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Do I need to prime my plastic shower tray??

Discussion in 'Plumbing and Central Heating' started by rkidday, 17 Nov 2015.

  1. rkidday


    13 Feb 2014
    Thanks Received:
    United Kingdom
    These are the bedding instructions for the GRP shower tray I am installing (it looks like the GRP is moulded around a plastic base)

    'Install the shower tray on a 15mm depth of weak cement

    mix (sand/cement ratio 5:1). Tile adhesive can be used as
    an alternate to sand or cement.
    Please note if using water based adhesives, to enhance the
    bonding it is suggested that a suitable primer is applied to
    the base of the shower tray before installation.'

    I plan to fit the tray using tile adhesive on top of boarding primed with an acrylic primer.

    My questions:
    • Can anyone recommend a good tile adhesive for this job (preferably non water based so that primer is not required)? - I've got a tube of Wickes waterproof wall adhesive handy but I assume this is water based.
    • What type of primer should be applied to the base of the shower tray if using a water based tile adhesive?
    • Can I get away with less than 15mm using tile adhesive as the tray is wider than the recess and therefore I've chased into the block work (so have limited adjustment). Also to get the required drop the tray is already quite high and I'd like to minimise this (I can't change the plinth height now) - see pictures.

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  3. dilalio


    20 Mar 2009
    Thanks Received:
    Potters Bar
    United Kingdom
    Stick it down with silicone!
    It ain't going anywhere (y)
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