On Wed, 22 May 2019 05:29:33 -0700 (PDT), Lee Nowell
wrote:

Hi

We have bought a low profile solid shower tray. The bottom is completely flat. Our other one had ridges and I installed successfully using mastic to stick it to the flat ply floor.

I used the same technique on this one but think that because the bottom is flat the mastic wouldn't spread evenly and net result was some give in the tray. I have now lifted it up again and wonder what the best option is to fit it?

One option might be to put many thin beads of mastic with spacing to help the spread but wonder if I will get the same issue. The manufacturer has an alternative of putting sand and cement on top of the ply and fit the tray on top (unclear whether this is a dry or wet mix and what thickness)

Any advice appreciated.


My shower was installed on a bed of tile adhesive, which the fitter
used because it was to hand. It's been in around 15 years now, with no
sign of any movement or deterioration.