Roof Shingles Over Roof Shingles

Should old shingles be removed before new installation.

Roof shingles over roof shingles.

Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin. In fact the only pro to a shingle over is it s cheaper and cleaner. March 11 2020 by safe harbor roofing reroofing is the practice that involves installing a new roof over an existing one. If you look at the picture above you can see the difference.

Good quality composite shingles can weigh 350 to 450 pounds per square 100 square feet of roofing installed. Looks just as good and lasts as long. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Three tab shingles are a constant thickness while architectural shingles have multiple layers that create an uneven surface.

We discuss the nesting method which helps minimize an uneven appear. Installing a new roof over shingles takes less time than tearing off the old roof. Choose a shingle style with the same dimensions as those on your. Although many metal roof systems can be applied over an existing roof layovers are more commonly done with asphalt shingles.

Yes you can install a metal roof over shingles. The quick answer is yes you can re roof architectural shingles over existing architectural shingles however you must check with the shingle manufacturer as well. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Building officials in some areas will only allow a re roof over one layer of shingles while officials in other places may allow you to place the roof over two layers of shingles.

When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch. 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. However you ll want to check with your local building department before you make any decisions. Has the same manufacturer s warranty.

Manufacturers will still. Installing new roof shingles over old effectively doubles the weight of the.