Advice on tiling large floor

agree with DH, but mapei reccomend adesilx vs45 to stick dierta to damp screeds.....
this stiff is a vinyl contact adhesive....its worse than epoxy grout if you get what i mean.....i personally would prefer to wait.......but dietra does cover a multitude of sins.....:yes:

[heffs]

Thanks again for all the advice.

It will not be possible to connect and run the ufh before tiling. However, I have been in touch with Schluter with this problem, and they say the ditra matting should cope with the subsequent expansion and contraction when the ufh is finally connected, provided that we raise the temperature gradually, as all of you suggested.

So I'll be laying the mat, then. Bank manager will be pleased...


Thanks again.

Heffs

[Pawelzik]

Originally Posted by protilers

as to last post by pawelzic.....i have never heard of an underfloor heating manafacturer advising that the element is on while you install.....

Hello protilers. Just want to explain that you sure couldn´t have heard of this as this is a german regulation. It is from the so called "ZDB Merkblatt Keramische Fliesen auf beheizten Fußbodenkonstruktionen", translated "Ceramic tiles on underfloor heated grounds". This regulation says, that:
- at normal climate (= temperature > 5°C) the UFH shall be off as the surroundin temperature is sufficiant,
- at cold climate (= temperature < 5°C) the UFH shall be in function but not over 15°C.

As we share the same problems and technics I think this regulation can be transferred to typical UK tile works. Hope I have explained well enough, cheers Martin.

[murf]

ditra gets my vote for this job

palz.......i understand what you are saying......but why not heat the room....not the element.........not to mention that under your knees it will be hot!!!
most adhesives work in the temps you state, but what about expansion and contraction....in may be different in germany (much,much colder) but in the u.k all underfloor manafactures reccommend that its off and not turned on for up to two weeks and the turned on gradually......5 deg,10 deg,15 deg etc. over as many days........

[pjc]

Pro Martin is a manufacturer and i think he is a chemist

[Pawelzik]

Originally Posted by protilers

most adhesives work in the temps you state, but what about expansion and contraction....in may be different in germany (much,much colder) but in the u.k all underfloor manafactures reccommend that its off and not turned on for up to two weeks and the turned on gradually......5 deg,10 deg,15 deg etc. over as many days........

Yes protilers, I absolutely agree.

My a.m. answer was refering to the fact that the screed is already 2 month old and the UFH was already in function. Sorry for being misunderstood. Cheers, Martin

[grumpygrouter]

I seem to have had a post disappear into the ether somewhere, but I will restate what I said earlier, Just for reference, for Protilers benefit, the BAL Professional Fixers Guide states that the UFH system does not need to be off before tiling if the weather is cold - and they are speaking of wet systems here, as long as the temprature is turned down below 15c. in cold weather it can be left on.

Grumpy