What size spacer for tiles on UFH

[STEVO]

Doing a job this week with a colleague, 600x300 rectified porcs over UFH. Someone mentioned to him that minimum spacer size is 3mm for this install? Is that correct? I had a quick read through the Brit Standards link someone posted on here the other day, but couldnt see any mention of this. We often use 2 or 3mm.
Any one know the answer? cheers.

 

[Ian]

2mm minimum for walls, 3mm minimum for floors (recommended).

 

[STEVO]

Thanks Bri,
have a good week. Oh no its monday again tomorrow!

 

[High Peak Tiling]

Thanks Bri,
have a good week. Oh no its monday again tomorrow!

Back on it mate, have a good one

 

[Dougs Third Go]

I normally go with 4mm when ufh is present.

 

[Qwerty]

I normally go with 4mm when ufh is present.

I agree. Always try for 4mm where UFH present

 

[DHTiling]

3mm is fine with ufh as well ,make sure perimeter joints are present.

 

[White Room]

Have seen 1mm joints on marble with ufh :yikes:

 

[Rookery]

I almost always put 3mm joints in floor, heated or otherwise. I was always under the impression that the BS minimum on wall tiling was 1mm.