Text in force at 23-63: from 23-0, effective 1 Feb 1965.
Each part of the structure must--
(a) Be suitably protected against deterioration or loss of strength in service due to any cause, including--
(1) Weathering;
(2) Corrosion; and
(3) Abrasion; and
(b) Have adequate provisions for ventilation and drainage.
29 FR 17955 · Source