46 CFR § 42.25-20 - Computation for freeboard.

---
identifier: "/us/cfr/t46/s42.25-20"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 42.25-20 - Computation for freeboard."
title_number: 46
title_name: "Shipping"
section_number: "42.25-20"
section_name: "Computation for freeboard."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "LOAD LINES"
part_number: "42"
part_name: "DOMESTIC AND FOREIGN VOYAGES BY SEA"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 5101-5116; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.4; section 42.01-5 also issued under the authority of 44 U.S.C. 3507."
cfr_part: "42"
---


# 42.25-20 Computation for freeboard.

(a) The minimum summer freeboards must be computed in accordance with §§ 42.20-5 (a) and (b), 42.20-13, 42.20-15, 42.20-20, 42.20-25, 42.20-30, 42.20-35, 42.20-60, and 42.20-65, except that § 42.20-60 is modified by substituting the percentages in table 42.25-20(a) for those given in § 42.20-60:

Table 42.25-20(**a**)—Percentage of Deduction for Superstructure

[Total Effective Length of Superstructure]

|  | 0 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1.0 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Percentage of deduction for all types of superstructure | 20 | 31 | 42 | 53 | 64 | 70 | 76 | 82 | 88 | 94 | 100 |
| Percentages at intermediate lengths of superstructures shall be obtained by linear interpolation. |  |  |  |  |  |  |  |  |  |  |  |

(b) The winter timber freeboard shall be obtained by adding to the summer timber freeboard one thirty-sixth of the molded summer timber draft.

(c) The winter North Atlantic timber freeboard shall be the same as the winter North Atlantic freeboard prescribed in § 42.20-75(d)(1).

(d) The tropical timber freeboard shall be obtained by deducting from the summer timber freeboard one forty-eighth of the molded summer timber draft.

(e) The fresh water timber freeboard shall be computed in accordance with § 42.20-75(e) (1) or (2) based on the summer timber load waterline.

[CGFR 68-60, 33 FR 10067, July 12, 1968, as amended by CGFR 68-126, 34 FR 9016, June 5, 1969; CGD 79-153, 48 FR 38650, Aug. 25, 1983]