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RE: Raised garage slab

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This is a common issue in PA and MD, IRC requires and engineered design if you need more than 8" of earth or 24" of gravel or sand. We specifiy a loose fill, on site material, and design grade beams at about 10' on center. The grade beams are simply shovel out of the loose fill and reinforced along with the slab. This usually requires a few piers to work with the the 10" on center grid. We use the IRC live loads of 50 psf or and 2000 lb point load criiteria. Sometimes only the back half will need to be reinforced if the entrance is at natural grade.

This design will allow for the fill to completly settle away from the slab and leave the slab in place.

Jeff Fertich, PE
Gettysburg, PA

From: Mark Pemberton <markpemberton(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: Raised garage slab
Date: Mon, 12 Apr 2004 17:17:38 -0700 (PDT)

I am doing residential structural plans for a construction company that would like to raise the garage slab above a sloped grade to reduce the amount of fill required. This sounds like a bad idea, but I know I've seen it in plans in the past. Does anyone have any suggestions regarding this condition? My knee jerk reaction is to talk the company into doing retaining walls with gravel fill as I'm used to typically seeing. Any comments are appreciated.

Mark Pemberton, S.E.
Pemberton Engineering
Davis, CA

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