Weight differentials So, we have discussed how the base needs something to push against in my previous post. Now I want to address the frame that holds the whole thing in place. Let’s start by explaining some weight differentials. 1 Cubic yard of aggregate commonly weighs between 2000 and 3000 pounds . That’s approximately 110 pounds per cubic foot. Sand and ballast are virtually the same except sand can weigh as much as 130 pounds wet. Metal frames There are many great