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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. 

The least costly way to keep grass from growing is also the most labor-intensive: regular weeding. Pull out grass blades as you see them pop up through the soil in areas where they’re unwanted. Another cost-effective way to keep grass from growing is by spreading a thick layer of mulch on the area as this will suffocate the grass.

Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

If you have a large area of brush and vegetation to clear, forestry mulching may be the best option. This method works well for relatively flat areas that don’t have many large rocks or mature trees to clear. Forestry mulching is a relatively quick process that improves soil health, reduces fire risk, and leaves behind usable mulch.