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Yes, you need to use landscape fabric under your rubber mulch. Rubber mulch doesn’t decompose, so putting landscape fabric down can work as a barrier between your mulch and soil, preventing your mulch from mixing with your soil and leaching chemicals like aluminum, cadmium, and copper into it. Also, since weeds can occasionally get through rubber mulch, using landscape fabric as a second form of protection can increase its effectiveness. 

If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

How tall your mulch should be around your tree depends on the type of mulch you use, but aim for 3 to 4 inches as a rule of thumb. You’ll want to avoid simply piling it up in hopes of offering additional benefits to your tree. Volcano mulching is the infamous term for piling way too much mulch against the stem of your tree. This could actually kill your tree or severely harm it, as your tree trunk needs space to breathe without too much moisture.

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.