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I did my shed (6m by 8m) with the air cell to the walls and roof as I sheeted it and then lined the inside walls with what ever I could get. The cost of the air cell was about 1k and I haven't had a winter in it yet bet the summer temp is a cool 15 degrees less inside on a 40 deg day. I was told the air cell was ok to retro fit but check with the suppliers.
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Oh, one further thing, see in the photo in my last post. You see the light shining through under the corrugated sheeting ? I heard that you can get specially shaped foam to plug this gap. Does anyone know what this is called?
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Laserlite do eave infill strips, flat on the bottom & the top is corrugated to match the sheets. Comes in white or charcoal. On their website, available at their stockists.
Diggers also do some, in a bitumen impregnated polyurethane foam. Here. Once again, at their stockists.
Cheers.........................Sean