How Many Layers Of Roofing Are Allowed

For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers.

How many layers of roofing are allowed.

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. 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. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.

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 the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. While this is acceptable under the florida building code it is the maximum number of layers allowable. Wednesday august 1 2018 you are allowed to put one additional layer of roofing over an existing roof which is called a reroof.

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. For many years it was acceptable to put even the third layer. Most building codes allow up to two layers of organic or fiberglass asphalt shingles. A re roof might not look good on an inspection report.

Homeowners have to also keep in mind that most roofing materials are heavy and can easily weigh over a ton. How many layers of roofing are allowed on a home. Two layers is the maximum in most areas but some building codes allow only one. However this depends upon the roof materials.

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

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. This roofing system has two layers of material. The soundness of the building you re re roofing is another consideration.