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Thanks for the advice that's really useful - I didn't know therre was a proper gun for the expanding foam so will try that - will have to see how it goes spraying upside down! May end up using rock wool bot it's expensive to buy a full roll just to fill some gaps. Thanks

Some of the gaps are pretty minute and I can probably fill them with some caulk -but not sure of the insulation value of this stuff, big gaps are at least 250mls, will probably fill with bits of sliced kingspan if no other ideas are forthcoming but its a lengthy process and not very efficient...

Yes, leaving bottom half of beams exposed. Thanks

I am currently installing Kingspan to the underside of an existing plasterboard ceiling. The property is an old barn, the room a bedroom with exposed beams, The insulation sitting between the beams ready to plasterboard and skim to create a new ceiling and warmer room. I have fitted battens to...