Re Roofing Over Architectural Shingles

Asphalt roof shingle re roofing advice.

Re roofing over architectural 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. Re roofing may affect the warranty on the new shingles. Two layers is the maximum in most areas but some building codes allow only one. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

Local codes might not allow re roofing. Roofing second layer of shingles roofing. Three tab shingles are a constant thickness while architectural shingles have multiple layers that create an uneven surface. While both types are made up of the same essential components re roofing over architectural shingle is a different case altogether.

If you re going strictly via code you can install a layer over a layer. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface. This article series discusses best practices in the selection and installation of residential roofing. The standard practice is to limit to a total of two layers of shingles.

However we wouldn t recommend this practice. After that you should tear off old shingles before installing a new layer. 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 discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles. Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Re roofing with 3 tab shingles are pretty straight forward. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.

We also discuss proper asphalt shingle roof preparation for a roofover job.