On 22/05/2019 13:29, 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.

The stone resin ones normally suggest bedding onto a wetish mortar mix.

I normally mix up the mortar with some SBR as an add mixture. Trowel it
onto the base, and get it approximately level at about 1/2" thick. Lay a
couple of bits of plastic pipe across the mix, and drop the tray onto
that. Slide into final position and then pull the pipes out to drop the
tray in place (its easy to do heavy trays with access from only the
front this way).

Put a level on it and tap level with a rubber hammer, then leave to set
having made sure the drain hole is clear and unobstructed and ready for
connection.


--
Cheers,

John.

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