Does anyone know anything about gardening?

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ColinTheBald in reply to @andyfallsoff

Presuming a void between the base and the building it sounds a little snake oil to me, find out what insulation they specify, it's normally inexpensive.

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andyfallsoff in reply to @ColinTheBald

I think part of the point is to get around the void above the concrete as for a garden office, height is an issue - I think it will be a solid insulation layer under the concrete. But I am just repeating what I recall / have found on Google, until I speak to them later on.

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