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The major pro observatories of the world sit on concrete structures 5 to 10m metres thick , not 75mm thick sitting on your back lawn
My garden shed sits on a 100mm thick concrete slab and there’s always moisture be it damp or cold damp all year round at night and worse after rainy weather and it sits on a slight sloping well drained block
The most efficient and cost effective way to minimise rising damp or moisture is a ventilated air space between the ground and the structure
That’s not an interesting theory that’s fact !
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