How To Install Roofing Shingles Over Existing Roof

Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one.

How to install roofing shingles over existing roof.

Using your staple gun secure the felt to the roof. There are already two layers of shingles on your roof most building codes only allow two layers of any type of roofing on your home. Before you begin installing the new shingles be sure to inspect the roof for any damage. Use a starter strip or cut pieces for a starter course.

The condition of the existing roof is critical. The roof should be in sound. How to install a roof over an existing roof determine the feasibility. These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out.

Step 3 cover the old shingles. Start by laying asphalt felt or other underlayment over the roof. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

Cut the existing shingles and pry up carefully. Inspect the condition of your current roof. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. But if the current roof is curling this isn t possible.

Overlap each row at least 3 to 4 inches. Damaged decking will need to be repaired before you can install any new shingles. Rip cut the starter strip or starter pieces so that they butt up against the second course of existing shingles and are even with the front edge of the existing roofing. If you nick or tear the old flashing piece then go buy a new one.

Install a layer of roofing felt over the roof before you begin installing the new shingles. Install new shingles to the lower edge of the opening. The felt should be secured every six inches with nails or staples. Remove the cover and then nail the old shingles back down again.

Damaged shingles should be removed to check the decking for problems.