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Re: Raised garage slab

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The system that Dennis described is what I've used.  You should have a waterproof membrane under the topping slab, perimeter curbs under the garage walls, and positive slope of the entire floor out the garage door -- we had a grated trench drain just outside the door because the driveway sloped toward the garage.
Nels Roselund
Structural Engineer
South San Gabriel, CA