That limit pertains to roofs with up to a 4 12 pitch.
How many layers of roofing are allowed in nj.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
Most building codes allow up to two layers of organic or fiberglass asphalt shingles.
Most areas only allow for a maximum of two layers.
Now you just have to decide whether to remove the existing roof shingles or recover the roof.
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According to the international existing building code homes can be re roofed one time by applying a second layer of roof shingles over the existing one but after that application begins to wear both layers need to be removed before a brand new roof is installed.
This will also be constrained by other factors.
Standard roofing practices allow for three layers of roofing shingles.
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.
In some instances 3 layers may be allowed but this is rare.
For many years it was acceptable to put even the third layer.
Third roofs are illegal and it s been up to the construction code official to enforce that lacosta said.
There are important reasons why this code is in effect.
If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job.
Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4 12 pitch or less and three layers on steeper roofs.
Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.
When it s time to replace your roof there are several factors that might lead your roofing professional to recommend adding shingles on top of your existing layers.
The contractor may do a walk on the roof and also inspect from the attic for any rot before installing a second layer of shingles.
Usually shingles are replaced every 15 to 20 years.
However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building.
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The ice barrier shall consist of not fewer than two layers of underlayment cemented together or a self adhering polymer modified bitumen sheet shall be used in place of normal underlayment and extend from the lowest edges of all roof surfaces to a point not less than 24 inches 610 mm inside the exterior wall line of the building.
