Hull Construction Regulations

41 (1) Every “A” Class division shall be constructed of steel or similar material, in either case stiffened so as to be capable of preventing the passage of smoke and flame throughout a standard fire test of 60 minutes duration; the division shall have an adequate insulating value having regard to the nature of the spaces adjacent thereto, and if the division is between spaces either of which contains adjacent combustible material, it shall be so insulated that, if either face of the division is exposed to a standard fire test of 60 minutes duration, the average temperature on the unexposed face of the division will not increase at any time during the test by more than 139°C above the initial temperature on that face nor shall the temperature at any one point thereon increase by more than 180°C above the initial temperature.

(2) Every “B” Class division shall be capable of preventing the passage of smoke and flame throughout a standard fire test of 30 minutes duration; every such division shall have an adequate insulating value having regard to the nature of the spaces adjacent thereto; the division shall be so constructed that, if either face thereof is exposed to a standard fire test of 30 minutes duration, the average temperature on the unexposed face of the division will not increase by more than 139°C above the initial temperature on that face, nor shall the temperature at any one point thereon increase by more than 180°C above the initial temperature, provided that any division that is constructed wholly of incombustible material shall be required to comply with the foregoing requirement relating to increase of temperature only during the first 15 minutes of a standard fire test.