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Yes, rubber mulch allows water to seep through and reach the soil underneath. Rubber mulch is not as absorbent as organic mulch, which allows the soil underneath to stay moist and hydrated. Keep in mind that the permeability of rubber mulch can get clogged by landscape fabric and other additional materials.

A 40-pound bag of topsoil covers 0.76 cubic feet, enough for 4.5 square feet with a 2-inch depth or 36 square feet with a .25-inch depth, such as topdressing a standard garden bed. If you want 2 inches of fresh topsoil for your 36-square-foot garden bed, you’ll need eight 40-pound bags.

You can fill the holes weeds leave behind with soil or sand to avoid unsightly spots or tripping hazards. If you remove weeds from a grassy area, fill the hole with soil and grass seed, and water regularly to promote grass growth.

How much 4 yards of dirt will cover depends on how deep you want the soil to be. In general, a yard of dirt will cover 324 square feet for a 1-inch depth or 100 square feet for a 3-inch depth. Therefore, you can expect 4 yards to cover between 400 and 1,296 square feet if you keep your soil depth between 1 and 3 inches.