Insulating & boarding outbuilding

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15 Aug 2023
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Hi all,
hoping someone can give me clarity on if my plan will work.

I have a 4.5m x 3.5m single skin flat roof outbuilding which I’m planning to use as a bar/man cave. There is a DPM below the concrete & I have also tanked the walls & floor for good measure.
my plan was to use 2x1 battens with a damp proof strip (go between brick/block & batten), at 400mm to centre. then for the walls get Celotex PIR 40mm insulation combined with tapered edge 12.5mm plasterboard for speed and fit them on top of the battens to create a vapour barrier cavity. Then to skim, paint etc.


for ceiling very similar but get separated 60mm PIR insulation (Celotex) and fit between joists then 12.5mm plasterboard on top, skim, paint…

does this sound like a solid plan or am I missing something..



thanks for any advice & suggestions.
 

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