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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorjfb
    • CommentTimeSep 5th 2014
     
    I am building a shower enclosure with 2 sides aquaboard/tiles and the third is the original stone/brick wall.
    I have already put a leveling render coat of lime/sand (using it everywhere else) and was planning on tiling directly onto that.

    Should I pva the render before tiling? (read elsewhere that tile adhesive might not get on with PVA). Or maybe use some other tanking material? Or just tile directly on to the render? Would I have been better using a non lime render mix? I guess i could get another sheet of aquaboard but it is not cheap and I lose another 12mm!

    Any advice gratefully received!
    • CommentAuthorowlman
    • CommentTimeSep 5th 2014 edited
     
    You can get tile backer boards at 4mm thick. Alternatively/as well, look at Dukkaboard Aqua 77 range of products, - fleece, primers etc. pay particular attention to corners and junctions.
    Given half a chance water WILL eventually penetrate grout lines, do the waterproofing under the tile surface first.
  1.  
    If you tile directly onto the brick, it will inevitably get wet as it is impossible to make tile grout impervious (unless you use epoxy, and even then it's not foolproof). PVA will not help you here as it is not 100% waterproof.

    You could use a paintable waterproof layer like RedGard ( http://www.custombuildingproducts.com/products/surface-preparation/membranes-underlayments/redgard.aspx ). Not sure if this product is available in the UK. Alternatively, use a waterproofing layer like Schluter Kerdi http://www.schluter.com/8_1_kerdi.aspx

    Paul in Montreal.
    • CommentAuthortony
    • CommentTimeSep 5th 2014
     
    I would go for a sheet over the render, ideally the same as the other two sides. with fail safe joins to whatever is below, ie sheet in front of or over the upstand lip.
    • CommentAuthorCWatters
    • CommentTimeSep 6th 2014
     
    Never use ordinary PVA as a primer where water might get at it. It is very likely to soften. BAL and others do proper primers for the job.

    I agree with what others have said - ideally put aquaboard on that wall as well.
    • CommentAuthorjfb
    • CommentTimeSep 6th 2014
     
    ok - i accept the advice!

    how would you fix the aquaboard to the lime render? stainless screws? just adhesive on the back - if so what?

    cheers
    • CommentAuthorowlman
    • CommentTimeSep 6th 2014
     
    That depends on which type of backer board you use. Some like Marmox are extruded polystyrene with fibreglass coatings, and need a combination of adhesive and mechanical fixings. Others like Hardibacker are cementious rigid boards and may require a different treatment. What do your Aquaboard instructions say?
    Personally I'd be tempted to use a combination of adhesive and mechanical wherever instructions just state adhesive, but then that's just me, and a few dozen screws are cheap.
  2.  
    These boards are very expensive. I use Mapelastic, tile directly onto it, remains slightly flexible, very quick to apply and sticks to anything, forever. Belt and braces put some mesh into first coat on angles and corners - very easy for DIYer as is almost impossible to fail - but you can get messy the first time!
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