How To Install Roof Shingles Over Existing Shingles

Continue marking lines every five inches up to the roof ridge.

How to install roof shingles over existing shingles.

To level out an existing asphalt shingle roof rip down reduce the height of two. Position one of the uncut shingles on top of a trimmed shingle. If you nick or tear the old flashing piece then go buy a new one. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses.

Use a starter strip or cut pieces for a starter course. Do both sides first and then install ridge cap shingles over the top. The uncut shingle should hang a quarter of an inch over the roof edge. Around an inch should do.

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. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. Remove the cover and then nail the old shingles back down again. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Has the same manufacturer s warranty. Cut the existing shingles and pry up carefully. Attach with nails along the top edge of the strip.

Mark the location of the top of the uncut shingle on the felt. Installing a new roof over shingles takes less time than tearing off the old roof. The first row of shingles should overhang the drip edge of the roof. Along the eaves install a new drip edge over the butt ends of existing shingles.

Installing new roof shingles over old effectively doubles the weight of the. Looks just as good and lasts as long. Manufacturers will still. Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. 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. Install new shingles to the lower edge of the opening. Roofing second layer of shingles roofing.

Use the chalk line to mark the line at that spot across the roof.