extruded foam insulation board - Tile Advice

The Legend; Phil Hobson RIP · May 17, 2015

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 · May 17, 2015

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

Just Rizzle · May 17, 2015

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 · May 17, 2015

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 · May 17, 2015

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

Rookery · May 17, 2015

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 · May 17, 2015

Sean SML Tiling said:
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 · May 18, 2015

urghhhhhh, dont like this stuff.

Uheat - Keith · May 18, 2015

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 · May 18, 2015

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 · May 18, 2015

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 · May 20, 2015

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

Dan · May 22, 2015

Did you tile over it @Phil Hobson ?

Sean Kelly · May 23, 2015

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 · May 24, 2015

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.

extruded foam insulation board - Tile Advice

The Legend; Phil Hobson RIP

Dave

TF

Just Rizzle

J Sid

Sean SML Tiling

Rookery

J Sid

Lee@emctiles

TF

Uheat - Keith

Diamond Pool Finishers

TF

Dan

Admin

gamma38

TF

Dan

Admin

Sean Kelly

TF

Dan

Admin

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