There shall be provided a two (2) hour fire resistive wall, without openings, between two (2) living units side by side. There shall be provided eight inch (8") masonry walls or material that is fire resistive equivalent, without openings, extending from the ground line to the bottom side of the underlayment of the roof, between living units in row housing, of three (3) or more living units, and between every two (2) living units in multiple-family dwellings, including modular housing. There shall be provided one hour fire resistive ceilings which divide living units horizontally. (1976 Code § 151.008)