Large shower tray (1420x900x70) to fit. The documentation states it should
be bedded on 5:1 mortar ensuring the base and walls fully supported. This
is about 130kg of mortar (if it was a solid lump).
Google searches have pulled up shower trays with adjustable feet or trays
bedded on thin screeds and none about mortar beds 50mm+ thick.
Are there any pitfalls in this volume of mortar with chipboard floor and the
fiberglass on the remaining surfaces? Any views/recommendations/tips e.g.
lay polythene membrane over the chipboard, an off the wall suggestion "put
the mortar in aluminium take away trays - crush down and easily placed"
Even sliding into place on removable battens is going to be a problem with 3
walls in situ and a mortar bed going from say 5mm at edges to around 50mm
over the rest. If the top surface of the shower tray is 20mm thick would it
be reasonable to assume that voids left by 3*2's pulled out after sliding
the tray in on them would be insignificant (or in fact I'll need them to
allow levelling of the tray) ?
Seems a pretty thick layer... when I did mine I followed the
instructions and am pretty sure it was not as deep as that. But I IIRC
the bottom of the outer rim of my shower tray was level with the bottom
of the main area of the tray so there was no disparity in the depth of
the mortar - it was definitely uniform throughout, whereas it sounds
like yours isn't?. Think the battens I used were something like 1.5" x
1", stood on edge, so the voids left when removing them were pretty trivial.
It was a SHMBO purchase on offer in a shed. Best described as a "sink &
drainer" tray. Just checked the supplied waste fitting and it looks like
its centre lines up with the middle of the floor. I'm now very tempted to
take 30mm off the skirt all round to avoid to 2 bends in first foot of waste
How do you summise a 50mm+ bed of mortar. The mortar does not have to go up
inside the void between the tray walls and tray sides, I think that is where
your thinking is coming from, only the underneath of the tray base and the
wall bottoms need to be supported. I have installed dozens of these things
and always bed them on approx 1/2" thick. I use 1/2" square timber and
space these out so I can 'float' the motar to a constant thickness and the
after the tray is in slide the battens out. It can be tricky getting the
tray into a three sided alcove but it can be done, with a helper if the tray
is as big as yours!
Cross section of a typical tray
/ _tray_ |
/ / X | |
---------/ / XX | |
----------/ XXXX | |
YYYYYYYYYY | |
XXX area doesn't need mortar
YYY area does
Hope that turns out OK after posting.
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