[RTflorida]

I used James approach. Level slab, built the stand, and made a thick slurry of type S mortar, sand, a bottle of acrylic bonding agent. coated the entire inside of the stand block then floated about 1/4" of slope on top of the slab. So far, so good (its been a year) we have horizontal rain every day in the summer, have never had water get more than 3-4 inches past the doors on my wood storage area and it runs back out under the doors - never reaching the wood.
The type S slurry has held up...no cracking or damage from tossing wood on top of it. My only expense was the bonding agent ($8 or $10), as I had plenty of type S and sand at the time.

RT