Basements, Attics and Crawl Spaces - Insulating or venting sub floor over slab

I just lifted a 12x18 shed on 6x6 PT beams (long story short, the slab was too low, allowing some water to seep inside). Now, I'm in the process of installing a sub floor; 3/4" 4x8 sub floor panels on top of 2x6 floor joists that are resting directly on top of the concrete slab.

Question is; Should I vent this area by drilling holes on the side of the 6x6 beams, or not worry about it?

Or, what would be a good material to insulate this area?

We just went through several days of rain; all I got was a bit of water in two corners. Under heavy rain, I would expect more water to get in there.

Thanks in advance, take care.

- Abdon

Anybody?

I'm getting ready to lay down the plywood. Should I seal or vent?

I may turn the garden shed into a cottage, as it looks very nice on the outside already. This is why I'm thinking about insulation.

I'm also thinking about just filling up the space with non dissolving peanut foams. If I get them there nice and tight, what kind of R value could I expect? :D

I wouldn't go with the peanuts, too much space for water to be trapped.
You could consider rigid foam between and over the 2x6's to insulate the floor. To go over, you might have to specify a higher density foam board to avoid compression. By insulating at the floor level, you would then be able to vent the space below to dry any water that gets in.

Bud

I don't expect much water, I'm more concern with humidity by virtue of a cold place sucking it off the air. I imagine that if I displaces the air, what's left wont be able to raise the humidity as much.