How Many Layers Of Roofing Are Allowed In Nyc

That limit pertains to roofs with up to a 4 12 pitch.

How many layers of roofing are allowed in nyc.

Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles. To get straight to the point there should be only 2 layers of roofing materials on your roof. However this depends upon the roof materials. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says.

However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. The soundness of the building you re re roofing is another consideration. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. 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.

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. Disadvantages to a roof recover. For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers. Two layers is the maximum in most areas but some building codes allow only one.

Homeowners have to also keep in mind that most roofing materials are heavy and can easily weigh over a ton. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. 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. In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition.

How many should there be. Local codes might not allow re 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. For example cedar or tile roofs are only allowed one layer.

For many years it was acceptable to put even the third layer. 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.