Gravel & Base Materials

Unsure whether your project needs imported borrow or engineered fill? This contractor-focused guide breaks down key differences, geotechnical requirements, testing, and delivery considerations—so you order the right material before inspections begin.

Rip Rap SLP Rock is an angular, heavy-duty stone designed for slope protection, erosion control, and drainage applications. Available in 3–24"+ sizes, this durable material stabilizes embankments, shorelines, and culverts. North Bay Materials delivers Rip Rap across Marin, Napa, Sonoma, and Solano counties with fast local dump-truck service.

Permeable base rock and regular base rock serve very different purposes. Contractors, engineers, and architects need to know which to specify for strength, drainage, and compliance. This article breaks down Caltrans standards, structural performance, and practical applications to help you choose the right base material for projects across Marin, Napa, Sonoma, and Solano counties.

Discover why drain rock is one of the most versatile materials for landscaping and construction across Marin, Napa, Sonoma, and Solano. From French drains and driveways to erosion control and decorative creek beds, North Bay Materials delivers the right size rock straight to your project site.

Learn what Class 2 base rock is and how to use it in driveways, roads, and patios. Now delivering ¾″ road base by the yard in Napa, Vallejo, Benicia, and surrounding cities.