Install New Roof Shingles Over Old

If you install new roof shingles over old ones your roof might sag and lose integrity over time.

Install new roof shingles over old.

Step 3 cover the old shingles. Along the rakes install a new j channel drip edge which wraps around the old rake flashing and starter courses. This provides added protection against ice dams. 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.

A reliable roofer will always do a roof inspection. The felt should be secured every six inches with nails or staples. 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. Finally i had time to put the video clips together.

That s also why building codes commonly limit re roofing to no more than two layers. Leave the old valley flashing in place and install new over it. Installing a new roof over shingles takes less time than tearing off the old roof. To level out an existing asphalt shingle roof rip down reduce the height of two courses of shingles as shown in the drawing below.

The roof also consists of decking and underlayment. In the right situation putting new shingles over old ones saves money and helps the environment. 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. Damaged decking will need to be repaired before you can install any new shingles.

Please click show more below to know. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. Before you reshingle a roof read our step. Although it is often necessary to remove old shingles it s great when you can avoid the added expense of a tear off.

Has the same manufacturer s warranty. 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. Does it make sense to install new shingles over old ones. Can you put new asphalt roof shingles right over old ones.

Install a layer of roofing felt over the roof before you begin installing the new shingles. 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. Damaged shingles should be removed to check the decking for problems. 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.