Canada Wood Today | The Canada Wood Group

Midply Successfully Pre-Tests for a 2-Hour Fire Rating

Hidehiko Fumoto

By Hidehiko Fumoto

Deputy Director and Manager Technical Services, Canada Wood Japan

May 4, 2015

midply2Seeking to break through the 2 hour fire rating barrier, both the 2×4 and P&B sectors have started to conduct preliminary tests to assess the feasibility of achieving 2-hour fire resistive ministerial approvals. The 2-hour fire resistive structures would allow for the construction of wooden buildings from 5 to 14 storeys. Currently all wooden buildings are limited to 4 storeys or 4 storeys of wood on one storey of concrete under a 1-hour fire rating.

midplyThe Japan 2×4 Home Builders Association recently conducted a preliminary 2-hour fire test on a partition wall specimen (photo right). This wall is divided into 2 equal parts; with the left side as a conventional 2×4 wall and the right side as the Midply Wall System. Both parts showed the sufficient fire resistive performance after 2-hours of burning. Based on these successful test results, COFI and the 2×4 Association plan an ambitious two year technical project where a total of 84 specimens will be fire tested. This test program project is expected to commercialize large scale & Mid-rise wooden structures with Midply Wall System.