Easy Ways to Install Decomposed Granite: 14 Steps (with
#0183;#32;If it is uneven, such as for a path, measure its entire length, then measure the width where the path is widest. Multiply all 3 measurements together to determine the overall size of the hole. Decomposed granite is often sold by the cubic yard, so divide the size measurement by 27, the number of cubic yards in a cubic foot, to determine how much granite you need. [8]