Bulk Aggregates near Tuscaloosa, AL, 35406

Slopes need an interlocking base

The USDA soil survey maps the ZIP's center point as the Smithdale-Flomaton complex, with 15 to 35 percent slopes. On a sloped driveway or patio approach, choose angular Crusher Run or Road Base for a compacted layer that resists movement better than round stone.^[1]

Smithdale makes up 45 percent of that map unit, and the top mineral soil is fine sandy loam. Put geotextile beneath a crushed-stone base where excavation reaches this soil, so traffic and compaction do not blend the fine sandy loam into the stone.^[1]

The soil is well drained and falls in hydrologic group A, where water soaks in fast and runoff is low. A driveway base should focus on interlocking support, while Drain Rock is useful where roof runoff or an edge drain concentrates water.^[1]

Excavation can expose mixed sediments

The mapped geology at the ZIP's center point is the Tuscaloosa Group, Coker Formation, with sand, clay, silt, gravel, and chert. Keep any soft clay separated from the stone layer during excavation, and use crushed angular material where the project needs a firm base.^[2]

The USDA soil survey rates shrink-swell in the top 100 cm as low, at 1.5 percent. Lower soil movement supports a stable crushed-stone base, but the base still needs even compaction before a driveway surface or patio is placed.^[1]

Rain and freezes favor free drainage

The NOAA station at Bankhead L&D, AL, about 10 miles away, reports 60.2 inches of average yearly precipitation. Give a driveway or patio base a route for water to leave, using clean #57 Stone or Drain Rock where a drainage layer is needed.^[3]

The station records 60 days each year with lows of 32 F or colder, with a median last spring freeze of March 20 and first fall freeze of November 11. Keeping water out of a base with clean drainage stone limits the effects of water held beneath a paved or compacted surface during freeze periods.^[3]

Material choices for detached home sites

Census data lists 8,537 housing units in ZIP 35406, with 74 percent as detached single-family houses, compared with 49 percent across Tuscaloosa. For a detached-home site, keep driveway-base material separate from garden-bed material by using Crusher Run or Road Base for support and Top Soil for planting areas.^[4]

The Alabama Department of Transportation names Crushed Aggregate Base, Section 825, Standard Specifications for Highway Construction (2026), as a road-building standard. Residential driveway and patio material choices should instead follow the support and drainage needs of the site.^[5]