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MLIT Announces Two New PFC Fireproof Floor Truss Approvals

Hidehiko Fumoto

By Hidehiko Fumoto

Deputy Director and Manager Technical Services, Canada Wood Japan

July 3, 2012

As part of the fiscal 2011 market access projects funded by Canada Wood/FII, COFI and the Japan 2×4 Home Builders Association have worked collaboratively on ministerial approvals of additional fireproof assemblies.  On June 12, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) approved two PFC floor assemblies; one with parallel chord trusses and one with thermal/sound insulation with wider ceiling joist spacing.  Parallel chord trusses are efficient solutions to achieve wide spans for floors and flat roofs.  This approach is especially effective for large scale public buildings.  The insulated floor assemblies have been in strong demand as the existing approval has been only applicable for those without insulation.  The demand comes from the necessity of insulating floor assemblies located above built-in garages.  The approved specification could also mean savings and materials as the original Ministerial Approval only specifies the ceiling joist spacing of 277.5 mm or less as opposed to the newly obtained approval of 455 mm or less