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MLIT Minister Issues 5 Certificates for 2-Hour Fire Resistive Approvals

Hidehiko Fumoto

By Hidehiko Fumoto

Deputy Director and Manager Technical Services, Canada Wood Japan

October 11, 2016

Five certificates for approvals of 2-hour fire resistive performances of 2x4 exterior walls, partition walls, party walls and floor assemblies.

Five certificates for approvals of 2-hour fire resistive performances of 2X4 exterior walls, partition walls, party walls and floor assemblies.

Thanks to the joint efforts of COFI Tokyo and Japan 2×4 Home Builders Association, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) issued 5 certificates for 2-hour fire resistive PFC structures which covered approvals for performances of 2×4 exterior walls, partition walls, party walls and floor assemblies.  The partition walls included not only conventional PFC walls, but also a double midply wall system. These approvals were issued December 9, 2015 and September 6, 2016.  With these approvals, PFC buildings in Japan, which only allowed up to 4 storey wood frame, can now be as high as 6 storeys.  The Japanese building code requires 2-hour fire rating of principal building parts when the building exceeds 4 storeys.  In other words, in case of 6-storey buildings, the 1st and 2nd storey levels have to be 2-hour fire resistive, but the upper 4 floor levels can remain as 1-hour fire resistive construction.