How To Install Roofing Shingles Over Existing Roof

The felt should be secured every six inches with nails or staples.

How to install roofing shingles over existing roof.

Start by laying asphalt felt or other underlayment over the roof. Step 3 cover the old shingles. Remove the cover and then nail the old shingles back down again. Cut the existing shingles and pry up carefully.

Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Damaged shingles should be removed to check the decking for problems. These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out. If you nick or tear the old flashing piece then go buy a new one.

Use a starter strip or cut pieces for a starter course. Damaged decking will need to be repaired before you can install any new shingles. 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.

So if there are already two layers the choice is made for you. Install new shingles to the lower edge of the opening. But if the current roof is curling this isn t possible. You need to tear off the roof and install a new one.

Before you begin installing the new shingles be sure to inspect the roof for any damage. Overlap each row at least 3 to 4 inches. How to install a roof over an existing roof determine the feasibility. 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.

Using your staple gun secure the felt to the roof. The condition of the existing roof is critical. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Attach with nails along the top edge of the strip.

The roof should be in sound.