How Many Layers Of Roofing Are Allowed

To get straight to the point there should be only 2 layers of roofing materials on your roof.

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. For many years it was acceptable to put even the third layer. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. Wednesday august 1 2018 you are allowed to put one additional layer of roofing over an existing roof which is called a reroof.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. This roofing system has two layers of material. The soundness of the building you re re roofing is another consideration. 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.

Most building codes allow up to two layers of organic or fiberglass asphalt shingles. 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. 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 this depends upon the roof materials. For example cedar or tile roofs are only allowed one layer. Homeowners have to also keep in mind that most roofing materials are heavy and can easily weigh over a ton. 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. While this is acceptable under the florida building code it is the maximum number of layers allowable. A re roof might not look good on an inspection report. For example towns in climates with heavy hailstorm activity or significant ice dam problems may not allow multiple roofing layers.

However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. 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.