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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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    • CommentAuthordelprado
    • CommentTimeFeb 22nd 2018
    Anyone got any tips here? I understand you cannot use wood fibre, which is a shame, as thats what I am using everywhere else
    • CommentAuthoradam_w
    • CommentTimeFeb 22nd 2018
    What about The Underfloor Heating Store tile backer board? I've only used it for floors but its supposed to be suitable for walls as well providing you use enough of the right type of fixings plus it has a U value of 0.027 which is pretty good for the cost!



    • CommentTimeFeb 22nd 2018
    The issue clearly is water, both as high levels (condensing high) of vapour and as liquid water jets in places.

    So you can use wood fibre, or any other hygroscopic, organic insulation, but you need to be careful. You need to think about how it will dry and how to protect it against liquid water in particular.

    I'm mad. I have straw bales covered in lime plaster inside two of my showers. It seems to be OK. But one wall is quite far from the shower head and only gets a few drops splashed on it. I've covered that area with Stormdry clear coating. The wall in the other shower is a bit closer to the water, so I've put a waterproof roller blind on the ceiling so it can be rolled down to act as a rainscreen for the wall when we use that shower. Then rolled up afterwards to allow the wall to dry fully. MVHR helps a lot of course.

    In general though, you might want to be a bit more conservative. Marmox do a whole load of XPS panels intended for insulating bathrooms, among other things. Bushboard do an XPS decorative panel for the surface, if that sort of thing appeals - we like them.
    adam_w, I am not being picky, but that's the Lambda value, not the U value. It's quite OK, though - better than wood-fibre. XPS is completely vapour-closed.

    Delprado, You can use wood-fibre if it is not going to get wet, and if it is not going to fully tiled (and rendered impermeable).

    Your potential wood-fibre supplier should be able to advise. I always run my bathroom plans past my supplier and take their recommendation.
    • CommentAuthortony
    • CommentTimeFeb 22nd 2018
    When you say insulate, what U value are you aiming at for the wall?
    • CommentTimeFeb 22nd 2018
    Posted By: Nick ParsonsIt's quite OK, though

    It's certainly better than any other claim I've ever seen for XPS :devil:
    Is this retrofit and are you using a vapour-tight layer on the inside (as many but not all recommend for retrofit IWI)? If so then you can put whatever insulation you like outside of that.

    For what its worth, we used aquapanel (printed plastic coated ply) as the decorative and waterproof layer, then PIR insulation, then a ventilated gap over existing stone wall. Floor is glazed tiles over Marmox insulation board over existing cement floor.
    ''It's certainly better than any other claim I've ever seen for XPS :devil:''

    Yes, I have never seen better than 0.030, but then I remember old XPS.....:bigsmile:
    I just used PB pre stuck to XPS, tiled the bits that get water droplets on them (toilet, shower, sink backsplash) and I have MVHR. I stuck them to the wall with squirt foam and very few fittings. This IWI on a solid ultra porous stone wall, capillary open cement rendered externally with good masonry paint.
    30 years ago I tiled directly to XPS (no pl'bd). About 10+ years ago I moved the room around, and again stuck tiles to XPS. Hanging on nicely.
    • CommentAuthorKenny_M
    • CommentTimeApr 30th 2018
    Delprado, just wondering what you did in the end?

    Bathroom currently being ripped out in my own house at the moment, some of the old lath and plaster will have to come off where it is pulling off in chunks with the tiles and I am thinking about just pulling it all off from the external walls and insulating from the stone wall in. I'm a bit torn between using something impermeable to stop moisture getting through, and with keeping it vapour permeable. That bathroom was not well ventilated before we got here and most of the lime based plaster is still in very good condition despite being in a damp environment for ? however many years since a bathroom was added there which is at least 30 years and probably a lot longer.
    • CommentAuthorgyrogear
    • CommentTimeApr 30th 2018 edited
    Posted By: Nick Parsons30 years ago I tiled directly to XPS (no pl'bd). About 10+ years ago I moved the room around, and again stuck tiles to XPS. Hanging on nicely.

    I'm on the verge of doing the same thing... I know it's a long shot but can you remember what type of *tile* adhesive you used by any chance ?

    (I am tempted to use the same adhesive for the tiles as I'm using for the XPS).

    Bog-standard nothing-special tile adhesive.
    • CommentAuthorgyrogear
    • CommentTimeMay 1st 2018
    Thanks, I'll keep you pasted !

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