How To Install Roofing Shingles Over Existing Roof

Before you begin installing the new shingles be sure to inspect the roof for any damage.

How to install roofing shingles over existing roof.

But if the current roof is curling this isn t possible. Inspect the condition of your current roof. The roof should be in sound. How to install a roof over an existing roof determine the feasibility.

Remove the cover and then nail the old shingles back down again. Cut the existing shingles and pry up carefully. Start by laying asphalt felt or other underlayment over the roof. Attach with nails along the top edge of the strip.

The felt should be secured every six inches with nails or staples. The condition of the existing roof is critical. 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. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

Install new shingles to the lower edge of the opening. Install a layer of roofing felt over the roof before you begin installing the new shingles. Overlap each row at least 3 to 4 inches. Using your staple gun secure the felt to the roof.

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. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

Damaged shingles should be removed to check the decking for problems. Damaged decking will need to be repaired before you can install any new shingles. Step 3 cover the old shingles. You need to tear off the roof and install a new one.

So if there are already two layers the choice is made for you.