Hot Water Under Floor Heating On A Sand Cement Screed - Tile Advice

[lm tiles]

Any advice on tiling onto a sand cement screed laid over underfloor heating pipes . I would imagine the screed will be pretty weak not like a concrete floor . Ceramic tiles ..

 

[DHTiling]

If the screed is laid right then it won't be weak....use flexi products to tile with...Also a product like ditra mat is ideal for this type of installation.........

 

[lm tiles]

Thanks for getting back as quick . would you advise sbr bonding first

 

[DHTiling]

Most definitely...........:hurray:

 

[lm tiles]

will do m8 .its great to have a back up like this site . does wonders for your confidence .

 

[enduro]

A plumber mate of mine when they have laid this type of heating turn the heating on for a couple of days as hot as it will go then let the floor go cold before i tile, dont know if this helps to stop to much expansion.

 

[Perry]

this may help Pete

http://www.pci-uk.com/PCIUK/En/tilingadvice/howtoguides/tilingontounderfloorheating.htm

 

[GazTech]

this may help Pete

http://www.pci-uk.com/PCIUK/En/tilingadvice/howtoguides/tilingontounderfloorheating.htm

nice one pj...the bit about heating gradually was spot on !:hurray:

 

[Perry]

Had one turn the heating on to 30 deg while still tilling on limestone nice one
:furious3: :mad2:

 

[GazTech]

Had one turn the heating on to 30 deg while still tilling on limestone nice one
:furious3: :mad2:

Dear me ..how considerate...did you revert to mixing rapid by the cup full....lol

 

[Perry]

one of those clever guys who know everything :furious3:

 

[Leatherface]

Guys - to do the job properly - first the screed should be allowed to dry out naturally - dependant upon conditions. Once dry the underfloor heating should be switched on and gradually brought up to maximum operating temperature - . Leave on once max temp has been reached for a couple of days , then allow to cool down prior to tiling. The reason for switching the heating on first is to allow for any initial expansion and cracking of the screed due to the heat.
Once tiles have been fixed again leave heating off for a couple of weeks, then again heating should be switched on and gradually brought up to maximum temp again.
Sounds a drawn out process, but a safe one. This is what I always advise and have never had any tiles crack or lift.

 

[DHTiling]

Spot on advise......works every time.........

 

[White Room]

If I was laying screed on under floor heating, It be would ready mixed with fibres mixed in for strength and leave to cure, never seen covering over screed, but 60mm have even layed 75mm,and your'll need more than a couple weeks. No heating until screed has cured notch up slowly, otherwise cracking will happen. They say concrete reaches its maximum strength after 30 years

 

[Leatherface]

Cheers Dave - will try to be as helpful as I can, where I can. Fair play ti IM Tiles for asking - have seen a few jobs done where tilers have not asked and carried on regardless with disasterous and costly results