Asphalt shingles typically can have one more layer added over the top two roofs total.
How many layers of roof shingles are allowed in ny.
Once you have discovered how many layers of roof shingles are allowed the next decision you should make is whether you will have the existing shingles completely removed to make way for two or three new layers or whether you will have another layer of shingles placed on top of the existing layer.
Re roof or strip the roof down.
Any amount of short term savings you might see from a layover roof installation is not far outweighed by the longer term peace of mind that comes from knowing that the integrity of the decking has been confirmed.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
But contractors who spoke with angie s list say best practices call for stripping the roof down to the wood deck to inspect it before installing a new roof.
How many layers of shingles are allowed on a roof.
Re roof or strip the roof down.
Once you have discovered how many layers of roof shingles are allowed the next decision you should make is whether you will have the existing shingles completely removed to make way for new shingles or whether you will have another layer of shingles placed on top of the existing layer.
Consistent leaks shingle loss and mold growth can all point to the need for a new roof.
For many years it was acceptable to put even the third layer.
Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.