Problems With Re Roofing A House Over Existing Shingles

Void your shingle warranty.

Problems with re roofing a house over existing shingles.

Add excessive weight to the structure of your house. This article series discusses best practices in the selection and installation of residential roofing. Diminish the overall life of the roof. In fact the only pro to a shingle over is it s cheaper and cleaner.

Before you reshingle a roof read our step by step guide for adding new shingles over old ones. Asphalt roof shingle re roofing advice. Hope you like it. Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.

Be sure to check with the shingle manufacturer regarding all warranty issues and installation requirements before re roofing. Many restrict a number of times you can layer the roofing. Looks just as good and lasts as long. However layering roofing can.

Re roofing may affect the warranty on the new shingles. Local codes might not allow re roofing. All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof. Reroofing is the process of layering one set of new shingles over a set of existing shingles.

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. Has the same manufacturer s warranty. It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you. If your roof is in good shape but has some damage to one side from a downed tree or has lost shingles in a wind storm an overlay is worth considering.

Before considering layering roofing over an existing roof it s important to check your local building codes. Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros. Installing a new roof over shingles takes less time than tearing off the old roof. 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.

Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage. Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles. We also discuss proper asphalt shingle roof preparation for a roofover job. Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.

This article discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles. Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.