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.

How many layers of roofing are allowed in nj.

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. That limit pertains to roofs with up to a 4 12 pitch. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. Underlayment shall be applied shingle fashion parallel to and starting from the eave and lapped 2 inches 51 mm fastened sufficiently to hold in place.

In some instances 3 layers may be allowed but this is rare. One of these major factors is cost savings. It is not illegal. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. Adding a second or third layer of shingles adds significant weight to the structure. In lower bergen county new jersey alpine nj 07620 home inspection for bergenfield nj 07621 area we have home inspectors for bogota nj 07603 area licensed home inspector for carlstadt nj 07072 area g warren has licensed home inspector for cliffside park nj. 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.

Home inspector nj bergen county with zip codes the g warren inc nj home inspection directory serving these new jersey cities. For roof slopes of four units vertical in 12 units horizontal 33 percent slope or greater underlayment shall be one layer applied in the following manner. If the third layer is new you should not have to do. For many years it was acceptable to put even the third layer.

Apply a 19 inch strip of underlayment felt parallel to and starting at the eaves. However this depends upon the roof materials. Most areas only allow for a maximum of two layers. The soundness of the building you re re roofing is another consideration.

For roof slopes from two units vertical in 12 units horizontal 2 12 up to four units vertical in 12 units horizontal 4 12 underlayment shall be two layers applied in the following manner. 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. Standard roofing practices allow for three layers of roofing shingles. Usually shingles are replaced every 15 to 20 years.