How To Install Roofing Shingles Over Existing Roof

Start by laying asphalt felt or other underlayment over the roof.

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. So if there are already two layers the choice is made for you. Use a starter strip or cut pieces for a starter course. Remove the cover and then nail the old shingles back down again.

Step 3 cover the old shingles. You need to tear off the roof and install a new one. Install a layer of roofing felt over the roof before you begin installing the new shingles. The felt should be secured every six inches with nails or staples.

But if the current roof is curling this isn t possible. 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. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Damaged shingles should be removed to check the decking for problems.

Before you begin installing the new shingles be sure to inspect the roof for any damage. Attach with nails along the top edge of the strip. 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. Cut the existing shingles and pry up carefully.

If you nick or tear the old flashing piece then go buy a new one. Damaged decking will need to be repaired before you can install any new shingles. How to install a roof over an existing roof determine the feasibility. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

The roof should be in sound. Install new shingles to the lower edge of the opening. The condition of the existing roof is critical. Using your staple gun secure the felt to the roof.

Inspect the condition of your current roof.