Re Roofing Over Architectural Shingles

Re roofing with 3 tab shingles are pretty straight forward.

Re roofing over architectural shingles.

The standard practice is to limit to a total of two layers of shingles. Local codes might not allow re roofing. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Asphalt roof shingle re roofing advice.

Re roofing may affect the warranty on the new shingles. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. We also discuss proper asphalt shingle roof preparation for a roofover job. If the job is done correctly with the new layer of shingles laid flat over the existing shingles the old roof cushions the new one and serves as a secondary barrier should wind or water ever break through the new shingles.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. If you look at the picture above you can see the difference. Three tab shingles are a constant thickness while architectural shingles have multiple layers that create an uneven surface. However we wouldn t recommend this practice.

If you re going strictly via code you can install a layer over a layer. Two layers is the maximum in most areas but some building codes allow only one. 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. Statistics by the national roof contractors association show that nine out of ten roofs in the us fail due to a ventilation issue.

While both types are made up of the same essential components re roofing over architectural shingle is a different case altogether. Roofing second layer of shingles roofing. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. This article discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles.

After that you should tear off old shingles before installing a new layer.