Beveled wood pieces called horsefeathers must be laid along the thick edges of the shakes to make a fairly flat surface.
Problems with re roofing a house over 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.
This article series discusses best practices in the selection and installation of residential roofing.
Re roofing may affect the warranty on the new shingles.
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.
Asphalt roof shingle re roofing advice.
Be sure to check with the shingle manufacturer regarding all warranty issues and installation requirements before re roofing.
Before you reshingle a roof read our step by step guide for adding new shingles over old ones.
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.
Here is a video on how we lay a second layer of asphalt shingles over existing asphalt shingles.
Although it sounds like a good idea we can assure you the cons heavily outweigh the pros.
Many restrict a number of times you can layer the roofing.
However layering roofing can.
We also discuss proper asphalt shingle roof preparation for a roofover job.
Hope you like it.
Void your shingle warranty.
Diminish the overall life of the roof.
Before considering layering roofing over an existing roof it s important to check your local building codes.
Installing a new roof over shingles takes less time than tearing off the old roof.
Reroofing is the process of layering one set of new shingles over a set of existing shingles.
All shingle manufacturers honor the warranty whether their products are used for a reroof or a new roof.
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.
It can only be done once so if you already have two layers of roofing in place reroofing is not an option for you.
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.
Looks just as good and lasts as long.
Asphalt shingles can be laid over cedar shakes or shingles however this is a roofing project best left to pros.
Local codes might not allow re roofing.
Manufacturers will still.
Because there is no tear off reroofing can go much faster and be much less expensive than a complete roof replacement.
