Southern Forest Products Association Span Tables Span tables for visual and mechanical grades of southern pine lumber joists and rafters, and southern pine lumber and glue-laminated timber (glulam) headers, beams and girders.. Listed spans are for dry-service conditions unless the table is labeled as Wet-Service. Check sources of supply for available grades and sizes, and for lumber longer than 20 feet; an asterisk (*) indicates the listed span has been limited to 26'-0" based on availability.
Pergola Rafter Spans for 600 mm and 900 mm Spacing Wind Classification N1 & N2 Notes: 1) Refer to general notes for information that is relevant for all span tables. 2) For design parameters, refer to figure 7.26. AS1684.2 and 3. 3) Where rafters are equal to or exceed four times their breath, blocking should be used to reduce distortion. Pergola Beam Spands Wind Classification 1 & N2 Notes: 1.. Deck Joist Span Tables Maximum spans for 2x6 through 2x12 joists in Southern Pine and SPF at common spacings, under the 40 PSF live + 10 PSF dead load assumption.