How To Install Roofing Shingles Over Existing Roof

Install new shingles to the lower edge of the opening.

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

Damaged decking will need to be repaired before you can install any new shingles. 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. So if there are already two layers the choice is made for you. If you nick or tear the old flashing piece then go buy a new one.

But if the current roof is curling this isn t possible. The condition of the existing roof is critical. Overlap each row at least 3 to 4 inches. Install a layer of roofing felt over the roof before you begin installing the new shingles.

Attach with nails along the top edge of the strip. Step 3 cover the old shingles. Inspect the condition of your current roof. To vent the roof holes are cut in the old roof above the soffit which pulls air through the soffit vents underneath.

You need to tear off the roof and install a new one. The felt should be secured every six inches with nails or staples. 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.

How to install a roof over an existing roof determine the feasibility. Before you begin installing the new shingles be sure to inspect the roof for any damage. Damaged shingles should be removed to check the decking for problems. Start by laying asphalt felt or other underlayment over the roof.

The roof should be in sound.