How To Install Roofing Shingles Over Existing Roof

You need to tear off the roof and install a new one.

How to install roofing shingles over existing roof.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Step 3 cover the old shingles. But if the current roof is curling this isn t possible.

Install new shingles to the lower edge of the opening. The roof should be in sound. 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.

Attach with nails along the top edge of the strip. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out.

The felt should be secured every six inches with nails or staples. Using your staple gun secure the felt to the roof. 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. Start by laying asphalt felt or other underlayment over the roof.

Damaged decking will need to be repaired before you can install any new shingles. Inspect the condition of your current roof. Install a layer of roofing felt over the roof before you begin installing the new shingles. Damaged shingles should be removed to check the decking for problems.

Cut the existing shingles and pry up carefully. 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. So if there are already two layers the choice is made for you. Before you begin installing the new shingles be sure to inspect the roof for any damage.

How to install a roof over an existing roof determine the feasibility.