How Many Layers Of Roofing Are Allowed

Most building codes allow up to two layers of organic or fiberglass asphalt shingles.

How many layers of roofing are allowed.

While putting a roof on a home or building seems like a relatively standard job there are many regulations that must be followed to ensure the job is done right. The soundness of the building you re re roofing is another consideration. How many layers of roofing are allowed on a home. Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.

On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. For example cedar or tile roofs are only allowed one layer. When replacement is required there will likely be an added expense in removal and disposal of the material it s not a deficiency so i just give an informational statement. In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition.

A re roof might not look good on an inspection report. Two layers is the maximum in most areas but some building codes allow only one. That limit pertains to roofs with up to a 4 12 pitch. But once there are two layers of roof you must strip off both layers down to the deck the next time you need a roof which is a roof replacement.

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. For many years it was acceptable to put even the third layer. While this is acceptable under the florida building code it is the maximum number of layers allowable. A roofing contractor will know exactly how many layers of roof shingles are allowed in your area for your building but it is normal that you will be permitted up to three layers of shingles.

Wednesday august 1 2018 you are allowed to put one additional layer of roofing over an existing roof which is called a reroof. California roofing codes establish a list of rules that all builders and contractors must adhere to in order to ensure safe building practices within the state. In most cases two layers of shingles is advisable and three aren t normally required but if you live in an area that suffers from particularly strong wind or lengthy periods of heavy rain then you may want to consider a third layer. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building.

Homeowners have to also keep in mind that most roofing materials are heavy and can easily weigh over a ton. This roofing system has two layers of material. However this depends upon the roof materials.