Insulation on a concrete floor and lithotherm UFH

[Jilly]

No sign of the builder, so I'm researching if it will be possible to do some of the floor myself in my stable conversion (54m2 in main building). I've become convinced UFH will be good as there's no room for radiators.

 

The height is tight, there seems to be 150mm up to the  DPM ( ie 2 bricks) but it looks like we could go higher than this to take it near to the patio windows to make a flush ish entrance (if that makes sense). 

 

I'm scared of making a stuff up with wet screed so want to consider this build up:

 

Tiled floor (thickness up for discussion)

Lithotherm clay tiles as they are only 45mm thick and I can take my time , expensive but easy for diy. Need a very level surface.

Kingspan K103/ K3 100mm, expensive but short of space.

DMP (Big sheet of plastic lapped up the walls and taped? One sheet for each room? (Paint on DPM is a non starter, I can't do  fumes and the floor is rough)

The existing concrete slab (150mm thick)  has a slight slope and is a bit rough in places.

How best to level the floor? Would sand work? Might the clay tiles wobble? The thought of using floor levelling compound on a big area is intimidating...I might go too thick, get it wrong, loose some depth accidentally. 

 

Thank you!

[Temp]

See all the posts by "crusoe" here. He's used it. Not without some issues. See the follow up post on feb 23rd 2011.

 

http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=6212

 

 

 

Edited May 12, 2021 by Temp