FFPRI Proposed Sugi Dimension Lumber Design Values Higher than SPF and D Fir-L
New Japanese species groups were proposed at the JAS dimension lumber standard revision committee meeting on October 16th, which included JSI, JSII and JSIII, consisting of Hinoki/Japanese Yellow Cedar, Sugi and Japanese Larch, respectively. For those species groups, the Forest and Forest Products Research Institute (FFPRI) proposed design values. We are extremely concerned about the values as Sugi values are higher than SPF for No. 1, No. 2 and No. 3 and some of them are even higher than those for D Fir-L.
After MAFF* revises the JAS standard, MLIT** is responsible for assigning the design values. However, once those concrete values are proposed, it becomes challenging to propose the alternative values. We have requested FFPRI disclose the raw data from which they have derived such unreasonable values. Currently, Canadian in-grade test authorities are reviewing the data provided and the derivation method. In the opening remarks at Canada-US-Japan JAS Technical Committee meeting on September 23rd in Vancouver, Canadian co-chair addressed that 1) it is important to follow internationally recognized standards and procedures for deriving the structural lumber design values, 2) In order to secure the non-biased and transparent practice based on internationally recognized scientific methodology, FFPRI should continuously disclose the test results and procedures having been used for proposing the design values.
Notes: *Ministry of Agriculture, Forestry and Fisheries
**Ministry of Land, Infrastructure, Transport and Tourism