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I am planning to insulate my loft ceiling (floor, not rafters). This is just for storage and not habitation.
I want to use Celotex insulating board, rather than Rockwool.
If I insulate between the joists and then a layer on top of them (to achieve the required U-value), can I then place chipboard directly on top of the Celotex, or does it need supporting?
Do I also need to leave a ventilation space between the plasterboard and celotex in the joists to avoid interstitial condensation (as with insulating rafters?).
Thanks
I want to use Celotex insulating board, rather than Rockwool.
If I insulate between the joists and then a layer on top of them (to achieve the required U-value), can I then place chipboard directly on top of the Celotex, or does it need supporting?
Do I also need to leave a ventilation space between the plasterboard and celotex in the joists to avoid interstitial condensation (as with insulating rafters?).
Thanks