![]() Principal rafters: Principal rafters are the longest rafters on any roof.However, the roof may include various other rafter types depending on the shape and type. The principal rafter and common rafters are the main rafter types. Roof rafters work alongside roof joists, purlins, and roof truss members, especially the top and bottom chords, webs, and chords, to form the complete roof frame. Traditionally known as stick framing, they are critical framing elements without which the roof comes apart. Rafters are the vertical roof frame members running from the ridge to the wall plate, downslope perimeter, or roof eave. However, hardwoods like oak are wonderful options for heavy-load applications. Moreover, all three are resistant to water and weather elements. The three softwoods provide hard, strong, and durable timber. This applies to both on-site and pre-fabricated roof trusses. Pine, spruce, and Douglas fir are the most common roof rafter materials. So, this guide explains what makes good rafter lumber and explores the best wood types for roof rafters. Moreover, wood is energy-efficient, readily available, and more cost-effective than alternative materials like steel. Timber trusses are strong, durable, and beautiful. Maximum floor span o.c.More than 90% of residential roof trusses are made of wood. Live load: 40 psf / Dead Load: 36 psf / Depth: 11 7/8″ – Span table Live load Live load: 40 psf / Dead Load: 15 psf / Depth: 16″ – Span table Live load Live load: 40 psf / Dead Load: 15 psf / Depth: 14″ – Span table Live load Live load: 40 psf / Dead Load: 15 psf / Depth: 11 7/8″ – Span table Live load Live load: 100 psf / Dead Load: 15 psf / Depth: 16″ – span table.Live load: 100 psf / Dead Load: 15 psf / Depth: 14″ – span table.Live load: 100 psf / Dead Load: 15 psf / Depth: 11 7/8″ – span table.Live load: 40 psf / Dead Load: 36 psf / Depth: 16″ – span table.Live load: 40 psf / Dead Load: 36 psf / Depth: 14″ – span table.Live load: 40 psf / Dead Load: 36 psf / Depth: 11 7/8″ – span table.Live load: 40 psf / Dead Load: 15 psf / Depth: 16″ – span table.Live load: 40 psf / Dead Load: 15 psf / Depth: 14″ – span table.Live load: 40 psf / Dead Load: 15 psf / Depth: 11 7/8″ – span table.ΔL ≤ L/360 Span tables menu (Canadian Edition): ![]() Glued & Nailed Subfloor with strongbacks / ceiling optional Maximum Allowable Spans – Canadian Edition Please contact your representative to determine quantities. Refer to appropriate sections of the Specifier Guide for installation guidelines and construction details. ![]() The subfloor must be glued as per APA Specification AFG-01 or ASTM D3498 and nailed as per NDS, ICC IBC/IRC code. and is a “24 oc APA rated panel” for joist’s spacing of 24″ o.c.
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