Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
Problems with re roofing a house over existing shingles.
Installing a new roof over shingles takes less time than tearing off the old roof.
Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles.
This article discusses how to prepare an existing asphalt shingle roof for a roof over or for re roofing with new asphalt shingles.
Two layers is the maximum in most areas but some building codes allow only one.
Has the same manufacturer s warranty.
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.
Re roofing may affect the warranty on the new shingles.
However layering roofing can.
Many restrict a number of times you can layer the roofing.
Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.
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.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
Manufacturers will still.
Be sure to check with the shingle manufacturer regarding all warranty issues and installation requirements before re roofing.
This article series discusses best practices in the selection and installation of residential roofing.
Asphalt roof shingle re roofing advice.
All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.
Void your shingle warranty.
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.
Before considering layering roofing over an existing roof it s important to check your local building codes.
In fact the only pro to a shingle over is it s cheaper and cleaner.
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.
Add excessive weight to the structure of your house.
Reroofing is the process of layering one set of new shingles over a set of existing shingles.
Diminish the overall life of the roof.
Hope you like it.
Looks just as good and lasts as long.
Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
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.
