weight of clay
Confidence votes 22. The weight of any soil will depend on how saturated it is with water. A rule of thumb is that a cubic foot of saturated loamy soil weighs about 20 pounds. Saturated clay would be heavier because it is denser than loam. According to the 1980 edition of Architectural Graphics Standards, clay that is damp and plastic (moldable) weighs 110 lbs/sq. ft. while packed earthen mud weighs 115 and wet sand and gravel weighs 120 lbs/sq. ft. Chippsetter.