Posted by Bob Thompson on Wednesday, March 12, 2003 at 11:17PM :
In Reply to: burying air lines posted by Rick on Wednesday, March 12, 2003 at 11:00PM :
Depends on where you are. If you're in a cold weather climate you need to bury them below the frost line so they don't freeze or suffer from the ground heaving as a result of freezing & thawing. Typical depth of the frost line is 16 to 24 inches depending on location.
RDT