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Old 02-09-2015, 09:25 PM   #1
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Code for a fireplace hearth?


This question has arose;

With a masonry fireplace where the firebox is elevated 16" from the floor surface, what is the hearth requirement?

Is there a specific code for this?
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Old 02-09-2015, 10:01 PM   #2
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check with your local building department. also any manufacturers regulations must be followed
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Old 02-09-2015, 10:20 PM   #3
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All codes vary, and it depends on if it's a natural conventional FP, or a zero-clearance unit, but typically, the range is 16" to 20" from the opening for combustable flooring.........
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Old 02-09-2015, 11:42 PM   #4
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Quote:
Originally Posted by jomama45 View Post
All codes vary, and it depends on if it's a natural conventional FP, or a zero-clearance unit, but typically, the range is 16" to 20" from the opening for combustable flooring.........

Thanks something like I was thinking. It's not for me, but I told the friend he should check with his local building department to be sure.


It's a masonry wood burning fireplace with a typically overly large hearth that he'd like to remove. Probably like mine, the lower lip of the firebox is around 16" from floor level. Currently has tile floor but he's thinking he'll change to hardwood flooring.

From sides to flammable material isn't an issue, nor is top of firebox to mantle since there is none. It's just the distance from lower lip of firebox to floor that is of concern...


Thanks for the timely reply...
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Old 02-10-2015, 11:08 AM   #5
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My masonary brick fireplace has firebox 10" off of the floor, the hearth is an 8" wide piece of blue slate, hardwood runs right up to the brick below the hearth, passed all inspections in MY town. But who knows if it would pass in another. Ask the person(s) who will do the inspection. Here it is the building inspector with a secondary look from the Fire Marshall. Ron
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Old 02-10-2015, 12:01 PM   #6
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Most manufacturers of both free standing and wood burning inserts recommend 16" out from the door but there are a few that recommend 24".
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Old 02-10-2015, 09:39 PM   #7
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Quote:
Originally Posted by ktkelly View Post
Thanks something like I was thinking. It's not for me, but I told the friend he should check with his local building department to be sure.


It's a masonry wood burning fireplace with a typically overly large hearth that he'd like to remove. Probably like mine, the lower lip of the firebox is around 16" from floor level. Currently has tile floor but he's thinking he'll change to hardwood flooring.

From sides to flammable material isn't an issue, nor is top of firebox to mantle since there is none. It's just the distance from lower lip of firebox to floor that is of concern...


Thanks for the timely reply...

Just to be sure there's no confusion, the height of the raised hearth is irrelevent. Not sure if that's what you're questioning or not, but it doesn't matter. The only thing to be concerned with is the width and depth of the hearth itself. Here's a link to a simple table from our code in WI that outlines the minimums. From what you are saying, it sounds like the opening is likely greater than 6 sq. feet, so the larger hearthstone dimensions apply:

https://docs.legis.wisconsin.gov/cod...20_325/321.pdf

(Page 53, Table 321.29−1.)
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