So our driveway uses a limestone and peastone setup that seems to compact nicely and wicks moisture down well, under that is a landscape membrane and was shaped to flow water to a trough point opposite of the house. It is very resistant to weed and grass and seems to not retain water as well as our garage does. I am considering the same approach in the 16x20 shed in the rear of the house. I'm not certain if it is helpful but I'll be following along with interest as well.
Adrian_Thompson (Forum Supporter) said:Maybe I'm over thinking the moisture issue. The camper currently lives outside under my in laws house on concrete. I need to move it a couple of times a year due to flooding. The sail boat sits outside under a tarp. But in both cases there's ample airflow around to dry things out compared to a leaky canvas door. Also I can't rule out buying an electric golf cart in the future too, and that would need to sit in there.
Thoughts
I agree. The building is essentially a 3 sided lean-to, and the 3 sides have lots of gaps. It's there to keep the sun and rain from abusing the contents, but you're not really going to be able to do much about moisture/humidity without lots of work and expense. If you really wanted to prevent things from rusting or mildew-ing you'd need tighter construction, insulation, and HVAC. That doesn't mean that a better floor is a waste, but I don't think a vapor barrier is necessarily going to achieve what you want
In reply to imgon :
I did this as well except I levelled the area (30x48), laid down a heavy vapor barrier and laid 2x4's flat and then filled between them with crush, and screwed down 3/4 inch plywood. Its 14 this year and still in great shape. I used to drive my loaded tandem dump truck in with no issue and the fossil spends every winter on it. I should say there is a deep rock subgrade that allows the heavy equipment.
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