How To Install Roofing Shingles Over Existing Roof

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.

How to install roofing shingles over existing roof.

The felt should be secured every six inches with nails or staples. So if there are already two layers the choice is made for you. 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. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

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. Install new shingles to the lower edge of the opening. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one.

If you nick or tear the old flashing piece then go buy a new one. The roof should be in sound. Damaged decking will need to be repaired before you can install any new shingles. You need to tear off the roof and install a new one.

This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof. 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. Cut the existing shingles and pry up carefully.

Attach with nails along the top edge of the strip. Inspect the condition of your current roof. The condition of the existing roof is critical. Use a starter strip or cut pieces for a starter course.

Before you begin installing the new shingles be sure to inspect the roof for any damage. But if the current roof is curling this isn t possible. How to install a roof over an existing roof determine the feasibility. Step 3 cover the old shingles.

Remove the cover and then nail the old shingles back down again.