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If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.

Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

Mulching any time of year can attract termites, so there’s no added risk in the fall. The important thing to remember is that termites are attracted to rotting wood, so you need to lay a thin enough layer that won’t trap too much moisture and lead to rotting. A layer between 1 and 4 inches thick should provide all the benefits you’re looking for without attracting termites.

A yard of crushed concrete costs between $20 and $50. A single-car driveway will need 1.5 to 2.5 yards of crushed concrete, putting your material costs between $30 and $125, which is much less than you’ll pay for most driveway paving methods. Your total could vary based on the thickness you’re going for, and, of course, total prices will increase with added square footage for driveways that fit multiple cars.