Concrete curing in the humid Columbia River corridor takes longer than the bag suggests. Air entrainment and proper finishing matter most in Camas climates.
Vapor barriers under Camas concrete slabs are required for any heated or finished space. Clark County moisture moves up through soil and damages flooring.
Air-entrained concrete is the right mix for Camas. The tiny air pockets absorb freeze-thaw expansion and stop the surface scaling we see across Clark County.
How thick should a concrete driveway be in Clark County? Standard four inches works for cars; six is needed for trucks, RVs, and Camas WA clay soil sites.