Flat Roof Framing Spans

1 psf lb f ft 2 47 88 n m 2.

Flat roof framing spans.

R cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters. Live load is weight of furniture wind snow and more. 2 are indicated below. Allowable spans for df 2 headers for exterior bearing walls max.

Check sources for ava ilability of lumber in lengths greater than 20 feet. 1 ft 0 3048 m. 25 psf max live load 20 psf t r602 7 1 allowable spans for df 2 headers for exterior bearing walls max. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Spacing inches dl 15 psf dl 25 psf ll 20 psf ll 20 psf 4 x 4. Dead load weight of structure and fixed loads 15 lbs ft 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

Allowable spans for open beam ceilings 1 2 7 lumber grade lightweight roofing tile roofing douglas fir larch no 2 or better nominal size inches o c. Attached flat roof 1ao page14. Span calculator for wood joists and rafters also available for the android os. 25 psf max live load 40 psf roof limited storage attic t r602 7 1 size 20 ft building width nj 28 ft building width nj.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Also available for the android os. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

Span exceeds 26 feet in length. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc as a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24.