Hot Water Under Floor Heating On A Sand Cement Screed

[DHTiling]

And it will still happen....but hopefully we can show some the errors of there ways so to speak......keep it up mate...

 

[Leatherface]

As far as I know the advice is allow one day per mm of screed for drying out again dependant upon conditions. Please correct me if I am wrong

 

[DHTiling]

its about that..but the average screed is 30 days or so..but there are products that can be used to tile onto screeds as soon as they can be walked on..Like ditra mat.. it is a vapour equalising membrane and great for fastrack installations...and bal do a green-screed adhesive..........

 

[White Room]

As far as I know the advice is allow one day per mm of screed for drying out again dependant upon conditions. Please correct me if I am wrong

Same as, but no nobody wants to wait that long, with solid plastering you would have to wait 6 weeks, could'nt do that now

 

[Leatherface]

Yes I was using Ditra Matting on a job in Cheltenham last week - didn't know it was suitable for underfloor heating though ?
Bal Green Screed adhesive is extortionate in price.
Also if you are able to have an input into the screeding process, which is usually unlikely, some manufacturers do a Fasttrack screed that can be tiled onto in a week or so - Mapei are one such supplier

 

[DHTiling]

Yep.. ditra is great for UFH.....because it isolates the two surfaces thus less chance of debonding due to expansion.....

 

[Leatherface]

Not over keen on the stuff though - hate filling all the holes up

 

[White Room]

Adhesive, ditra, adhesive and then tiles. It'll cost a fortune in heating a floor, cheaper to get a pair of slippers:lol:

 

[Fekin]

Interesting thread

All these soft buggers with ufh.. whats wrong with goold old slippers :lol:

 

[lm tiles]

Thanks for all the help guys ..I have only tiled on top of electric at heating so thought i had better ask as i keep saying this site is worth its weight in gold anyone who does'nt ask ,does'nt learn . I think this lady thinks i'm trying to put the job off till after Christmas i'll show her a print off of these answers and that should at least back me up .

 

[GazTech]

Thanks for all the help guys ..I have only tiled on top of electric at heating so thought i had better ask as i keep saying this site is worth its weight in gold anyone who does'nt ask ,does'nt learn . I think this lady thinks i'm trying to put the job off till after Christmas i'll show her a print off of these answers and that should at least back me up .

good thinking mate

 

[Dan]

Just bumping some threads in the underfloor heating forum. You can now find and search for both electric underfloor heating and water underfloor heating threads. By the way, if you feel some of the threads you want to be seen at the top of the forum need to be bumped back, for the next month or so from now, feel free to do that. Although it's not usually something we allow, whilst we're going through this process of changing over forum software, we see the need for this to happen.

 

[macten]

its about that..but the average screed is 30 days or so..but there are products that can be used to tile onto screeds as soon as they can be walked on..Like ditra mat.. it is a vapour equalising membrane and great for fastrack installations...and bal do a green-screed adhesive..........

Would mapetex also be fine? Also if you are using a product to fastrack tile installation over wet UFH how does that work when the ufh needs commissioning prior to tiling? Does the screed not have to still dry out naturally prior to commissioning or does a membrane mean you can commission earlier?

 

[One Day]

Would mapetex also be fine? Also if you are using a product to fastrack tile installation over wet UFH how does that work when the ufh needs commissioning prior to tiling? Does the screed not have to still dry out naturally prior to commissioning or does a membrane mean you can commission earlier?

very old thread but seeing as you asked.... I believe only ditra is suitable for use over uncommissioned ufh. others require commissioned floors. Ditra is hands down the best uncoupling membrane there is. Everything else is a lesser copy at best or repackaged roofing membrane at worst.

 

[Old Mod]

Would mapetex also be fine? Also if you are using a product to fastrack tile installation over wet UFH how does that work when the ufh needs commissioning prior to tiling? Does the screed not have to still dry out naturally prior to commissioning or does a membrane mean you can commission earlier?

I believe you can turn UFH on after 3 weeks Nick,
And if I'm wrong, hopefully someone will correct me.