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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Products: Recommendation for insulated tile backer board?

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    • CommentAuthorSprocket
    • CommentTimeAug 15th 2019
     
    In a new bathroom on our new old house (in renovation) I specified a cavity wall with hollow concrete blocks, then 50mm airgap, 50mm PIR board, 100mm Celcon block, finally faced off with 28mm of insulated plasterboard (dot & dab fixed) to try to reduce any cold spots inside. This gets us a U vale of around 2.0 which seemed a decent compromise.

    Our foreman has just suggested that if we're going to tile inside we might be better off with an insulated (and moisture resistant) tile backer board rather than insulated plasterboard. At least in the shower and maybe everywhere. Sounds reasonable I think.

    I've looked at products available and nothing jumps out at me as "best bet". Anyone here got any recommendations?

    TIA
  2.  
    Hi,

    If you are tiling fully, why not just use XPS? The tiles have been clinging happily to my XPS for around 30+ years. Oh, and please don't dot and dab! Full perimeter beads and cross-hatchings at least, but full coverage even better.
    • CommentAuthorowlman
    • CommentTimeAug 15th 2019 edited
     
    I've used this on several occasions, from this supplier too, ( no connection), there are more expensive products but they're no better, IMO.

    https://www.pureadhesion.co.uk/tile-backer-boards.html

    P.S. Don't tile onto plasterboard, especially stone tiles.
    • CommentAuthorJeff B
    • CommentTimeAug 15th 2019
     
    I have always used Hardie backerboards. For cutting definitely use the cutter they supply as this dramatically reduces the amount of dust. It's not insulated but then I have only used it against internal wall surfaces. To insulate it would be possible to mount the boards against sheet insulation and screw right through into the wall behind.
    • CommentAuthorCWatters
    • CommentTimeAug 16th 2019
     
    +1 To Hardibacker board. We used the 12mm thick version. Its strong enough to take screws for some things without needing to find studs.

    Wedi board is a foam board with a cement/Fibreglass skin both sides designed for tiling. I used it to make a wash stand covered with travertine. Only issue is that if you ever want to take tiles off i think some of the foam may come off with them?
    • CommentAuthorKenny_M
    • CommentTimeAug 19th 2019
     
    I've also used hardie board for this in the past, and for various other things including lining fireplaces, great stuff, but the OP asked about insulated board.

    I used marmox multiboard the last time before tiles went on in a shower, easy to fix with the plastic washers they supply, but I am sure it can probably just be stuck on depending on the substrate. Found it easy to use and no issues so far. Thermal Conductivity: 0.034W/mK.
    • CommentAuthorSprocket
    • CommentTimeAug 23rd 2019
     
    Thanks for the thoughts everyone.

    Then I think I will leave the insulated plasterboard on place over the whole room and then put the conventional tile backer over that just where we need to tile. The insulated plasterboard is big sheets so it's quick and easy (though I'll look at full cover with notch trowel - the blockwork should be flat enough) and hardly worth omitting areas.
    We have used Marmox multiboard before and I had wondered about using it for the whole room but the smaller sheets are way less convenient. Most of the room will just be a skimmed plaster finish.

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