- 1). Place about 2 inches of soil in the bottom of the bench. The type of soil does not matter but avoid using peat moss that dries out and poses excessive heat options.
- 2). Check the heat rating for the cable. Choose a cable that provides 10 watts of heat per square foot of space. A bench of 8 sq. ft. would require a heat cable of 80 watts, for example. Place the cable in an even distribution around the bench. Press the cable about 1 inch into the soil.Check the heat rating for the cable. Choose a cable that provides 10 watts of heat per square foot of space. A bench of 8 sq. ft. would require a heat cable of 80 watts, for example. Place the cable in an even distribution around the bench. Press the cable about 1 inch into the soil.
- 3). Place a layer of 1/2-inch hardware cloth over the soil. This wire mesh with 1/2-inch spacing protects the heat cable from accidental damage by gardening tools.
- 4). Add about 4 inches of sterile soil to the top of the bench. Use potting soil, if desired, or any other mix desired for starting seeds.
- 5). Place the probe for the thermostat, if applicable, in the top soil of the greenhouse bench.
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