Clear the valley area and dispose of any debris that can cause water to back up and pool.
Inspect the shingles and underlayment in the valley of the roof. Ensure they are cut in a straight line and do not stick out into the valley area in order to prevent water from being diverted under the shingles. If the shingles extend into the valley, trim them accordingly with a utility knife.
Inspect the shingles in the areas around the valley and replace any that are damaged. Raise the edge of the shingle located above the damaged one. Pry out the nails of the damaged shingle. Remove the shingle and nail a new one into place.
Coat the area where the shingles meet the valley flashing with roofing cement. Raise the shingles and apply the cement underneath with a flat trowel.
Apply a bead of roofing caulk down the flashing area in the valley, right next to the shingles, to provide a final layer of waterproofing in vulnerable areas.
Things You Will Need
- Utility knife
- Pry bar
- Replacement shingles
- Roofing nails
- Flat trowel
- Roofing cement
- Roofing caulk
- Regularly inspect your roof to catch potential problems before a leak can cause extensive damage to your home.