How Many Layers Of Roof Shingles Are Allowed In Nj

Usually shingles are replaced every 15 to 20 years.

How many layers of roof shingles are allowed in nj. New jersey call 908 757 3400. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. Regulations allow a maximum of two layers of shingles on a roof but experts say you shouldn t lay asphalt shingles over an existing roof. 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. Three slate roof the new jersey home inspection includes a visible inspection of the exposed roof areas of the roof. For example cedar or tile roofs are only allowed one layer. This will also be constrained by other factors.

For many years it was acceptable to put even the third layer. That limit pertains to roofs with up to a 4 12 pitch. Most areas only allow for a maximum of two layers. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.

Generally it is fine to have three layers of shingle but you should check this with your local building permit people and you should make sure that your roof and the rest of the structure have the strength to cope with the extra weight. However this depends upon the roof materials. Standard roofing practices allow for three layers of roofing shingles. If the third layer is new you should not have to do.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. It is not illegal. In some instances 3 layers may be allowed but this is rare. Steep sloped roof products such as tile slate metal and shakes only allow one layer.

Asphalt shingles typically can have one more layer added over the top two roofs total.