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Old 02-12-2012, 06:37 AM   #1
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Durock Question


I may be overthinking this, but have to ask. Couldn't find the answer on USG's website.

I'm installing a hearth in my log home for a wood stove. Behind the stove will be an air space, a layer of 1/2" Durock, then 2-inch thick manufactured stovne veneer. My question is about the Durock. It is Class A fire rated, but it isn't fire I'm concerned about. Durock has some sort of mesh material in it. I don't know what it's made of, but it cuts easily with a utility knife. Will this material melt from the constant heat where the the masonry thimble passes through the Durock, and somehow compromise the installation? Do I need to hold the rock away from the thimble some distance? Any advice would be appreciated. Thanks.

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Old 02-15-2012, 12:57 AM   #2
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Originally Posted by md2lgyk View Post
I may be overthinking this, but have to ask. Couldn't find the answer on USG's website.

I'm installing a hearth in my log home for a wood stove. Behind the stove will be an air space, a layer of 1/2" Durock, then 2-inch thick manufactured stovne veneer. My question is about the Durock. It is Class A fire rated, but it isn't fire I'm concerned about. Durock has some sort of mesh material in it. I don't know what it's made of, but it cuts easily with a utility knife. Will this material melt from the constant heat where the the masonry thimble passes through the Durock, and somehow compromise the installation? Do I need to hold the rock away from the thimble some distance? Any advice would be appreciated. Thanks.
I've actually never asked myself that question.

I'm guessing you're buying it from Home Depot or Lowes?

Ask an assistant they usually take courses covering these kinds of questions.

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Old 02-15-2012, 06:18 AM   #3
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Class A fire rated, according to their website. A simple search would tell tou.
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Old 02-15-2012, 06:33 AM   #4
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You will be fine---use the Durrock---
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Old 02-15-2012, 06:04 PM   #5
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Thanks. Already did.
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Old 02-15-2012, 06:11 PM   #6
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I have a sheet propped right behind my wood stove,as a heat shield---been there for 3 years ---that one gets cooked---it's holding up just fine.
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Old 02-15-2012, 06:13 PM   #7
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teh mesh your talking about is usually fibreglass if i remember correclty.. as for airspace last time i checked you need 2 1/2" between the fireplace and the framing but check your local codes
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Old 02-18-2012, 07:25 AM   #8
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I put a piece of Durarock into my woodstove just to see how it held up. The stove ran a cycle that maxed out at 600deg. surface temp - maybe 1000deg interior. And the durarock was only slightly discolored in a few places.

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