---
kind: "section"
citation: "46 C.F.R. § 32.56-20"
title: "46"
number: "32.56-20"
heading: "Insulation of exterior boundaries: Superstructures and deckhouses—T/ALL."
url: "https://uscodex.org/cfr/46/32.56-20"
---

# §32.56-20. 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.**

## Notes

### Source

Source: CGD 74-127, 41 FR 3844, Jan. 26, 1976, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 2103, 3306, 3703, 3719; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4; Subpart 32.59 also issued under the authority of Sec. 4109, Pub. L. 101-380, 104 Stat. 515.

### Source

Source: CGFR 65-50, 30 FR 16671, Dec. 30, 1965, unless otherwise noted.