How to grout a slate floor under a wood stove?

Post in 'DIY and General non-hearth advice' started by georgepds, Dec 11, 2012.

  1. georgepds

    georgepds
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    Burning Hunk

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    Not sure I’m in the right place for this question. I have a Jotul combi fire #4 ( the one that looks like an Easter island head) . It sits on a grouted slate floor

    After years of use the grout has dried and the slates have come loose. My best guess is I used the wrong grout when I laid the tile some 20 years ago

    I need a recommendation as to how to best lay the slate so it does not come loose
     

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  2. ScotO

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    First, make sure the substrate (the surface UNDER the tile) isn't to blame for the grout failing. If you are going to re-do the slate tile, it'd probably be good insurance to put some cement board (Durock NextGen or Hardibacker) down for a new, clean, and ready-to-go surface for your tile......Use good thinset and good grout, and it'll be a cakewalk.......
     
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  3. Tramontana

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    Burning Hunk

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    On the plus side, it worked for 20 years, but a slate floor should have held up longer, and I would suspect a material failure somewhere.

    If you are going to replace/reset the entire floor I agree with Scotty, clean everything really well, install a good cementitious backer board and use quality thin set and grout. These are not products to skimp with IMHO.

    Cheers!
     
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  4. stee6043

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    Minister of Fire

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    Anyone that says tile is a cakewalk is either a professional or is just plain crazy! ha.
     
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  5. Eatonpcat

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    Tile is very easy in my opinion!
     
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  6. georgepds

    georgepds
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    Burning Hunk

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    Thank you both


    I'm going to replace the Jotul with a progress hybrid.. which calls for a subfloor with an r ~0.8. With an "ash lip" (do they mean ash pan?) this goes down to 0.4.

    1/2" Cement board, R=0.39, and tile, R=0.02, meets this lower spec

    One thing I'm thinking about is mineral board under the tile.I found one product below, it has an R=1.04.. My tile area is roughly 4x6 so I'd need several sheets ( they come 2x4). The advantage would be to exceed the R spec

    Anyone have any experience with mineral board? Anyone know another vendor?

    TIA

    --G


    SBI Micore-300 Mineral Fiber Board -

    http://www.efireplacestore.com/sbi-ac02565.html?productid=sbi-ac02565&channelid=FROOG&gclid=CK3yo-PUk7QCFS-RPAodDgcAGA
     
  7. georgepds

    georgepds
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  8. georgepds

    georgepds
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  9. firefighterjake

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    Not a professional . . . or plain crazy . . . just very methodical and I listened to what folks here were saying about how to build a hearth and tile . . .
     
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  10. ScotO

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    tile is a Cakewalk.....

    Now hanging stone veneer is a tad harder....this is what I'm into right now....

    No I am NOT a professional. Yes I AM crazy......
     

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  11. fishingpol

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    Good advice already, they gave you a good start. 20 years did well for you. I did a slate for my hearth rebuild. I removed the old wood that had split and dried out resulting in cracking mortar and loose tiles. If putting in a PH, make sure you have plenty of strength in the floor below it to reduce deflection which would cause popped tiles. I rebuilt using metal joist hangers, new 2 x's toenailed in. Construction adhesive on top of the 2 x's, 3/4" plywood screwed and glued down, then hardi and concrete to bring it to level. There will be a lot of weight sitting on that hearth. Good luck. Be sure to put up some before and after photos.
     
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