Is hearth extension size based on raw opening or door opening?


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Old 11-18-17, 11:58 AM
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Is hearth extension size based on raw opening or door opening?

Hey guys..

Got a 38"x32" masonry fireplace (opening)... I'm doing subfloor in the room and need to figure out hearth extension size. I'm in Illinois if that matters at all... but on looking at codes, it appears that for any fireplace with an opening over 6' square, the hearth extension is supposed to be 20" extended outward and 12" extended to the sides. That's going to look excessively huge in my living room. I'll do it if I must, but I was wondering if once the fireplace doors are installed if it effects what would be considered the "fireplace opening"? I'm looking at glass doors and most of them would shrink the "opening size" of my fireplace down below 6' square... in which case I could go with a 16"/8" hearth extension, which would fit my room size much better.

So do I have to measure the raw opening as it is now to size a hearth extension? Or can I use the size of the finished opening with the doors that I plan to install right after my subfloor is done?

Thanks
Brian
 
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Old 11-18-17, 12:08 PM
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Doors do not count as a means of reducing the fireplace opening size, since doors can be removed and the code is based on the actual fireplace opening.
 
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Old 11-18-17, 02:25 PM
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Well sonofa*****. So I've gotta go with 20"/12" then eh? Guess I'll make it work. Thanks man.
 
 

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