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MARTINEZ — When installing a concrete feature such as a driveway or patio, it’s crucial to follow proper procedure—otherwise, the installation will be susceptible to settling over time. Here are a few important aspects to consider:
• Whether it’s plain soil or base rock, the subgrade (the native soil) needs to be properly compacted. Ideally, base rock should be compacted to a 98 percent proctor density, which will provide a solid surface for the concrete to lie upon.
• If the native soil doesn’t provide an adequate subgrade material, a fill alternative like sand, gravel or crushed stone may be necessary to achieve the low compressibility needed to support the concrete installation.
• To provide maximum reinforcement, the steel rebar should be placed at center depth of the concrete slab. For example, if the slab is four inches thick, the rebar should be placed at a depth of roughly two inches.