For all other situations click here for quick reference in the code book. applications according to the 2018 International Residential Code. Maximum floor joist spans for the SPECIES AND GRADE Southern Pine to read as follows.
FIGURE R802.5.1 BRACED RAFTER CONSTRUCTION TABLE R802.5.These rafter span tables provide the best reference to quickly and easily determine the maximum span for all grades of southern pine according to the 2018 International Residential Code. Pergola Rafter Spans for 600 mm and 900 mm Spacing - (Wind Classification N1 & N2). Exception 2: The following table titled Codes Reference Guide. H R = Height of roof ridge measured vertically above the top of the rafter support walls. H C = Height of ceiling joists or rafter ties measured vertically above the top of the rafter support walls. Note: Where ceiling joist s run perpendicular to the rafter, rafter ties shall be installed in accordance with Section R802.3.1.
Rafter span chart pdf#
For other grades and species and for other loading conditions, refer to the AWC STJR. Description: Featuring Trus Joist® TJI® Joists for Floor and Roof Applications Document ID : tj-4000 File Type: pdf File Size: 5. Rafter spans shall be measured along the horizontal projection of the rafter.
(Uninhabitable attics with limited storage, live load = 20 psf, L/Δ = 240) CEILING JOIST SPACING (inches)įor SI: 1 inch = 25.4 mm, 1 foot = 305 mm, 1 degree = 0.018 rad. Rafters shall be sized based on the rafter spans in Tables R802.4.1(1) through R802.4.1(8). A pair of rafters is called a couple.In home construction, rafters are normally made of wood.
Rafter span chart series#
Before you can determine the maximum spans for joists and rafters, you must know the load requirements for your given area. A rafter is one of a series of sloped structural members such as wooden beams that extend from the ridge or hip to the wall plate, downslope perimeter or eave, and that are designed to support the roof shingles, roof deck and its associated loads. To access printing capabilities, please subscribe to a Digital Codes Premium subscription. Printing is a feature of Digital Codes Premium. (Uninhabitable attics without storage, live load= 10 psf, L/Δ = 240) CEILING JOIST SPACING (inches)Ĭheck sources for availability of lumber in lengths greater than 20 feet.įor SI: 1 inch= 25.4 mm, 1 foot= 304.8 mm, 1 pound per square foot= 0.0479 kPa.Ī. Rafter Span Tables - Use these tables to determine the maximum span of a rafter, given the size, spacing, species and grade of lumber. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. But generally rafter spaced typically either 12, 16 or 24 inches apart in one of several industry -standard increments. Shall be in accordance with Tables R802.4(1) and R802.4(2).įor other grades and species and for other loading conditions,ĬEILING JOIST SPANS FOR COMMON LUMBER SPECIES Roof Rafter Spacing: 12 inches Species and Grade: Douglas fir-larch 2 Dead load: 10 psf Lumber Size used: 2×6 Now lets find the maximum allowable span for a 2×6 member given the above scenario: Therefore given the above example, the maximum allowable span for a 2×6 member is 15-6. There is no any standard rafter spacing measurements.
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