Minimum tile spacing for floor tiles over underfloor heating

[slanty]

Hi All,

This is my first post so I hope I have posted in the correct forum.

I'm wondering what is the minimum tile spacing I should use for floor tiles I am laying?

The tiles are 45cmx45cm and are being laid over electric underfloor heating (Devimat 150W/sqm). I have laid f-board 6mm insulation with weber rapid set tile adhesive (one suitable for underfloor heating but I can't remenber the name) over the concrete base, then laid the heating mat and applied a layer of Arc self levelling compound mixed with latex liquid to secure the heating element. I will be using the same Weber rapid set tile tile adhesive for the tiles.

I want to have the minimum suitable spacing between the tiles because I think that will look best with the bathroom design we want. I was hoping to use 3mm spacers but will this be ok with that size of tile and the underfloor heating?

Thanks in advance for any help given,

Slanty

 

[steve187]

yes 3mm should be fine, and welcome to the forum

 

[jpservices]

welcome to the forum (says me have not been on for a few months) always great help and info here 🙂. I have used 2/3/4 mm spacers and all been fine. only advice i will say is really push the grout into the spaces as with heated floor there is alot more expansion an contraction to deal with...

 

[AliGage]

Hi and Welcome to tilersforums.com.

3mm is British Standards minimum grout joint width for floors, i wouldn't be putting any smaller joints in than that, certainly not with UFH as well.

 

[slanty]

Thanks all for the responses and welcomes, great to know that 3mm will be ok

 

[nybor62]

yep 3 mm for me

 

[White Room]

Hi and welcome.....