extruded foam insulation board

[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.