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to insulate underside of roof, you can use; mineral wool; sheep's wool but these are hard to secure. foil backed PIR (polyisocyanurate) Insulation panels is the way to go.
Kingspan and Celotex both easily available and easy to cut with a bread knife, look at 100mm Kooltherm K107. you tube has fixing methods usually pinned with mechanical fixings.
12x24 battens at 600mm centres running from ridge to eaves should provide cavity space between soffit and insulation. let us know how you get on.
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Also should I be leaving an air gap between the insulation and the existing ceiling/roof?
Not just an air gap, but a ventilated one - irc, 50mm is recommended.
You could put air vents into the roof itself, i guess.
almac68
NotThamesWater
@Sam_w
So I want to insulate between the internal beams of my log cabin roof, both for heat retention and also to minimise rain noise.
I plan to stuff insulation up and then batten and put a false plywood ceiling up.
Question is, what insulation to use and what depth? The beams are 200mm deep, so can take a fair amount, and there are no headroom issues.
Also should I be leaving an air gap between the insulation and the existing ceiling/roof?
I realise that insulating the outside is better, but it had a new covering put on last year, so no way that is being taken off again.
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