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I want to insulate my loft with Celotex insulation boards
I am planning to insulate between and over the joists.
My joists are 90mm deep, but I am planning to use 50mm Celotex between them, followed by 50mm Celotex across the top.
I have 2 questions:
1. Should I rest the lower celotex against the plasterboard (which would leave a 40mm air gap to the top of the joists), or find a way to make it level with the top of the joists?
2. Will Celotex hold weight if laid directly across the joists, or do I need to support it with chipboard underneath (and then more chipboard on top)?
Thanks
I am planning to insulate between and over the joists.
My joists are 90mm deep, but I am planning to use 50mm Celotex between them, followed by 50mm Celotex across the top.
I have 2 questions:
1. Should I rest the lower celotex against the plasterboard (which would leave a 40mm air gap to the top of the joists), or find a way to make it level with the top of the joists?
2. Will Celotex hold weight if laid directly across the joists, or do I need to support it with chipboard underneath (and then more chipboard on top)?
Thanks