How Many Layers Of Shingles On A Roof

In the portland area as of 2018 the current code allows up to three layers if the current layer is in good condition.

How many layers of shingles on a roof.

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. For example cedar or tile roofs are only allowed one layer. The homeowner will have two layers of shingles protecting the roof and the home is less likely to have ice dams he says. Disadvantages to a roof recover.

However this depends upon the roof materials. Richards also estimates that the homeowner saves at least 1 000 in costs associated with removing and properly disposing of the existing shingles. 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. That limit pertains to roofs with up to a 4 12 pitch.

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