How To Install Roofing Shingles Over Existing Roof

To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

How to install roofing shingles over existing roof.

Install new shingles to the lower edge of the opening. 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. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. Start by laying asphalt felt or other underlayment over the roof.

The felt should be secured every six inches with nails or staples. Inspect the condition of your current roof. Damaged decking will need to be repaired before you can install any new shingles. Install a layer of roofing felt over the roof before you begin installing the new shingles.

How to install a roof over an existing roof determine the feasibility. Attach with nails along the top edge of the strip. Overlap each row at least 3 to 4 inches. You need to tear off the roof and install a new one.

Using your staple gun secure the felt to the roof. Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Before you begin installing the new shingles be sure to inspect the roof for any damage. 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. But if the current roof is curling this isn t possible. Step 3 cover the old shingles. The roof should be in sound.

If you nick or tear the old flashing piece then go buy a new one. So if there are already two layers the choice is made for you. The condition of the existing roof is critical. Cut the existing shingles and pry up carefully.

Use a starter strip or cut pieces for a starter course.