StacksVerified U.S. regulatory reference

46 CFR §32.56-40

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Structural insulation within category A machinery spaces must have a barrier such as metal foil, sheet metal, cementitious coating, or other vapor barrier so that the surface of that insulation is impervious to oil and oil vapors.