![]() 3) For design parameters, refer to figure 6.22, AS1684.2 and 3. Member span is not suitable for rafter spacing greater than 600mm. Those using this on-line calculator assume all liability and hold PLIB harmless from its use. Notes: 1) Refer to general notes for information that is relevant for all span tables. Neither PLIB nor its members assume any responsibility for any particular design prepared from this on-line calculator. PLIB believes the information generated by this calculator is accurate and conforms with design standards referenced by U.S. Design values for Western softwood structural lumber are computed in accordance with ASTM standards based on clear-wood tests or on tests of full-size pieces in specific grades, conducted in cooperation with the USDA Forest Products Laboratory. 17 and/or the National Design Specification (NDS) Supplement published by the American Wood Council for adjustment factors. ![]() ![]() For other service conditions or load conditions, see paragraph 200 a-l in WCLB Standard No. Depending on various factors, a 2×4 floor or deck joist can span a maximum of 6’ 7 at 16 spacing or 7’11 at 12 spacing. 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. 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).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |