Hi,

I'm going to install a new quadrant shower tray (900x900mm)
in our re-fitted ensuite bathroom. Being made of stone resin
(acrylic coated) tray is ***king heavy and is going down on
standard t&g floorboards (upstairs room).

Instructions say to lay it down on a sheet of marine ply and bed
onto a sand/cement mix. Presumably this is to insure a firm and
even base. Anyone any experience of doing this? How thick
would the ply have to be, and what ratio of sand/cement should
I use? Would this be sufficient to hold it in place?

Any advice greatly appreciated.

Thanks,

David

Instructions say to lay it down on a sheet of marine ply and bed
onto a sand/cement mix. Presumably this is to insure a firm and
even base. Anyone any experience of doing this? How thick
would the ply have to be, and what ratio of sand/cement should
I use? Would this be sufficient to hold it in place?

I used 18mm ply and a bag of dry mix bricklaying mortar. I also used WBP
ply. Marine ply is extraordinarily expensive and WBP is almost as good.

Christian.

I have got really heavy marble slate tiles on the floor and walls. Each
tile is about 60cm x 30cm and 1cm thick and must weigh 20kg and there are
dozens of them. This lot must weigh a tonne at least. I bought the house
with the en suite and bathroom done like this and have the receipts from the
previous owener of the house that it cost near on £25 grand to have done. I
was worried by the weight of this stuff upstairs but there are no cracks or
anything in the downstairs ceilings. It's been like this for two years so
I'll keep you posted !!

Steve


"david kerr" wrote in message
...
Hi,

I'm going to install a new quadrant shower tray (900x900mm)
in our re-fitted ensuite bathroom. Being made of stone resin
(acrylic coated) tray is ***king heavy and is going down on
standard t&g floorboards (upstairs room).

Instructions say to lay it down on a sheet of marine ply and bed
onto a sand/cement mix. Presumably this is to insure a firm and
even base. Anyone any experience of doing this? How thick
would the ply have to be, and what ratio of sand/cement should
I use? Would this be sufficient to hold it in place?

Any advice greatly appreciated.

Thanks,

David

I have got really heavy marble slate tiles on the floor and walls. Each
tile is about 60cm x 30cm and 1cm thick and must weigh 20kg and there are
dozens of them. This lot must weigh a tonne at least. I bought the house
with the en suite and bathroom done like this and have the receipts from
the previous owener of the house that it cost near on £25 grand to have
done. I was worried by the weight of this stuff upstairs but there are no
cracks or anything in the downstairs ceilings. It's been like this for two
years so I'll keep you posted !!

Don't worry about it. The size of the tiles doesn't matter, only the
thickness and most bathrooms these days have a good 1cm of stone or ceramic
cladding their every surface. A tonne really isn't that much to a well built
house, especially spread out on largely load bearing walls.

Christian.

david kerr wrote:
Hi,

I'm going to install a new quadrant shower tray (900x900mm)
in our re-fitted ensuite bathroom. Being made of stone resin
(acrylic coated) tray is ***king heavy and is going down on
standard t&g floorboards (upstairs room).

Instructions say to lay it down on a sheet of marine ply and bed
onto a sand/cement mix. Presumably this is to insure a firm and
even base. Anyone any experience of doing this? How thick
would the ply have to be, and what ratio of sand/cement should
I use? Would this be sufficient to hold it in place?

Any advice greatly appreciated.

Thanks,

David

David,

I did a similar job a few years ago and the method I used was thus:

1 Laid, levelled and screwed a piece of 20mm (3/4") WBP plywood onto the
floor the size of the base.

2 Cut three strips of 25mm x 13mm (1" x 1/2") ply wider than the newly
laid board and laid them one close to each end and on in the centre on top
of the same (adjust the quantity and spacing to suit your job as needed).

3 Mixed a dry mix of sand and cement to the following ratio 3 sand, 1
cement with just enough water to bind it when squeezed in the hand.

4 Laid and levelled the above between the pieces of previously cut strips
of plywood and used these to 'screed' to level a finish to the sand/cement
mix - and then left them insitu for the following operation.

5 Place the shower base gently on top of the sand/cement and plywood
strips, adjust the base to where it has to go, gently remove the ply strips
by pulling them out one at a time, give the shower base a little twist
back-and-fore to settle it in place and then leave the sand/cement to set.
Don't bother trying to fill the gaps left by the strips as they will not
affect the strength of the work.

Remember, that this base has virtuall no adhesion and it will be possible to
move the shower base if it is carelessly handled or kicked after the compo
base has set and before tiling or joint sealing.

Hope this is of some help?

Brian G

Christian McArdle wrote:
Instructions say to lay it down on a sheet of marine ply and bed
onto a sand/cement mix. Presumably this is to insure a firm and
even base. Anyone any experience of doing this? How thick
would the ply have to be, and what ratio of sand/cement should
I use? Would this be sufficient to hold it in place?

I used 18mm ply and a bag of dry mix bricklaying mortar. I also used WBP
ply. Marine ply is extraordinarily expensive and WBP is almost as good.

Christian.

Thanks for this, will go for WBP.

BTW, what does WBP stand for? Waterproof B(?) Ply?

Cheers,

David

"David" wrote in message
oups.com...

BTW, what does WBP stand for? Waterproof B(?) Ply?


Wataer & Boil Proof I believe.

HTH

John

We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "David"
saying something like:

BTW, what does WBP stand for? Waterproof B(?) Ply?

Water and Boil Proof.

Quite why anybody would want to squeeze their boils on to it, I do not
know.
--

Dave

Thanks for this, will go for WBP.

BTW, what does WBP stand for? Waterproof B(?) Ply?

Water and Boil proof (but don't you all go boiling it up now !!)

Nick

Water and Boil proof (but don't you all go boiling it up now !!)

AIUI, the boiling actually refers to localised boil spots that occur when
damp plywood is in direct sunlight. Non WBP ply can't resist such spots,
causing delamination. I may be wrong, but that was my understanding.

Christian.

"Christian McArdle" wrote in message
...
Water and Boil proof (but don't you all go boiling it up now !!)

AIUI, the boiling actually refers to localised boil spots that occur when
damp plywood is in direct sunlight. Non WBP ply can't resist such spots,
causing delamination. I may be wrong, but that was my understanding.

Christian.


Hi Christian,

Thanks for that snippet ! I really couldn't think of why it might be a
useful feature..

Good question for a pub quiz!

Nick

AIUI, the boiling actually refers to localised boil spots that occur when
damp plywood is in direct sunlight. Non WBP ply can't resist such spots,
causing delamination. I may be wrong, but that was my understanding.

Thanks for that snippet ! I really couldn't think of why it might be a
useful feature..

Good question for a pub quiz!

Check it first, though.

Christian.