How To Install Roofing Shingles Over Existing Roof

Step 3 cover the old shingles.

How to install roofing shingles over existing roof.

Using your staple gun secure the felt to the roof. Install a layer of roofing felt over the roof before you begin installing the new shingles. Start by laying asphalt felt or other underlayment over the roof. Inspect the condition of your current roof.

Multiple layers of shingles can make it difficult or impossible for the nails to penetrate. Current shingles are curling or in bad shape the new shingle roof should lay flat on your old one. Use a starter strip or cut pieces for a starter course. If you nick or tear the old flashing piece then go buy a new one.

Install new shingles to the lower edge of the opening. 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. But if the current roof is curling this isn t possible.

These pieces act as a weather proofing and protective barrier between your house and the elements helping keep water and cold temperatures out. 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. Overlap each row at least 3 to 4 inches. 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.

So if there are already two layers the choice is made for you. Before you begin installing the new shingles be sure to inspect the roof for any damage. How to install a roof over an existing roof determine the feasibility. This is what it looks like when you install a steel shingle roof system over an existing asphalt shingle roof.

Cut the existing shingles and pry up carefully. The roof should be in sound. The condition of the existing roof is critical. Attach with nails along the top edge of the strip.

You need to tear off the roof and install a new one.