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The most important thing to put under a rock garden is the appropriate soil. The specific soil needed will depend on the type of plants you’re growing as well as the environment you live in. You can also put non-woven or woven fabric under the rocks to add to the garden's structural stability.

Yes, grounds count when calculating box fill. A single volume allowance is made when up to four equipment grounding conductors or equipment bonding jumpers enter the box. It’s important to account for all wires and fittings when calculating box fill. Beyond the first four, each additional grounding conductor should be counted as ¼ volume.

A gravel driveway costs from $1.25 to $1.80 per square foot, including materials and installation. Cost factors for this project include the type of gravel, its thickness, and the amount of site preparation required.

Consider these cost estimates for a 20-foot-long driveway:

• 1-car (240 square feet): $300–$432

• 2-car (480 square feet): $600–$864

• 4-car (960 square feet): $1,200–$1,728

Here are gravel driveways costs for a 50-foot-long driveway:

• 1-car (600 square feet): $750–$1,080

• 2-car (1,200 square feet): $1,500–$2,160

• 4-car (2,400 square feet): $3,000–$4,320

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand.