I don't use sand because it does freeze, instead I use what is called "stone dust",
I do mix a couple of bags of salt in with it, just to draw the moisture out.
I'll even throw some wood stove ashes in the mix, works great on ice,
right now it's in a 4X8 box with lid but this summer I'll be making some type of shelter just for this.
Can also use it to fill in the ruts on our gravel road, it's about $200 for a 5 ton load.
I store sand in 5 gallon buckets in an enclosed and unheated shed for winter spreading. It does not freeze up in lumps or anything. It is very dry to start with though...
I hear ya Dave, I don't know what it is about sand, but it just seems to soak up the humidity.
I suppose if you got it "dry" and kept it dry, "sheltered", you could be alright, I don't know.
I know, stone, as in stone dust will not retain water.
Try it out and if you find the secret to it, let us know, sand is much cheaper.
I've been working on shed designs for a next summer project. I'm thinking of a combined wood and sand shed, those two things ought to co-exist okay. The sand area is going to need a 10' ceiling to get any depth in the sand pile dumping from the FEL bucket, and the interior walls will need to built like a horse stall for stiffness and retaining the sand.
I don't think salt bothers PT lumber. I know it would eat concrete so I think a vapor barrier like 6 mil plastic on the ground would be the floor for the sand pile.
You know, that sounds like a great idea, I just may use it.....
I also have a wood shed, it's not really high enough but having them "both" together sounds good.
I'll have to think on modifying the existing one to get that 10 feet and widening it for gravel.
I don't know about the plastic flooring, going in and out with the loader, I'm thinking it may not last too long. I know in my tempo "garage" I have a crushed stone floor, on top of that, I made a floor out of 2X4's, cross piece's set evenly embedded in the stone and then the other 2X4"s screwed in on those.