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Leon
I use two heavy duty plastic underlays - the kid you see in offices under large roller chair - the kind with large pimples that sink into carpet.
Why when everything is on pavers?
Well think of it - they create a layer of tough plastic which is raised about 4mm of the ground. Plastic is anyhydrous (water-proof) and the air closest to the ground is the coldest, and being flat and slightly rough at a microscopic level the plastic side facing the ground forms a perfect surface for water vapour to condense on - leaving the rest of the lab bone dry.
So under where I walk may collect 3 cups of water a night, but everything else pretty much stays bone dry.
Cost for mats - around $110 each from officeworks!
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