Rolled Roofing Concealed Nail Method

The nails should start 3 4 inch from the edges of the roofing and be 6 inches apart throughout the roofing s surface.

Rolled roofing concealed nail method.

Roll roofing is often installed over bare wood sheathing or sheathing that has been painted with a primer. Rolled roofing material is often used on roofs that are low sloped. Nail down the 18 inch roll roofing sheet that it is covering the valley. Depending on roof slope you can apply rolled roofing using either an exposed or concealed nail method says u s.

The exposed nail applica tion pages 87 to 88 is the fastest installation method and can be used on sloped roofs. If your roof pitch declines up to 1 inch vertically for every 12 inches horizontally 1 12 pitch it is a good candidate for rolled roofing as long as you use the concealed nail method of fastening. That portion of the flashing attached to a vertical surface above the plane of the roof to prevent water from migrating behind the base flashing. Preparing to install rolled roofing prepare the roofing.

Applying roofing felt first will better protect the sheathing against condensation as well as against leaking. Step 4 trim any roofing that extends beyond the edge of the roof. Roofing nails with 3 8 or larger head. Concealed nail method a method of installing asphalt roll roofing material in which all nails or fasteners are driven into the underlying roofing and covered by an overlapping course.

Application of roll roofing in which all nails are covered by a cemented overlapping course. It can be used for roof slopes down to 2 in 12 with the exposed nail method or down to 1 in 12 with the concealed nail method. If the roof is sloped you can use the exposed nail method. For a slightly sloped roof use the concealed nail method shown.

The concealed nail application page 89 is best for roofs with a slighter pitch all the way down to a 1 in 12 slope because it prevents water from penetrating under the nail heads. Cut the roll roofing into lengths long enough to cover one run across the shed roof or of 18 whichever fits your shed better and lay them out on a flat surface to smooth them out. This leaves nails unexposed to the weather. Double coverage roofs last much longer up to fifteen years or more.