Firemedic had written this in response to
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: 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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