75mm screed over UFH

[marsaday]

i have done all the prep work and am a bit worried that the screed will be too thin. this is what i have done.

1) dug out kitchen and leveled with a 2" screed

2) laid visquene layer and then 75mm of celotex boards.

3) i have taped the boards

As you walk over them there is a definite amount of movement due to the visquene layer. i laid the boards initially without the visquene layer and there wasnt as much movement.

Will the 75mm screed push these boards fully flat?

 

[marsaday]

anyone got any experience of laying a screed onto kingspan type stuff. i dont want it to sound hollow

 

[lagunaglen]

I did some ufh twice last year and what your doing sounds fine, the builder i worked for screeded floor, then insulation ,taped up then 65 mm on top of pipes and it was all fine

 

[Biggles..]

Sounds good so far,jounts taped, screed depth ok.

Have you used the insulating strips round the edge of your celotex/kingspan (stops heat travelling out through your walls etc).