I'm going to be fitting a B&Q "stone" rectangular shower tray soon -
what mortar mix and thickness should I use?
When I've installed shower bases before I've used silicone with one and
mortar with the other - the silicone was much easier but this time the
tray comes with instructions that say to use mortar and not to use
Read the installation instructions and follow them to the letter,
otherwise the slightest deviation will invalidat any warranty.
Silicone is by far the easiest but if instuctions say morter then
morter it must be and not one millimeter more or one millimetre
I put one of those trays in a few years back using a dry mortar mix. I took
advice from the manufacturers who reiterated the need for a dry mix. The o
nly advice on thickness was use whatever it needs to produce a flat and plu
mb bed. The thickness I ended up with was about 12mm to 20mm due to the flo
or running away to one end. Under 12mm and you will find it hard to keep th
e dry mix as on contagious mass.
I did this job way back in 1998 and I believe that I used a 1:4 cement and
sand mixed semi-dry and spread at an even thickness of around 15-20 mm. No
addtives were used and the mix was wet enough to hold together when squeezed
lightly in the hand with the base placed on the surface of the mix and
lightly 'jiggled' to ensure an even contact.
Note that the bottom of my shower base has an inbuilt fall to the outlet and
to maintain this, the mix was laid level as was the top edge of the shower
To ease the levelling up of an uneven timber floor, I cut a piece of good
quality WBP 20 mm plywood the size of the base and laid it on top of the
floor and bedded the shower base on this - and used the edge of the plywood
as a fixing for the timber skirting that went around the base.
Hope this is of some help
On 02/03/2014 20:44, Biggles@flies_undone.com wrote:
Thanks folks. I used 4:1 with a bit of plasticiser that was left over
from an earlier job. It was slightly wetter than I would have liked (due
to me not realising how wet the sand was) and ended-up about 15mm thick.
When I did this a long time ago I used sharp sand and found it difficult
to bed, with soft sand it was much easier.
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