excellent roof. Nail it in place with roofing nails spaced 6 inches apart and placed 1 inch from the edge.

Therefore use a 2 inch overlap for roof felt. If lap sealant is used simply apply a bead of sealant on top of the underlap ridge going all the way down the length of the ridge before the overlap ridge of the next panel is placed on top. Roll out the first sheet and ensure that it lies flat and even.