How Many Layers Of Roofing Are Allowed In Oregon

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.

How many layers of roofing are allowed in oregon.

However portland will allow up to three residential roofing layers if the structure can support it. 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. Most building codes allow a structure to have two roof membranes.

Homeowners have to also keep in mind that most roofing materials are heavy and can easily weigh over a ton. One of these major factors is cost savings. The soundness of the building you re re roofing is another consideration. 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.

People often ask our portland roofers how many layers of shingles are allowed on my roof in oregon. Item 3 in section r907 3 requires old roofing to be removed when there are two or more layers of roof covering. For example cedar or tile roofs are only allowed one layer. Your three layer roof is definitely a potential structural concern and homeowners insurance companies might consider three layers of roof shingles.

For many years it was acceptable to put even the third layer. Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio. October 3 2019 west valley city how many layers of roofing are allowed reroofing roof layer roof replacement roofing service contractor by admin although roofs are meant to last decades there will come a time that they will deteriorate and need to be replaced. To get straight to the point there should be only 2 layers of roofing materials on your roof.

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition. Generally it is fine to have three layers of shingle codes but you should check this is the case 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. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.

Adding a second or third layer of shingles adds significant weight to the structure.