Are there commercially available coatings that can be sprayed or brushed onto a cedar shake or shingle roof to give it a Class B fire rating?

A. Robert White, a wood scientist at the USDA Forest Products Laboratory in Madison, Wis., responds: While I can’t conclusively say that no such coatings exist, I’m not aware of any that can show the required documentation. Where a wood roof is to be used in a fire-prone area, the recommended solution is to choose shakes or shingles that have...

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