"Dave Liquorice" Wrote in message:
On Sun, 4 Oct 2020 15:00:43 -0700 (PDT), Tricky Dicky wrote:

... the plan being to fit the Celotex between the joists and fill any
gaps around the edge with PU foam. However, some of these gaps also have
cables passing through so just to check does PU foam react like
polystyrene with PVC?

Donno but I'd side step the issue by cutting the celotex to be a snug
push fit and simply taping any joints. Foamed in would make any
future access behind the insulation a right PITA.


+1
--
Jimk


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