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Several I-joist compatible glulam sections have been added to the glulam balanced and glulam unbalanced database files to make the database correspond to the current NDS Supplement. These sizes are:
Western Species - 3.5 x 9.25, 3.5 x 20, 3.5x 22, 5.5 x 9.25, 5.5 x 20, 5.5 x 22
Southern Pine - 3.5 x 9.25, 3.5x 18, 3.5x 20, 3.5 x 24, 5.5 x 9.25, 5.5 x 18, 5.5x 20, 5.5 x 24.
Extensive changes were made to the MSR and MEL database files to implement changes in the 2015 Supplement Table 4C as compared to the 2012 edition. Note that the changes originally appeared in a 2013 addendum, but are new to the WoodWorks program.
In addition, the program now restricts the materials to those for which there as a least one match between the grading rules agencies listed for the grades in Table 4C and those listed for the species in Table 4C Footnotes. Previously it included all combinations of species and grade, most of which don’t in fact exist.
In a few places, this necessitated the creation of new species designations like Hem-Fir (WCLIB) and S-P-F (S) (0.46) to distinguish between species that have different properties for the same E value when graded by different agencies.
Note that for MEL, this change restricts the database to Southern Pine and those species graded by the Canadian NLGA, which are the only MEL materials in existence.
For sawn timbers, the NDS 2015 specifies that wet section sizes are to be used for design, whereas the NDS 2015 listed dry sizes. For 5"- and 6"-nominal timbers there is no change in size, for 8" to 14" the sizes have increased ¼", e.g. 7-1/4" to 7-1/2", and for 16" to 24" they have increased ½", e.g. 15 to 15-1/2"
These changes originally appeared in a 2013 addendum to the NDS Supplement. Note that the wet sizes were listed in editions of the NDS prior to 2012, so WoodWorks is reverting the sizes to those that were in the program before version 10.
These changes have been made to the major species, other species, and hardwood database files used in Sizer for beams and columns.
The glulam and timber database files are now included for joist design to allow you to more easily design large timbers that are repetitively spaced and subject to uniform area loads.
No attempt was made to cull the section sizes to realistic ones for floor and roof joists, so these database files are recommended to be used primarily when a section size is known rather than design for unknown section size.