clay soil in crawl space
You need to regrade the land so water flows away from the house.
Mixing clay surface soil with sand is more suited to preparing the soil for planting as opposed to controlling flooding. Once soaked into the soil the water still has to go somewhere.
Excavating the first 12 to 18 inches in from the perimeter all the way down to the footing bottoms (or down to more porous subsoil if you get there first) and backfilling with pure sand or gravel is superior to taking up a layer of clay soil over the entire area of the crawl space and mixing with sand.
Do not excavate all around a column footing such as used for deck support posts or houses on stilts. I am guessing that it is safe to excavate up to a column footing no more than on two opposite sides not getting within 18 inches.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.
Last edited by AllanJ; 07-21-2012 at 09:34 AM.