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.

home exterior
Photo:

Richard Johnson

Project Overview
  • Total Time: 6 hours
  • Skill Level: Intermediate

For a practical solution when appearance isn't as important, consider installing rolled roofing. This product is made of materials similar to composition shingles but generally isn't 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's been painted with a primer. Installing rolled roofing felt first will better protect the sheathing against condensation and leaking.

If the roof is sloped, you can use the exposed-nail method. For a slightly sloped roof, use the concealed-nail method shown. Use double coverage for a flat or nearly flat roof, 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 roofing material 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

How to Install Rolled Roofing

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    Better Homes & Gardens

    Roll Out Materials

    Install drip-edge flashings, roofing felt, and WSU, if needed. You can install metal valley flashing, but it's common to 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.

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    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.

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    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.

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    Spread Roofing Cement

    Plan so that no two butt joints are closer than 2 feet apart. Spread a 6-inch-wide layer of roofing cement on the edge of the first sheet and embed the next sheet in the cement.

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    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.

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    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 chalk line, 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.

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    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 last piece does not come down at least 8 inches past the peak, cover the peak with a 16-inch-wide strip embedded in cement.

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    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 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 repositioning it isn't easy, then press it into the cement. Nail only its top edge (the part bare of mineral coating). Coat the top edge with a 4- to 6-inch-wide layer of roofing cement and apply the following courses similarly.

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