This project with show you how to handle a short-term roofing need using rool roofing.
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 in the box, below right. 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, half a day to install flashings and roll roofing for a 700-square-foot roof with modest complications
Hammer or power nailer, tape measure, flat pry bar, carpenter's square, tin snips, utility knife, chalkline, broom
This is the least difficult of roofing materials to install: Only basic carpentry skills are needed.
Prepare the roof by tearing off the old shingles, or by preparing for a reroof.
Flashing, nails for flashing, roofing felt or primer, perhaps WSU for the eaves, roll roofing, nails long enough to poke through the sheathing, roofing cement
Position the first course so it overhangs the drip edges by about 1/4 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.
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.
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.