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