StacksVerified U.S. regulatory reference

46 CFR §32.56-20

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The following exterior boundaries of superstructures and deckhouses that contain accommodation, service, and control spaces, except wheelhouses, must be insulated to “A-60” Class:
  1. (a)The exterior boundaries that face the cargo area.
  2. (b)The portion of the exterior bulkheads and decks within 3 meters (10 feet) of these boundaries.