Wet UFH on Block & Beam and Joists...

[curtly]

Hi everyone,
We've an existing kitchen floor on Block & Beam + starting an adjoining extension with wooden joists. (has to be due to slope)

We are wanting 'Wet UFH' across both surfaces finished off with tiles but only have a maximum height on top of block & beam of 80mm (including tiles), is this realistically do-able ?? I appreciate that screed is probably out of the question due to the lack of height :-(
The new wooden Joisted extension can be any height but obviously matching/overlapping the existing kitchen.

Any help or advice would be really appreciated

Thanks in advance

Chris

 

[One Day]

Hi, your absolutely best option is bekotec-therm from Schluter. It uses a very thin screed and is perfectly designed for tiles.
Other low profile ufh systems are out there but where you save on the system, you'll need to spend more on prep for tiling.
I've recently used nu-heat lo pro and to be fair, it's ok. Total build up height is about 22mm before uncoupling membrane and tiles.

 

[White Room]

Another one Vario PRO Underfloor Heating & Uncoupling - http://www.tiletown.co.uk/en/vario-pro-ufh

 

[Dumbo]

Should there not be a recommended thickness of celotex on top of block and beam floor . If I remember rightly we had to have a minimum of 80 mm to comply with building regulations

 

[curtly]

Hi, your absolutely best option is bekotec-therm from Schluter. It uses a very thin screed and is perfectly designed for tiles.
Other low profile ufh systems are out there but where you save on the system, you'll need to spend more on prep for tiling.
I've recently used nu-heat lo pro and to be fair, it's ok. Total build up height is about 22mm before uncoupling membrane and tiles.

Would the Nuheat LoPro Max require an insulation layer then chipboard underneath it first ?

 

[curtly]

Should there not be a recommended thickness of celotex on top of block and beam floor . If I remember rightly we had to have a minimum of 80 mm to comply with building regulations

For the extension area this should be do-able as its joists, the existing block & beam currently has 30mm foam + 25mm chipboard on top

 

[One Day]

Hmm, unsure. You'll need insulation. How much and how thick i can't say. Mine was into existing uninsulated concrete.
Nu-heat are clued up, might be worth a call.
There's got to be thinner alternatives in 2017?!

 

[Dumbo]

Take out chipboard . Put in 125 guage slip coat (I think that's the thickness) fix ufh to insulation then pump screed on top

 

[Dumbo]

If you can fit in wooden joists why can you not fit in block and beam floor again it would be better than introducing wood .

 

[curtly]

If you can fit in wooden joists why can you not fit in block and beam floor again it would be better than introducing wood .

That's a very good point, I'll speak to the builder...