Depends thickness divide your thickness of slab 1nto 1 yard. ie. if your slab is is 6inches deep divide 6 into 36 which is a yard this will give you 6 square yards.
Speaking mathematically, one yard of mulch would be nearly 3 feet or 36 inches. (site) The problem here lies with the question. Landscape mulch is not measured by the yard it is measured by cubic...
1 cubic yard covers 324 square feet per inch of thickness, divide 324 by thickness in inches to get coverage, i.e. 4 inches thick would cover 324/4=81 square feet, 36 inches thick would cover (you...