(1) Where a pipe carrying steam or hot water at a temperature above 120°C passes through a combustible floor, ceiling or wall, the construction shall be protected by a sleeve of metal or other noncombustible material not less than 50 mm larger in diameter than the pipe.
(2) Unprotected steam or hot water pipes that pass through a storage space shall be covered with not less than 25 mm of noncombustible insulation to prevent direct contact with the material stored.