SURVEY AND RESEARCH ON FIREWALLS BEFORE THE ENACTMENT OF THE BUILDING STANDARD LAW IN 1950 (PART 3): FIRE RESISTANCE TESTS OF DIVIDING WALLS IN ATTIC SPACE COMPOSED OF METAL LATH WITH MORTAR FINISH TO BOTH SIDES

Abstract

The dividing walls in the attic space of the wooden building of the Second Faculty of Engineering of Tokyo Imperial University were metal lath with mortar finish to both sides of the studs. The current Building Standard Law requires these dividing walls to be of quasi fire-resistive construction. Two specimens were examined for their ability to resist a 45-minute standard fire exposure. The heat transfer analysis was used to discuss the effect of mortar thickness on the temperature distribution in the wall.