How Many Layers Of Roofing Are Allowed In Nj

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.

How many layers of roofing are allowed in nj.

That limit pertains to roofs with up to a 4 12 pitch. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. However this depends upon the roof materials. If the third layer is new you should not have to do.

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. The soundness of the building you re re roofing is another consideration. Most areas only allow for a maximum of two layers. 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.

One of these major factors is cost savings. 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. For example cedar or tile roofs are only allowed one layer. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building.

Most building codes allow up to two layers of organic or fiberglass asphalt shingles. 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. In some instances 3 layers may be allowed but this is rare. 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. Rules that took effect on monday should have contractors in new jersey raising the roof since it s no longer necessary to purchase a construction permit for roofing or siding jobs on one and two. Adding a second or third layer of shingles adds significant weight to the structure. Usually shingles are replaced every 15 to 20 years.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. 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. Standard roofing practices allow for three layers of roofing 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.