My 30x40 home shop has the slope on the "short" side (the 30' direction) and it's never been an issue. I had to shim up the frame table quite a bit but I had to level it anyway so it didn't matter. I can visibly see the difference at the sills but, again, never been an issue. The cars don't roll away on their own, the toolboxes stay where I put them, honestly it's not an issue at all.
I've heard that the slope is per building code so that any spilled fuel runs out the door-I have no idea how true that is.
Peter
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