Those using this on-line calculator assume all liability and hold PLIB harmless from its use. Neither PLIB nor its members assume any responsibility for any particular design prepared from this on-line calculator. The first span table is for roofs where the ceiling is not attached to the rafters (with no snow load), a live load of 20 Psf, a dead load of 20 Psf, and a deflection limit of L/180. PLIB believes the information generated by this calculator is accurate and conforms with design standards referenced by U.S. The span tables are intended to be used by designers or builders to select the appropriate sizes of Hyspan for members used in the framing of houses and similar buildings. 3) For design parameters, refer to figure 6.22, AS1684.2 and 3. Member span is not suitable for rafter spacing greater than 600mm. You mention a truss span table, while talking about rafters. Notes: 1) Refer to general notes for information that is relevant for all span tables. 17 and/or the National Design Specification (NDS) Supplement published by the American Wood Council for adjustment factors. Span Table for Mono Pitch Roof Construction. For other service conditions or load conditions, see paragraph 200 a-l in WCLB Standard No. 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).
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