§ 260. Incombustible, fireproof and fire-resisting or fire-resistive
material. 1. "Incombustible material" means material which will not burn
or support combustion as determined and specified in the rules of the
board.

2. "Fireproof material" means material capable of resisting the effect
of fire to a sufficient extent to insure the safety of the occupants of
the building. The board shall determine and specify in its rules what
materials are fireproof materials.

3. "Fire-resisting material" or "fire-resistive material" means
material conforming to the requirements of the board which shall
determine and specify in its rules what materials, not being fireproof
materials, are fire-resisting or fire-resistive materials.