Wet underfloor installation

**paulvdavies** · 04-12-2010

Hi,
Looking for advice on porcelain installation over mostly new screed and part wooden floorboards all with wet underfloor heating. Approx 60sqm in total three seperate rooms. I am thinking that in area of floorboards approx 10sqm, replace with ply/backer boards, use ditra over whole area-floorboards and screed, incorporate movement joints above where wood/screed butts and use flexible adhesive and grouts for all.
Can anyone advise if I am going seriously wrong! I did talk to Schluter and they said that Ditra over the wood is not guaranteed, so is there a better solution to this predicament!
Any advise truly welcomed!!
Brother in laws house so cannot afford to get wrong!

**tfs** · 04-12-2010

I think the way you have mentioned is the way to go mate.

**tfs** · 04-12-2010

you can speak to ditra and ask if they recomend expansion strip between rooms at door openings, expansion gaps/ strips around perimiter of room etc as well as bridging over the two different substrates.

Everything that you do to eliminate the chances of failure will prove to be beneficial.