indian limestone expansion silicone joint

**macken** · 25-01-2012

hi all,
doing my first limestone job tmrow. 30m2 indian limestone 5 sizes brick effect.[ biscuit colour]
floor has water ufh with insulation on all premiter walls. 7.5 mtrs x 4.5 mtrs. no dittra being used. [i did reccomend]
stonefix white rapid flexi adh.
ardex flex fs classic vanilla grout.
lithofin stain stop. i hav put 2 coats on tiles already.

my question is should i put a silicone joint in the middle of the 7.5mtr floor. this will be the brick effect.

i will be leaving a gap all around premiter walls.
i must thank rich,some great post`s have answered alot of questions already.
thanks.

**timeless john** · 25-01-2012

I can see your logic in a movement joint for the 7.5 length of floor but if there is no expansion in the screed at that point what purpose will it serve, the screed could crack anywhere - unless there is a visible join.
Has the UFH been tested?

**macken** · 25-01-2012

yes the ufh has been on and off since start of year.
heating has been turned off now.
after reading here last week about 600x600 coming up after 3 years it just made me paranoid about trying to do the right thing.

**Rich** · 25-01-2012

Thank you mate, glad the posts were of some help

As John says, it sounds like there should be a joint in the screed. I think I would still put one in the tiles for my peace of mind, I work on 5m with UFH and 10m of tiling without it.