How To Install Roof Shingles Over Existing Shingles

Use a starter strip or cut pieces for a starter course.

How to install roof shingles over existing shingles.

Use the chalk line to mark the line at that spot across the roof. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. Manufacturers will still. 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. 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. Install new shingles to the lower edge of the opening.

Leave the old valley flashing in place and install new over it. Position one of the uncut shingles on top of a trimmed shingle. Remove the cover and then nail the old shingles back down again. Roofing second layer of shingles roofing.

Has the same manufacturer s warranty. This provides added protection against ice dams. Installing new roof shingles over old effectively doubles the weight of the. Do both sides first and then install ridge cap shingles over the top.

Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. To level out an existing asphalt shingle roof rip down reduce the height of two. 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. Continue marking lines every five inches up to the roof ridge.

Around an inch should do. Looks just as good and lasts as long. Each shingle will require around 4 nails underneath the tar line and about half an inch under where the next shingle will overlap. Attach with nails along the top edge of the strip.

The uncut shingle should hang a quarter of an inch over the roof edge. The first row of shingles should overhang the drip edge of the roof. Cut the existing shingles and pry up carefully. Mark the location of the top of the uncut shingle on the felt.

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.