Install New Roof Shingles Over Old

Does it make sense to install new shingles over old ones.

Install new roof shingles over old.

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. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Step 3 cover the old shingles. Damaged shingles should be removed to check the decking for problems.

Before you reshingle a roof read our step. 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. A reliable roofer will always do a roof inspection. 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.

Installing a new roof over shingles takes less time than tearing off the old roof. The felt should be secured every six inches with nails or staples. 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. Leave the old valley flashing in place and install new over it.

Although it is often necessary to remove old shingles it s great when you can avoid the added expense of a tear off. Install a layer of roofing felt over the roof before you begin installing the new shingles. Layering shingles on top of one another also means you re not getting a good idea of what s going on underneath the top layer of your roof. Four years after installing my new shingles they re still nice.

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. 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. Finally i had time to put the video clips together.

Please click show more below to know. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below. Has the same manufacturer s warranty. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.

Looks just as good and lasts as long. That s also why building codes commonly limit re roofing to no more than two layers. The roof also consists of decking and underlayment. If you install new roof shingles over old ones your roof might sag and lose integrity over time.