Home Improvement Ideas Home Exteriors Roofs How to Install Roll Roofing For an affordable roof option, consider roll roofing. This material is very easy to install and only requires basic carpentry skills. By Caitlin Sole Caitlin Sole Instagram Caitlin Sole is the senior home editor at BHG. She is a writer and editor with nearly a decade of interior design expertise. She has vast experience with digital media, including SEO, photo shoot production, video production, eCommerce content, print collaboration, and custom sales content. Learn about BHG's Editorial Process Updated on January 3, 2023 Share Tweet Pin Email Photo: Richard Johnson Project Overview Total Time: 6 hours Skill Level: Intermediate For a utilitarian solution when appearance isn't as important, consider roll roofing, which is made of materials similar to composition shingles but generally not as durable. Be sure to check the warranty, which may be for only one year. If you install roll roofing using the double-coverage method, it will last longer. Roll roofing is often installed over bare wood sheathing or sheathing that has been painted with a primer. Applying roofing felt first will better protect the sheathing against condensation, as well as against leaking. If the roof is sloped, you can use the exposed-nail method. For a slightly sloped roof, use the concealed-nail method shown. For a flat or nearly flat roof, use double coverage, although a torch-down modified bitumen or EPDM roof is a better solution. Working with a helper, expect to spend half a day installing flashings and roll roofing for a 700-square-foot roof with modest complications. Prepare the roof by tearing off the old shingles, or by preparing for a reroof. Since this is the least difficult of roofing materials to install, only basic carpentry skills are needed. What You'll Need Equipment / Tools Hammer or power nailer Measuring tape Flat pry bar Carpenter's square Tin snips Utility knife Chalkline Broom Materials Flashing Nails for flashing Roofing felt or primer Roll roofing Nails long enough to poke through the sheathing Roofing cement Instructions Better Homes & Gardens Roll Out Materials Install drip-edge flashings, roofing felt, and WSU, if needed. You can install metal valley flashing, but it is common to simply apply an 18-inch-wide strip of roll roofing instead. Set it in a bed of roofing cement, smooth out any creases, and drive nails near the edges. The Average Cost of Roof Repair vs. Replacement: What to Consider Better Homes & Gardens Attach First Course Position the first course so it overhangs the drip edges by about ¼ inch and roll it out a distance of 8 feet or so. Drive nails every 3 inches along the rake at one end, pull it taut, and drive nails along the eave edge. The nails should be about 1 inch from the edges. For extra protection add a 3-foot-wide strip on top of the 18-incher. Better Homes & Gardens Attach Second Sheet The next sheet overlaps the first by 4 inches or with some types of roll roofing, enough to cover the area that is bare of mineral surfacing. Snap a chalkline indicating the top of the next sheet, roll it out along the line, and drive nails as for the first sheet. Expert Tips for Roofing Over Existing Shingles Better Homes & Gardens Spread Roofing Cement Plan so that no two butt joints are closer than 2 feet from each other. Spread a 6-inch-wide layer of roofing cement on the edge of the first sheet and embed the next sheet in the cement. Better Homes & Gardens Seal Vents 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. The piece should overlap the lower course by at least 4 inches. Cut a hole in the roll roofing and slip it over as well. Embed both roofing pieces in cement. For added protection add a boot flashing. Better Homes & Gardens Overlap the Valley Work from one side roof past the center of a valley by 2 feet. Then, working from the other side, overlap the valley, strike a chalkline, and trim the piece at the center of the valley. Keep nails at least 12 inches from the center of the valley; use a 4-inch-wide bed of roofing cement to attach everything that is closer than 12 inches. What Roof Jacks Are, and How to Use Them Better Homes & Gardens Attach Final Piece In most cases you can simply overlap the sheets at the ridge using roofing cement and nails for the final piece. However if the final piece does not come down at least 8 inches past the peak, cover the peak with a 16-inch-wide strip that is embedded in cement. Better Homes & Gardens Optional: Adjust for a Sloped Roof 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. Use a trowel to spread roofing cement over half or more of the strips.Then, set the first course in the cement so it overhangs by about ¼ inch. Position and roll out the roofing carefully because it is not easy to reposition, then press it into the cement. Nail only its top edge (the part that is bare of mineral coating). Coat the top edge with a 4- to 6-inch-wide layer of roofing cement and apply the next courses in the same way.