Question
Hi,

I am installing a ~6ft tall retaining wall in my backyard.  The area where my house was built used to be sand dunes so my backyard (except for the first 1-2') is all sand.  I'm having difficulty keeping the sand from caving in on what I've dug out and I was wondering if you have any suggestions that might help.  I doubt there's anything full proof, but anything you think may help would be appreciated.  

Thanks

Answer
Hello:

Construct a caisson. This can be done with sheet or wood pilings. Drive the pilings into the sand and then excavate the sand from the caisson formed by the pilings.


Mark Harshman


For more comprehensive help check out my website at:

http://www.prestoexperts.com/expert/markland