How Many Layers Of Shingles Are Allowed On A Roof In Kentucky

Finally consider whether reroofing over the.

How many layers of shingles are allowed on a roof in kentucky.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. In some situations depending on type of material and assembly the code does not allow any layers of existing roofing materials to remain under new roof covering. There are important reasons why this code is in effect. However this depends upon the roof materials.

The old shingles become a layer that can foster mildew growth and trap layers of moisture. 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. The average 30 square roof uses 90 bundles of shingles and a bundle of asphalt roofing shingles weighs about 100 pounds which means you re putting roughly 9 000 additional pounds of weight on your roof. 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.

Adding a second or third layer of shingles adds significant weight to the structure. 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. Some home insurance policies will not cover roof repairs that include multiple layers of shingles. Most building codes allow up to two layers of organic or fiberglass asphalt shingles.

That limit pertains to roofs with up to a 4 12 pitch. So how many layers of roof shingles are allowed. According to the international existing building code homes can be re roofed one time by applying a second layer of roof shingles over the existing one but after that application begins to wear both layers need to be removed before a brand new roof is installed. The soundness of the building you re re roofing is another consideration.

This will also be constrained by other factors. In some instances 3 layers may be allowed but this is rare. For example cedar or tile roofs are only allowed one layer. New roof covering materials are generally allowed to cover only one layer of existing roofing material.