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full size wood mantlet (5 in+) 12 inches away from the fireplace openings top? US - TX fire code

Home Improvement Asked by StarWind0 on May 7, 2021

TLDR, can I have a full size wood mantlet (5 in+) 12 inches away from the fireplace openings top?

I am reading the fire codes

Exposed combustible mantels or trim may be placed directly on the
masonry fireplace front surrounding the fireplace opening providing
such combustible materials are not placed within 6 inches (152 mm) of
a fireplace opening. Combustible material within 12 inches (306 mm) of
the fireplace opening shall not project more than 1/8 inch (3 mm) for
each 1-inch (25 mm) distance from such an opening.

Does this mean if I had a 3 inch mantel, which is pretty stubby, I would need 6 inches + 21 inches? 27 inches is massive. My fireplace top opening is at 37, and my ideal height (top) is 53 inches, maybe 49 inches off the ground. Or is it saying that I can have at most 6/8 inches unless its over a foot away? The wording is super confusing.

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2 Answers

"Not within 6 inches"

"Within 12 inches, 1/8 inch projection per inch from the opening" So,

7 inches away, can stick out 7/8 inch

10 inches away, can stick out 1-1/4 inch

12 inches away, can stick out 1-1/2 inch

13 inches away, stick it out as far as you like.

Not confusing at all, IMHO.

TLDR: No you cannot have a 5 inch mantel 12 inches from the opening.

Correct answer by Ecnerwal on May 7, 2021

Or, you could check out concrete mantle options that look like real wood and ... boom ... mind-blown. LOL. Moreover, this mantle would serve as a heat shield and enable you to install a high-end TV above the mantle without fear of heat destroying the TV. Good luck...

Answered by riffin-rich on May 7, 2021

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