Grout & Underfloor Heating

[Argyll Eagle]

Is it risky to use floor tile grout (Porcelanosa's Butech) without flexible additive where the tiles are laid on top of underfloor heating? The flexible additive is more expensive than the grout, which I have already bought, so difficult to change to saya Bal flexible grout at this stage. I have used flexible addhesive when laying the tiles.

Anyone's experience with this subject welcome.

 

[Dan]

I wouldn't chance it. Your grout could be too firm and crack which can after time follow through to the tile too. I'd get the additive or buy a new bag of flexi-grout. After the floor has had so much spent on it, is it right to save a few quid on the grout?

 

[laurami tiling]

i agree with dan if you are using a flexi addy always use a flexi wide joint grout.
i always use a wide joint grout on all jobs anyway

tony

 

[DHTiling]

you will have to use an additive with your grout as if you use a standard grout it will just crack with any expansion created by the UFH and as the substrate expands at different rates to the tiled surface it must be modified grout you use.... dave....

 

[Argyll Eagle]

Many thanks Dave.

 

[GazTech]

you will have to use an additive with your grout as if you use a standard grout it will just crack with any expansion created by the UFH and as the substrate expands at different rates to the tiled surface it must be modified grout you use.... dave....

what a pro !