Re Roofing Over Architectural Shingles

Re roofing may affect the warranty on the new shingles.

Re roofing over architectural shingles.

Asphalt roof shingle re roofing advice. However we wouldn t recommend this practice. Three tab shingles are a constant thickness while architectural shingles have multiple layers that create an uneven surface. Local codes might not allow re roofing.

Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. The standard practice is to limit to a total of two layers of shingles. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Statistics by the national roof contractors association show that nine out of ten roofs in the us fail due to a ventilation issue.

This article series discusses best practices in the selection and installation of residential roofing. Re roofing with 3 tab shingles are pretty straight forward. While both types are made up of the same essential components re roofing over architectural shingle is a different case altogether. 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.

How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. Be sure to check with the shingle manufacturer regarding all warranty issues and installation requirements before re roofing. If you look at the picture above you can see the difference. 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.

Two layers is the maximum in most areas but some building codes allow only one. This article discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. If you re going strictly via code you can install a layer over a layer.

Roofing second layer of shingles roofing.