ufh

[kevin67]

i posted about a week ago about a job i had coming up with water ufh 25mm ply on top and then i was going to use a de-coupling membrane then trav tiles. the problem is that the plumbers who were fitting the ufh were told to lay 25mm ply with extra noggins. i went round to have a look yesterday after they were finished and what they have done is lay 18mm chipboard then 18mm ply on top of the chipbord (don't know why and customer can't get a hold of them).

my worry is that with the 18mm chipboard then the 18mm ply then the membrane and tiles, will the heat get through all this?

cheers in advance

[nybor62]

whats the main sub base is it concrete or sand and cement screed over the ufh pipes,

[kevin67]

no its joists under the floor the chipboard is laid ontop

[nybor62]

so what are the under floor heating pipes set into

[kevin67]

not sure mate only seen it when it was finished, the customer says they run under the joists with metal plates that the pipes heat up

hope this helps cheers

[Mike]

sounds like they're just drilled through the joists . i've seen it done like this, it seems a large area under the boards to heat and a lot of wasted heat imo

[nybor62]

yeah thats what i was thinking mike

[kevin67]

cheers guys, so do you not think that the heat will get through all this

[nybor62]

hi kevin i dont see how you will get enough heat into the tiles imo

[kevin67]

cheers mate that was my worry. if i was to lift the ply up and put 6 mm hardibacker down then the membrane would this be any better.

[nybor62]

the pipes need to be covered with a dry sand and cement screed the pipes will be fixed to insulation boards between the joists i prosume ,
http://www.bordersunderfloor.co.uk/u...g_diagrams.htm

[kevin67]

i don't know this mate meeting the customer tomorrow so i'll find more out then cheers