Design Value Comparison

Instructions:

1. Select a grade.
2. Choose one or more species/species grouping(s). If desired, filter the species list by selecting NA for North American species only or EU for European species only. The default ALL is a combined list of both NA and EU species.
3. Select one or more region(s)/country(ies).
4. When satisfied with the information included on the Stamp, click “Add Stamp”.
5. Repeat until desired number of Stamps have been added.
6. If desired, choose the preferred Wood Size in the Design Value Comparison section. The default is to provide Base Values.

Design values for each Stamp created will appear in tabular format, with the lowest value for each engineering term highlighted.

The Design Value Comparison calculator can be used to compare design values associated with each individual Stamp (or grade/species/region combination) you’ve created. It will also determine the applicable design values for the set of selected Stamps as a whole. The applicable value for each engineering property is the lowest value (highlighted) among all grades/species/regions included in the set selected.

Note: The design values shown in the table are for normal load duration and dry service conditions and are applicable to lumber surfaced either unseasoned (S-GRN) or dry (S-DRY or KD). In calculating the design values, the change in strength and stiffness that occurs as lumber dries has been taken into consideration as well as the reducing in size that occurs when unseasoned lumber shrinks. For other service conditions or load conditions, see paragraph 200 a-l in WCLB Standard No. 17 and/or the National Design Specification (NDS) Supplement published by the American Wood Council for adjustment factors.