im using 4" posts aswell this only shows up to 3 3/4" posts
12" diamater by 24" deep says 2 and 3/4 bags.if you have a proper tool to get a decent sized hole id use less bags but diggin down with a thin spade isnt easy for that.
http://shop.parkerbs.com/pub/files/L...246_H02593.pdf
Last edited by stevenebm; Mar 16, 2010 at 06:44 PM.