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Old 12-19-2013, 06:41 PM   #1
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gas fireplace clearance


I have a quick question regarding gas fireplace clearances. Some of the models I have looked up require about an inch clearance from combustibles. My question is when you frame for the fireplace your obviously going to use wood and your mounting the fireplace box to that framing. Does that mean you have to keep the actual fireplace box up from where it sits so it doesn't contact the wood? Also when you to create a surround whether its drywall, cement board, etc. that is combustible so do you have if you have to keep those materials an inch from the box what do you do about the gap?

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Old 12-19-2013, 10:51 PM   #2
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gas fireplace clearance


There's going to be a face frame that sticks out on the top and sides to cover the gap.
Should really be using steel studs and 5/8 fire rock.

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Old 12-20-2013, 08:31 AM   #3
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gas fireplace clearance


code in my area is 2" from brick when framing the hole for the fireplace. 2" all around...
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Old 12-20-2013, 08:42 AM   #4
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Originally Posted by joecaption View Post
There's going to be a face frame that sticks out on the top and sides to cover the gap.
Should really be using steel studs and 5/8 fire rock.
how do you attach cement board to steel studs? Steel studs can't support anything.
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Old 12-20-2013, 08:47 AM   #5
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gas fireplace clearance


Steel studs are used all the time in commercial construction and support the drywall just fine.
Just tile over the drywall.
Use fine thread drywall screws.
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Old 12-20-2013, 10:43 AM   #6
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Originally Posted by joecaption View Post
Steel studs are used all the time in commercial construction and support the drywall just fine.
Just tile over the drywall.
Use fine thread drywall screws.
If i went with cement board would cement board screws work ok with steel studs?
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Old 12-20-2013, 11:26 AM   #7
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gas fireplace clearance


I take it part of your concern is the hearth, on which the FP unit will sit on? That's typically built out of wood with sheating. The bottom of these units is designed to sit on combustables, as long as the unit says so in the instructions. Steel studs won't work well for this...........

As for the sides and top, the unit will have "stand-off's" to show how far the wood needs to stay away, and allow the heat to dissipate before it contacts the wood framing. All of this will be included in your instructions.........
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Old 12-20-2013, 11:28 AM   #8
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gas fireplace clearance


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Originally Posted by hand drive View Post
code in my area is 2" from brick when framing the hole for the fireplace. 2" all around...
Those are clearances for a solid-fuel (wood) burning masonry FP, I believe the OP is talking about a zero-clearance gas unit........
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Old 12-20-2013, 12:09 PM   #9
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I take it part of your concern is the hearth, on which the FP unit will sit on? That's typically built out of wood with sheating. The bottom of these units is designed to sit on combustables, as long as the unit says so in the instructions. Steel studs won't work well for this...........

As for the sides and top, the unit will have "stand-off's" to show how far the wood needs to stay away, and allow the heat to dissipate before it contacts the wood framing. All of this will be included in your instructions.........
what will cover the clearance gap though if you cant have framing touching it?
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Old 12-20-2013, 12:16 PM   #10
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Typically, drywall..........
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Old 12-20-2013, 01:05 PM   #11
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Typically, drywall..........
but drywall is combustible and supposed to have that clearance from the firebox. What covers the clearance gap?
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Old 12-20-2013, 01:17 PM   #12
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gas fireplace clearance


Is this indeed a factory built gas, zero-clearance unit?

If so they have a front faceplate, gererally black steel, which has a 1/2" deep indent that's intended to flush out with drywall. You don't need 1" clearance on the front faceplate, unless of course you buy some non-conventional FP of course.......
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Old 12-20-2013, 02:16 PM   #13
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when you purchase a gas fireplace do they give you instructions on what dimensions to frame or do you frame the opening larger to account for the clearance?
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Old 12-20-2013, 03:54 PM   #14
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You can go on line and see the exact framing and clearances that needs to be done.
I used to do all the enclosures for my local gas company and they would hand me a 3 or 4 page print out of how it needed to be framed.
All of them suggested steel framing and 5/8 fire rated drywall.
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Old 12-20-2013, 09:53 PM   #15
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Originally Posted by detroittigerfan View Post
when you purchase a gas fireplace do they give you instructions on what dimensions to frame or do you frame the opening larger to account for the clearance?
The installation manual will tell you everything and then some: Rough framing dimension, clearance to combustables, min. and max. chimney dimensions, etc...

As the other Joe said, you can find most of these manuals online, at least for the popular units.

It's not uncommon for rough carpenters to get in contact with the FP installers when they frame these out, or even get the manual ahead of time. if you're not certain, I would suggest making the rough opening slightly larger and having some extra material around to pad the opening inward as necessary when the installers show up........

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