tiling on ply

[kevin67]

got a job coming up where the floorboards have been lifted and 22mm ply laid over the joists with water ufh beneath. the customer is going for 600x600 porcs. whats the best addy for this, i would normally use bal ptb for this, would this be ok? i've never tiled straight on to ply with ufh

cheers

[timeless john]

Check that there is no deflection.
Consider using a decoupling membrane.
Fast set flexible adhesive.
Look at other threads reference 600x600mm porcelain/supplier/issues.

Have fun.

[kevin67]

cheers timelessjohn

is the decoupling membrane absolutely necessay for porcs? i've never used that either

cheers

[Stewart]

I would always recommend using one with heated floors....

[kevin67]

cheers stewart, do you just stick it down with flexi addy?

[Stewart]

Yes..... Single part flexible.

[aph257]

I would always recommend using one with heated floors....

defo..

[TF Ed]

hi kev

spf adhesive and make sure that floor is solid before tiling ie no deflection, suitable fixed/screwed etc
as above regarding using a decoupling membrane when tiling over a ufh, especially on ply.

heres a little vid clip thats been posted before..

it shows..
why you use a decoupling membrane
what substrate conditions it should be used on
and finally a demo of an installation. ie tips, adhesive and trowel etc

there are other brands such as dural and genesis, but this will give you a good basis to work from.



cheers
ed

[Fusion Tiling]

Good video, it looks straight forward.

Thanks for the info, it will come useful in time.

[Alberta Stone]

I always prime my plywood before tiling.
I use primer L diluted and yes, it is recommended for concrete, but it works well for plywood also and far cheaper than the other primer they make for wood.
Primer L soaks into the wood veneer and gives it great integrity.
I let it dry out before tiling it.
And for heated floors I always use ditra just to be safe.

[TF Ed]

hi alberta
most companies in the uk state, 'prime the rear of the board and sides but not the face side were being tiled but i cant understand why, as surely it creates a better/controlled bond....beats me??

[Alberta Stone]

That is strange.
I use PL premium and screws to bond the ply to the primary and the PL sticks so well that there is no need for priming (it is polyurethane based and sticks to wood tenaciously)....I use 1 large tube per sheet (approx).
I then use a 50/50 mix of the primer L from Mapei and pour it directly on the floor and spread with a roller.
This I let dry and it makes the top layer of veneer have a really good tight surface which flexible thinset bonds really well to. It keeps it from drying too fast and so your adjustment time is extended a wee bit.
I prime drywall with it as well.

[Scott]

Great post Ed

I have only primed when manufacturers specs it, Ultra spec it on their stuff by the way and it does seem to go down better than other manufactureres, seems more 'sticky' with a primer

[kevin67]

update on this job, the customer has changed to 600x400 travs, is it still the same procedure for the ufh, decoupling then tile

cheers

[kilty55]

definately for stone

[kevin67]

cheers mate 1st time ill be using decoupling, want to make it right

cheers