Choosing the Right Base Material for a Paver Patio in Arizona

Homeowners in Arizona planning a paver patio receive conflicting advice on base materials: ABC stone base (aggregate base course, also called crusher run), 1/4 minus, and mortar sand. One contractor claims ABC is a concrete mix, while others recommend different sands. The goal is to avoid settling and cracking experienced with a previous concrete patio.

ABC (aggregate base course) is an excellent, cost-effective foundation material that compacts well and retains flexibility, reducing cracking. It resembles concrete mix but does not achieve the same hardness. For the bedding layer, coarse sand is preferred over finer mortar sand because it drains better, which is crucial in Arizona's freeze-thaw cycles. A base of ABC topped with coarse sand provides a stable, well-draining foundation that minimizes settling.

Contractors suggesting 1/4 minus or mortar sand may not offer the same drainage and compaction benefits. The coarser sand allows water to move away from the pavers, reducing frost heave risk. Proper compaction of the ABC in layers is key to a long-lasting patio.