06-01-2008, 01:44 AM
My sloped driveway dropped more than 6" from the time I bought the house a decade ago. Bad grading and water from a downspout going under the concrete had the whole slab dropping. Fortunately, it dropped in one piece and did not break up.
We had the concrete filler folks come out and raise the driveway slabs up. They drilled a hole and pumped concrete under the slabs. We then had the sidewalk brought up to the new (original) level since it too had washed out. Then we raised the floor of the garage which also had sunk a couple of inches. Talk about bad grading!
Anyway the job worked well for us (so far).
One other thing you might consider for the air conditioning unit would be to make a deck-like structure for it to sit on. Four 4x4's on the corners drilled deep enough that any further erosion would be above the them with a wooden floor on which the compressor sits.
We had the concrete filler folks come out and raise the driveway slabs up. They drilled a hole and pumped concrete under the slabs. We then had the sidewalk brought up to the new (original) level since it too had washed out. Then we raised the floor of the garage which also had sunk a couple of inches. Talk about bad grading!
Anyway the job worked well for us (so far).
One other thing you might consider for the air conditioning unit would be to make a deck-like structure for it to sit on. Four 4x4's on the corners drilled deep enough that any further erosion would be above the them with a wooden floor on which the compressor sits.