I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal
it with.

TIA,

--
Paul Giverin

British Jet Engine Website http://www.britjet.co.uk

Paul Giverin wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal
it with.


PVA, 1:3 in water.


--
Grunff

Why use plywood (unless cost is your issue)
I am no expert - but I was informed, and used very well indeed,
concrete backerboard and screwed that to the floor. Bought from topps
tiles. I actually needed some for shower walls so buying a load wasn't
an issue.

If you are using ply - assume you will use marine grade if its in a
shower area

Grunff wrote:

Paul Giverin wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal
it with.


PVA, 1:3 in water.


--
Grunff

wrote:
Why use plywood (unless cost is your issue)

Why not? Plywood makes a great surface to tile onto.


If you are using ply - assume you will use marine grade if its in a
shower area

This is nonsense. Most people who go around recommending 'marine grade
ply' have never even seen a sheet of the stuff, or know what it is.
Exterior grade ply is all that is required. It is readily available, and
very cheap.


--
Grunff

In message , Grunff
writes
Paul Giverin wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got
some 12mm plywood sheet to glue and screw onto the chipboard for a
better base. I know the plywood has to be sealed but I'm not sure what
to seal it with.


PVA, 1:3 in water.


Actually, I've just read the instructions on the tiling adhesive (BAL
Fastflex) and it says that its the underside and edges of the plywood
that needs to be sealed and not the face that the tiles are laid on.

--
Paul Giverin

British Jet Engine Website http://www.britjet.co.uk

Paul Giverin wrote:

PVA, 1:3 in water.


Actually, I've just read the instructions on the tiling adhesive (BAL
Fastflex) and it says that its the underside and edges of the plywood
that needs to be sealed and not the face that the tiles are laid on.


I seal any ply as a matter of course before tiling. Makes the adhesive
stick better.


--
Grunff

In message , Grunff
writes
Paul Giverin wrote:

PVA, 1:3 in water.


Actually, I've just read the instructions on the tiling adhesive (BAL
Fastflex) and it says that its the underside and edges of the plywood
that needs to be sealed and not the face that the tiles are laid on.


I seal any ply as a matter of course before tiling. Makes the adhesive
stick better.


I'm on the BAL website at the moment looking at their fixing guides.
They say about laying floor tiles onto plywood :- "The timber sheets are
of a water resistant or exterior grade. They must be dry and rigid
without protruding fixings. Seal the reverse side and edges with BAL
BOND SBR. Do not prime or seal surfaces to be tiled".

I wonder if the flexible adhesive needs to soak into the plywood?

--
Paul Giverin

British Jet Engine Website http://www.britjet.co.uk

Paul Giverin Wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal

it with.

TIA,

--
Paul Giverin

British Jet Engine Website http://www.britjet.co.uk

You will need to use a cement based powdered adhesive mixed with a
flexible admix and usually its recomended to prime the floor with the
same flexible admix. if you get your adhesive from a tile shop they
will advise you on what to use. I've recently been using Tile Depot and
they seem pretty helpfull.




--
Nick H

Paul
Whilst not wanting to go against BAL's instructions, I would always
seal the surface, and wouldnt worry about the underside of the ply or
edges. I have known people not to seal it and for the tiles to come off
after a few weeks. With tiling the important thing is suction. This is
reduced when a surface is too porous and ends up drying out the
adhesive too quickly. The only reason that I can see for BAL's advise
is that if the surface is completely waterproof (as BAL's product might
do) then the adhesive will take a long time to go off, but it will
eventually, and will acrually produce the strongest end result (I sent
a post recently about this with regards to tiling over existing wall
tiles- and incidently recomended BAL adhesive as one of the best
around). Also make sure you use a flexi grout/additative as this is
almost more important that using a flexi adhesive.
I would however just go for a dilute PVA mix (even more dilute than
1:3) adding water and stirring until you get a semi-skimmed milk
consistency.
Additionally, 12mm ply is more than is needed, most people would go for
6mm and screw every 30cm. If screwing there is no need to glue it to
the chipboard. Make sure you have plenty screws at the edges of each
board and that you dont have ply joints above the chipboard joints.
Hope this is helpful and not adding yet another opinion into the pot.
Calum Sabey
(Newark Traditional Kitchens 01556 690544)

Paul Giverin wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal
it with.

TIA,

I never did.

Works fine.

Use a thickish bed of possibly flexible cement, to avoid the inevitable
slight movement cracking the tiles off. Use a bit of PVA or other
anti-porosity agent in the grout to stop water ingress.

I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better base.
I know the plywood has to be sealed but I'm not sure what to seal it with.

I sealed with diluted PVA and then used a specialist adhesive, Ardex Flex
7001 Timber System. You're supposed to use a special primer with this
system, but my suspicion is that it is just PVA with a large markup.

The tiles haven't moved, several years later!

Christian.

Christian McArdle wrote:
I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better base.
I know the plywood has to be sealed but I'm not sure what to seal it with.

I sealed with diluted PVA and then used a specialist adhesive, Ardex Flex
7001 Timber System. You're supposed to use a special primer with this
system, but my suspicion is that it is just PVA with a large markup.

The tiles haven't moved, several years later!

Christian.


Ardex is good stuff.
Recommended. Its the pro solution.

On Sun, 12 Nov 2006 20:39:24 +0000, Grunff wrote:

wrote:
Why use plywood (unless cost is your issue)

Why not? Plywood makes a great surface to tile onto.

Why not use cement board? Won't rot from any prolonged water exposure
and is also a great surface to tile onto.

cheers,
Pete.

Pete C wrote:

Why not use cement board? Won't rot from any prolonged water exposure
and is also a great surface to tile onto.

I've never really liked the stuff - not as strong as ply, and not as
nice to cut.


--
Grunff

On 2006-11-13 09:47:05 +0000, "Christian McArdle"
said:

I've got to lay some floor tiles onto a chipboard floor. I've got some
12mm plywood sheet to glue and screw onto the chipboard for a better
base. I know the plywood has to be sealed but I'm not sure what to seal
it with.

I sealed with diluted PVA and then used a specialist adhesive, Ardex
Flex 7001 Timber System. You're supposed to use a special primer with
this system, but my suspicion is that it is just PVA with a large
markup.

The tiles haven't moved, several years later!

Christian.


Christian (or anyone)

Do you happen to know where Ardex products can be obtained locally or on-line.

Google doesn't seem to be very revealing.

Do you happen to know where Ardex products can be obtained locally or
on-line.

I found my supplier through a stockist search on the Ardex website.

Christian.

On 2006-11-20 09:31:00 +0000, "Christian McArdle"
said:

Do you happen to know where Ardex products can be obtained locally or on-line.

I found my supplier through a stockist search on the Ardex website.

Christian.

Thanks, Christian.

Where did you go?

I found my supplier through a stockist search on the Ardex website.

Where did you go?

It was a small company run from a unit on the Elgar Road trading estate
somewhere. Whether they are still there, or what they are called, I have no
idea. It was a few years ago, now.

Christian.

On 2006-11-20 10:29:01 +0000, "Christian McArdle"
said:

I found my supplier through a stockist search on the Ardex website.

Where did you go?

It was a small company run from a unit on the Elgar Road trading estate
somewhere. Whether they are still there, or what they are called, I
have no idea. It was a few years ago, now.

Christian.

OK. I'll see if I can find it; although it looks like there's one at Theale.