Subgrade Preparation Essentials for Concrete Driveways

The subgrade should be compacted and have an even thickness. A standard driveway is 4" thick—you want 4" thick continuously, not a 3" to 4" varying thickness.

Many western states have expansive soils. In these conditions, from 2" to 8" of crushed rock should be used as subgrade material depending on the soils level of expansiveness. If you have doubts about the soil characteristics in your area, consult a soils engineer.

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