On 31/07/2020 08:31, The Natural Philosopher wrote:
On 31/07/2020 08:20, Tricky Dicky wrote:
As part of the kitchen refurbishment I am looking to insulate the
floor which at present is a suspended T&G floor on 100mm joists. I am
looking at fixing 25 X 25 battens to the bottom of the joists and
dropping 75mm foam insulation in between the joists. Any advice
regards preferences between Kingspan or Celutex or is it just a case
of whichever I can get at the best price?

Richard


it is just a case of whichever you can get at the best price.

No need for the battens either - just wedge the sheets in place and use
expanding foam to fix and fill any gaps. Remember to foil tape over the
joists as well..


I used Quinntherm in 70mm thickness because they all seemed to have
a consistent thickness, essential if you have a floating floor.
The sheets of Celotex in Wickes had a slight undulating thickness.