Install New Roof Shingles Over Old

That s also why building codes commonly limit re roofing to no more than two layers.

Install new roof shingles over old.

Leave the old valley flashing in place and install new over it. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Installing a new roof over shingles takes less time than tearing off the old roof.

Before you reshingle a roof read our step. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. Can you put new asphalt roof shingles right over old ones. Damaged shingles should be removed to check the decking for problems.

Looks just as good and lasts as long. The roof also consists of decking and underlayment. Does it make sense to install new shingles over old ones. Damaged decking will need to be repaired before you can install any new shingles.

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. Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. Has the same manufacturer s warranty. If the old ones are flat and you fill in any missing tabs and you do no more that a total of two layers of shingles yes you can reshingle over old shingles.

This provides added protection against ice dams. Although it is often necessary to remove old shingles it s great when you can avoid the added expense of a tear off. A reliable roofer will always do a roof inspection. Install a layer of roofing felt over the roof before you begin installing the new shingles.

In the right situation putting new shingles over old ones saves money and helps the environment. Four years after installing my new shingles they re still nice. If you install new roof shingles over old ones your roof might sag and lose integrity over time. The felt should be secured every six inches with nails or staples.

Manufacturers will still warranty the roof for the same amount of time as a re roof as long as it s done by a qualified installer. Step 3 cover the old shingles. 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. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.