Those using this on-line calculator assume all liability and hold PLIB harmless from its use. Multiply the span given by the multiplier for the wind zone (low and medium 1.3) or (high and very high 1.1) to calculate the extended span for the wind zone chosen. Neither PLIB nor its members assume any responsibility for any particular design prepared from this on-line calculator. Choose the rafter size and the spacing intended and read off the permitted span. PLIB believes the information generated by this calculator is accurate and conforms with design standards referenced by U.S. 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. 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. The tabulated rafter spans assume that ceiling joists are located at the bottom of the attic space or that some other method of resisting the outward push of the rafters on the bearing walls, such as rafter ties, is provided at that location. The tables also provide information on the minimum. Depending on the type of timber being used, the span will vary. The tables provide detailed information on the maximum rafter length that can be safely used in a given application. 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). The Mgp10 Rafter Span Tables are essential for any builder or professional working with timber in Australia.
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