Insulation of exterior boundaries: Superstructures and deckhouses—T/ALL.

The following exterior boundaries of superstructures and deckhouses that contain accommodation, service, and control spaces, except wheelhouses, must be insulated to “A-60” Class: (a) The exterior boundaries that face the cargo area. (b) The portion of the exterior bulkheads and decks within 3 meters (10 feet) of these boundaries.