1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)

Cement board research....

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by Gooserider, Sep 11, 2007.

Thread Status:
Not open for further replies.
  1. ScotO

    ScotO Guest

    you got a point there Fred....I've had blue balls before but never purple......lol.....

    Helpful Sponsor Ads!





  2. ScotO

    ScotO Guest

    Thanks BeGreen......I like using the Durock, esp. for any veneer job I am doing, but wasn't sure about that stuff....the stuff I bought two years ago did not have perlite in it.....did they recently start putting it in the board?......
  3. pen

    pen There are some who call me...mod. Staff Member

    Joined:
    Aug 2, 2007
    Messages:
    7,112
    Loc:
    N.E. Penna
    Not saying that I recommend this (I'll say it again, DO NOT DO IT), but my buddy who's an oaf has a 30 and destroyed his baffle boards. Rather than cough up the 120 bux or so for 2 new ones, he went out and bought a sheet of next gen durorock. He cuts them and uses them in place of the factory baffle. He puts a new set in at the beginning of winter, and changes it out once during the winter. 2 sets get his stove through an entire season. He burns about 5 cord of wood through his 30. The wood stove is his only heat.

    If it can survive for months IN a stove, I have no concerns placing it under one.

    pen
  4. ScotO

    ScotO Guest

    Pen I have read on this forum different guys who do that......and I will +1 on what you said...DON'T DO IT.......if for nothing else, say those boards fail in the middle of the night and next thing you know your stove top is exposed to full heat from the fire, then warps all to hell.....but like you said, if it can withstand heat like that, surely it is good enough for the underlayment or for the surround....
  5. mhrischuk

    mhrischuk Guest

  6. begreen

    begreen Mooderator Staff Member

    Joined:
    Nov 18, 2005
    Messages:
    49,610
    Loc:
    South Puget Sound, WA
    The warehouses started emptying out of the old pure cement board products last year. To my knowledge they are no longer available unless found in the dusty recesses of a quiet lumber yard. Hardibacker may be fine, but I'm reticent to recommend it because it has cellulose mixed in. The competing product made by USG is Fiberock which specifically says to not use the product in high temp locations.

    As you have noted, this discussion is as old as Elk from days before this forum started. It comes up annually and has been confused by the NextGen products. We do the best we can to investigate and respond based on the current market options. There is only one agenda here and that is to help others to make their installations safe and functional. If the recommendation seems narrow, it is because the answer speaks not just to a single installation, but to the hundreds that will read the thread later on.
  7. Jags

    Jags Moderate Moderator Staff Member

    Joined:
    Aug 2, 2006
    Messages:
    15,256
    Loc:
    Northern IL
    Well spoken BG. I really comes down to the fact that the Nexgen Durock has NOT been tested in the USA for hearth applications. That doesn't mean it is not the proper product, it just has not been tested for it in the US (it HAS been tested in Canada, an meets their requirements)
  8. mhrischuk

    mhrischuk Guest

    And it is the exact same product, manufactured in the US in the same factory and shipped to Canada. (I was told by USG)
  9. PROOT

    PROOT New Member

    Joined:
    Sep 14, 2013
    Messages:
    9
    Does anyone have new info on Durock nex gen vs permabase
  10. begreen

    begreen Mooderator Staff Member

    Joined:
    Nov 18, 2005
    Messages:
    49,610
    Loc:
    South Puget Sound, WA
    Last edited: Oct 6, 2013
  11. timusp40

    timusp40 Feeling the Heat

    Joined:
    Feb 3, 2010
    Messages:
    266
    Loc:
    Lake Orion, Michigan

    From the Woodstock Web Site,
    Technical Note: Conductivity
    Cement backer board is an ideal material for a hearth pad because of
    its low “k”, or conductivity value. Conductivity is the ability to conduct
    heat. The lower the “K” factor, the less heat is conducted through
    the material. For example, Durock has a k-value of 1.92 per inch, as
    compared to the k-value of common brick, which is 5.00 per inch, or
    marble, which has a k-value of 15.00 to 20.00 per inch.

    So I put 1" of next gen under my tile. Passed inspection here in Michigan no problem.
    Take Care,
    Tim
Thread Status:
Not open for further replies.

Share This Page