How To Install Roof Shingles Over Existing Shingles

Manufacturers will still.

How to install roof shingles over existing shingles.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Roofing second layer of shingles roofing. Continue marking lines every five inches up to the roof ridge. 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.

Install new shingles to the lower edge of the opening. As long as it s done right and under the right conditions installing new shingles over old ones can last as long and look just as good as a complete re roof. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

Along the eaves install a new drip edge over the butt ends of existing shingles. Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed. The first row of shingles should overhang the drip edge of the roof. Looks just as good and lasts as long.

Has the same manufacturer s warranty. Installing new roof shingles over old effectively doubles the weight of the. Use a starter strip or cut pieces for a starter course. Position one of the uncut shingles on top of a trimmed shingle.

Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. This provides added protection against ice dams. If you nick or tear the old flashing piece then go buy a new one. Cut the existing shingles and pry up carefully.

The uncut shingle should hang a quarter of an inch over the roof edge. Installing a new roof over shingles takes less time than tearing off the old roof. Leave the old valley flashing in place and install new over it. Attach with nails along the top edge of the strip.

Mark the location of the top of the uncut shingle on the felt. Do both sides first and then install ridge cap shingles over the top. To level out an existing asphalt shingle roof rip down reduce the height of two. Use the chalk line to mark the line at that spot across the roof.

Around an inch should do.