A properly flashed roof valley should have an ice and water shield installe with roofing felt being properly secured over the ice and water. If the ice and water shield is missing, then you will have to remove the shingles on both sides along the valley , put ice and water shield in place and re-shingle the roof. Cut each side of the flashing at the lower end to conform with the corresponding edges of the roof , using sheet metal cutters.
Cut each side at the upper end of the valley to conform with the corresponding slopes of the roof. I have a roof valley that looks like it needs replacing , how would I get it replaced without reshingling t he complete roof as the roof is still good. If you find that this is a problem, then you will need to repair your roof valley before anything serious happens, such as plaster loss, or even major water damage.
These instructions should now allow you to repair a leaking roof valley on a roof with woven shingles. This repair process is also the same for composition and . To repair an open valley : Step 1: Inspect valley for holes all along joint. Step 2: Clean surface of valley with wire brush. Step 3: Cut sheet metal patch about inches bigger all around than hole.