Eroding Dirt Foundation of Concrete Slab

Jack King wrote in news:wYH2k.5417$ snipped-for-privacy@fe087.usenetserver.com:

I'd talk to an engineer before doing anything. You might need to just replace the dirt, and you might need to do something drastic.

Speculation: Replace the dirt, then build a retaining system with concrete block.

Get thee to a foundation contractor.

You didn't mention what the slab is used for. If there is no significant load applied where the erosion is taking place, you could get away with replacing the dirt. You need to install some sort of drainage system around the perimeter, assuming that water is causing the erosion.

First, Slap the contractor.......What a nice guy..... I even put a small footing in a 3x4 stair pad just for that reason.....

Firemedic had written this in response to

: I have a 3' x 6' aggregate slab that holds 2 - 3-ton HVAC units. With our Southern soil, the clay-dirt has settled and/ or eroded underneath the pad over time (10+ years). Will placing supports of treated lumber (railroad ties, etc.) or steel with concrete support be sufficient or would you suggest excavating around the pad, building a block footer wall and then filling the void with concrete? Additionally, the pad does not currently show any signs of stress (cracks, fractures, etc.) and no signs of tilting or potential collapse.

Thank you.

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You may want to post some images of what the slab looks like, because I can't quite see how you are getting your erosion. Is it on a slope? If so then a retainer (personally I'd go for cement/block over wood) would make sense.

Where are you located? The freeze/defrost cycle might be a cause of the errosion.

Hul

Firemedic wrote:

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