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question about closing in my quadrafire 7100

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by ymurf, Feb 25, 2013.

  1. ymurf

    ymurf Member

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    I am finally getting back to work on the fireplace. I have been sheetrocking and everything else. I am putting the wonder-board on the front. I need to make a cardboard template for the top of the fireplace on my last piece. I was wondering if I should also concrete board the front of the hearth? I am pretty sure I am going to use the cultured stone lowes sells that they carry in stock.Its a dry stack that says you can glue it to wood or concrete board. But was wondering if I needed the front and sided of the hearth covered to be safe or is the way I got it ok?I also bought the high heat caulk to do the seams when I get the rest of the board on.Here is a shot of the addition and one of the fireplace where I left it tonight.
    [​IMG]
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  2. Coog

    Coog Member

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    Where is your non combustible material? There should be some red painted board that go on the sides and top of the front face. Check out the install manual, they detail it pretty well. Also be sure to construct the hearth with non combustible material. Besides the ceramic or stone on the hearth, there needs to be an equivalent r value of 2.05 underneath. An inch of cement board is not sufficient. I put two layers of half inch Micore 300.

    I try not to cut any corners on these installs. There is a lot of heat coming out of these things. The consequence of doing it wrong is far too great. Plus the insurance company would not tolerate it.
  3. ymurf

    ymurf Member

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    I read in the manual no combustion material in front and 1" clearance on the sides.I have 1/2" concrete board across the whole front.Dont have any red boards.So 1/2" concrete board isnt good enough?
  4. ScotO

    ScotO Guest

    Your pictures arent opening in your post.....
    I wouldn't be using glue for the stones on the face of that fireplace......that glue surely has to be combustible. You should probably be using cement. I'd go the extra mile and make sure you go above and beyond the codes on your install and you'll never have any worries (with your house, family safety, OR insurance). Like Coog said, they put out an amazing amount of heat.......
  5. Hurricane

    Hurricane Minister of Fire

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    I agree with not using the glue. It is combustible even when dry. I do not know how it will hold up to the heat either. I had a friend use some on his fire pit until I stopped him and what he did have on there did not catch fire but it definitely gave off an odor, so he took it apart and chiseled off the glue.
  6. ymurf

    ymurf Member

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    It looks like in the manual that the cement board is ok in the front of the fireplace.But not the hearth unless its 4" thick.So I can get some USG Micore 300 and put that on the top of the cement board and that will be ok?
  7. ymurf

    ymurf Member

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    Ok guys after doing some more reading it looks like I need to put two 1/2" of USG Micore 300 if I ever find any on top of my 2x10 frame then I can put my 1/2" cement board on that and screw it down then the rock on that? This sound right?
  8. Coog

    Coog Member

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    The two layers of Micore 300 can sit directly under your non combustible finished surface (stone, ceramic tile,etc.). The hearth is also supposed to be constructed of non combustible framing. Did the unit come with white board to fasten to front face? I just bought my 7100 about four months ago and it was included.
  9. ymurf

    ymurf Member

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    No white board,I bought it slightly used and he said he didnt remember getting any.
  10. ymurf

    ymurf Member

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    I dont quite understand why you can make a hearth on the subfloor by putting 1" of fiber board and your concrete board and stone on that but if you have a raised hearth you cant do the exact same thing on top of that? Makes no sense.
  11. Coog

    Coog Member

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    In the install manual, Page 15 spells out the facing material requirements and page 37 and 38 spell out the hearth extension requirements. For some reason, if the hearth extension is not raised, placing the two layers of Micore on the subfloor is adequate. If the hearth is raised, the install manual says the interstitial space framing components must be non combustible.
  12. ymurf

    ymurf Member

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    Yea I read that.Just dont make sense you can put it on wood sub floor but not if its raised.Wonder what makes the difference?
  13. Coog

    Coog Member

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    I don't know either. I just used steel studs in that area to be safe. I think I actually read an old manual that did not require it. It may even be the one on the website.
  14. rideau

    rideau Minister of Fire

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    That's a nice looking addition.
  15. ymurf

    ymurf Member

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    Thank you.Its a little cluttered right now.need to do a clean up before I start taping and mudding.

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