4 inch non combustable shelf3/5/2024 ![]() ![]() For instance, according to some manufacturers, 8-10 inches is all that's required for mantel clearance from the top of the firebox (depending on one inch of clearance for every one inch in projection). until I learned that many municipalities have more stringent requirements. I used to defer to the manufacturer's specs, too. For a fireplace, you go with local building specs. We have done a lot of mantels and have always deferred to the manufacturer's specs in the owner's manual. Type of fireplace may also come into play with codes. It is common knowledge that the flammability of wood changes as you cross county lines. That code requirement is not at all universal, which is pretty silly. I agree with the code check! I got caught once using LA requirements on a home in Thousand Oaks (Ventura County, CA), which is right next door. Most fireplaces require 12" vertical of noncombustible material, then allow 1" projection per 1" of rise (45 degree) to a maximum depth of 12" above the top of the firebox (12" depth at 24" above).
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