underfloor heating

[White Room]

Yes they insist that you use there grout,there tech said the problem they face
is that British standards say that decouple should be used on wet ufh in screed,
as ajax pointed out to me,and most tilers are reluctent to change,even though
its cheeper and much quicker to do the whole job.

We have a rule of thought and stick to it, must admit can't get my head round it not to use decoupling.

 

[philipb]

Yes i know,i was the same,it seemed too good to be true,but it was fine.
There is a run of tiles that is 20 mts long with no expansion joint!

 

[White Room]

Jeeeez 20mts...

 

[philipb]

I will defo use it again,major saving in time and money,on a job like that
not having to decouple and all the adhesive it takes,just to get on
with it is major.It was £900 just for the membrane.

 

[MRM Tiling]

Hi
I presume you are laying the matting on a screeded floor.
expansion joints at doorways is good.
check screed is laid in one go,if the screed has been laid in different stages you will need to decouple where the join is,ask the customer if uncertain.
once mat or wire has been laid it will need testing,an easy test is to wire a plug on each matting and plug into the wall socket,this is safe up to 10mins but you will only need a couple of mins to know the its all working.
now you should use a latex based self leveling compound and cover the wires.
when dry do another plug in test then you can tile using flexi

hi its onto concrete with underfloor piping running throughout. its a hallway with a room to tile just off it then up 4 steps into a kitchen/diner and through into a big living room, all concrete screed and most probably seperately done. im working with the builder who did it all in the morning so il take the info u lads have gave me and put it to him and work it out, thanks

 

[Ajax123]

No adhesive will prevent tiles and screeds from moving. You uncouple natural stone to help prevent differential movement. Unless the adhesive I made from elastic I would still uncouple.

also it sounds like the screed s no laid correctly as this should have movement joints. This leaves it prone t cracking which means an unstable screed. Fail to uncouple this and I think it will fail

 

[Mark S]

Totally agree with Ajax on this, should have joints in, and be de coupled.

 

[bugs183]

Yes they insist that you use there grout,there tech said the problem they face
is that British standards say that decouple should be used on wet ufh in screed,
as ajax pointed out to me,and most tilers are reluctent to change,even though
its cheeper and much quicker to do the whole job.

Sorry matey, but this adhesive really does sound too good to be true.
You really are better off uncoupling on u'f'h floors, be it stone or porcelain. Sometimes the time and the cost outweigh the problems that could happen.

As Ajax says (and he's the screed Guru) failure to uncouple could be costly. Would Granfix pay for the whole job to be replaced or just the cost of the adhesive?