How To Install Roof Shingles Over Existing Shingles

Do both sides first and then install ridge cap shingles over the top.

How to install roof shingles over existing shingles.

Attach with nails along the top edge of the strip. Mark the location of the top of the uncut shingle on the felt. Installing new roof shingles over old effectively doubles the weight of the. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

Roofing second layer of shingles roofing. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. The first row of shingles should overhang the drip edge of the roof. Looks just as good and lasts as long.

The uncut shingle should hang a quarter of an inch over the roof edge. 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. To level out an existing asphalt shingle roof rip down reduce the height of two.

Manufacturers will still. Installing a new roof over shingles takes less time than tearing off the old roof. This provides added protection against ice dams. Continue marking lines every five inches up to the roof ridge.

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. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. 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.

Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed. Around an inch should do. Position one of the uncut shingles on top of a trimmed shingle. Cut the existing shingles and pry up carefully.

Remove the cover and then nail the old shingles back down again. Leave the old valley flashing in place and install new over it. Along the eaves install a new drip edge over the butt ends of existing shingles. Install new shingles to the lower edge of the opening.

Has the same manufacturer s warranty.