I've noticed dampness in the front 5' of my 20x24 detached garage a few
times when it rained in the past month or two (didn't really have any
considerable rain last fall). Yesterday I had enough water in the front
that I had to mop it out. After getting the standing water out, on a whim
I placed a torpedo level where the 9' garage door opening is. You guessed
it, the slab slopes IN torwards the inside of the garage. A rough guess of
1/4" over 4' from outside the entrance in to the front of the garage. It's
only on the right side, the other side slopes torwards the outside.

I'm at a loss as to what I can do. It's evident now why there was so much
more water on that side. Before I thought the rain was just so heavy and
blowing that it was seeping under the garage door; that's not the case -
it's flowing in!.

My 1st question is: is there anything I can do to change this? I assume
there is no way to block the water with weatherstripping or the like. I've
seen someone's garage where they had the weatherstripping glued to the slab
opening...would this work? Or, is there any kind of thin floor leveler or
cement I can put on the slab in that area to raise it enough to slope back
out?

Secondly it seemes to be coming in under the green sill plate where the T111
siding meets the slab by the door. Can I silicone that joint to keep the
water out?

Ideas/suggestions?