extruded foam insulation board

[The Legend; Phil Hobson RIP]

has anyone tiled directly onto this foam backer? no cement coating, just foam with electric ufh mat?

can't say I fancy risking it.:nonod:

 

[Dave]

I did once , wasn't keen to do so but seemed to work lol...

 

[Just Rizzle]

don't think I would fancy tiling to it ether as its got nothing to make the adhesive bind to and with ufh when the addy drys out what is stoping it from debounding.

 

[J Sid]

Yes done it twice now, and its been fine.
One a conservative floor about 15m2.
The other a large kitchen floor, 38 m2 with electric underfloor heating. This one I really don't want to do. After a long phone call to the supplier I followed they instructions and all was good. Have been back to this job to do another room and the floor look perfect.
I was supplied with a primer to be used on both sides, sticking down and tiling side. They also supplied Mapei adhesive. No self leveling over wires, straight tiling on wires.

 

[Sean SML Tiling]

I may be wrong but would mapei eco prime grip stick to the foam as it sticks to pretty much everything.

 

[Rookery]

I used some uncoated insulation board once, supplied by the customer. Horrible stuff. It didn't feel as rigid as the coated stuff.

 

[J Sid]

I may be wrong but would mapei eco prime grip stick to the foam as it sticks to pretty much everything.

Wasn't eco prime I used, best talk to the foam supplier and follow there recommendations

 

[Lee@emctiles]

urghhhhhh, dont like this stuff.

 

[Uheat - Keith]

We have sold the same one for the last 9 years, over 200000 boards to date.
Make sure it is 'floor grade' insulation boards.
We always say on our quotation, "Onto a load bearing base the ..mm insulation board will need an overall extra spare depth of ..mm: ..mm board with 2mm powdered flexible tile adhesive under the boards to fix.
Flexible self-leveling compound over UFH system.
A powdered flexible tile adhesive is used to fix the floor finish."
Warm regards,

 

[Diamond Pool Finishers]

MY insulation system Aquatherm is based on this but ! i render and mash over it walls 6mm- floors 12 mm, and bond the foam boards to the sub straights

 

[Dan]

It's the same stuff marmox have inside the boards. And their cement-based adhesive sticks to it just fine. Don't worry about it. Hundreds of thousands of boards have been tiled and we've never ever had a thread on the forum posted about it failing. Ever.

 

[gamma38]

I use them, had no problems. With or without ufh,

 

[Dan]

Did you tile over it @Phil Hobson ?

 

[Sean Kelly]

I used the UHeat boards (the blue ones) on my own kitchen about 5 years ago. 18mm ply, primed, blue insulation boards, UFH, SLC, adhesive, tile. My 11 year old Daughter is stress testing the floor every day with handstands and jumping around, and my Wife skips on the floor every day...........drives me mad. I used the same boards on another bathroom installation on a friends house and he is still my friend. Both floors are fine.

 

[Dan]

Even Marmox users have to love them because when they became readily available the price of Marmox halved. Despite all the bad publicity Marmox were pushing about them, they proved they're fit for the job.