I've been on a site where nor only the builder instructed another tiler to use 1mm joints in planks over UFH. But it was grouted in Mapei Maron and looked awful!
I use grey 99% of the time too but have a look @marten as I have a 13sqm plank floor to do in a conservatory coming up soon.
I use grey 99% of the time too but have a look @marten as I have a 13sqm plank floor to do in a conservatory coming up soon.