![]() ![]() Those using this on-line calculator assume all liability and hold PLIB harmless from its use. Appendix B Tables of Maximum Allowable Spans For Wood Floor Joists, Ceiling Joists, Roof. Dense elect Structural Select Structural NonDense Structural No.1 Dense No.1 NonDense No. Table 1 Floor Joists 30 psf live load, 10 psf dead load, 360 deflection. Neither PLIB nor its members assume any responsibility for any particular design prepared from this on-line calculator. of Visually Graded Southern Pine Dimension Lumber Maximum spans in feet-inches. 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. If the re-engineering is correct, the floors and roof will be fine with SPF. SPF cannot span the same distance as SYP, so you must have closer spacing, larger sized pieces (2x10 instead of 2x8, for example), etc. If it is for joists and rafters, big difference. 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. If it is for the studs in the walls, no problem. ![]() ![]() 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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