travertine floor tiling ufh

[morgan4367]

hi
Ive been asked to lay travertine floor tiles onto ufh matt, which is being layed on insulating boards over a screeded floor.Do i use a 1part flexible adhesive or a 2 part flexible adhesive.
Tony

 

[Gazzer]

A single part adhesive is what you need . When working with travertine i reccomend an uncoupling membrane. Belt and braces and all that

 

[grumpygrouter]

I agree with Neale. Deffo need a decoupling membrane.

 

[morgan4367]

Thanks guys
Do you still need it even though im tiling over insulating boards,if yes i presume it goes over the ufh matt.

 

[lcjohno]

Do you have to use a decoupling membrane on a job like that? if so why? Sorry if i sound thick but i thought you just used decoupling membrane when tiling over different surfaces or tiling into a new extension from existing building. Just interested to know.

 

[Gazzer]

NO, you dont have to use it. As i said its belt and braces. Adhesive manufacurers will tell you its not needed .
I personally wont use Travertine over UFH without it though.

 

[lcjohno]

Is it because theres alot of expansion and movement in travertine with ufh?

 

[DHTiling]

It is because travertine is a softer stone than some others and it will crack with stress....UFH will create thermal expansion and to help create a long lastng installation i too advise my customers to use an un-coupling membrane..

But it is not a necessity for tiling with travertine and UFH.. i class it as a prevention..

 

[Thespanishtiler]

Dave

i am doing a wet room the week after next. trav walls and floors. its a stable t and g floor with no deflection.

i had specified ci over the t and g then spf.

the customer has now requested ufh so i have specified 6mm marmox with ufh in slc then spf the floor is 5600mm x 1600mm, with a 5m2 matt at 100w/m2

i had not considered the ci with the ufh untill this thread got me thinking what do you reckon ?

i have done plenty of stone installs over timber with ci and plenty of stone installs with ufh over wedi/marmox but never the two together

Spanish

 

[DHTiling]

Th Ci matt can actually make the heat tranfer more efficent, as the heat travels through the channels in the Ci matt..creating less chance of cold spots..

I use it all the time if the customer is ok and after explaining the benefits of using it..plus the un-coupling works better on top of the UFH and not the other way around.