Rafter span table

Rafter spans for Southern Yellow Pine, Douglas Fir, and Eastern Spruce. To increase the use of wood by assuring the broad regulatory acceptance of wood products, developing design tools and guidelines for wood construction, and influencing the development of public policies affecting the use and manufacture of wood products. Listed are tables based on common loading conditions for floor joists, ceiling joists and rafters.

Ceiling Joist Span Use this table to determine the maximum lengths of ceiling joists based on species of lumber, joist spacing, and joist size. The spans in this table are based on a maximum supported rafter span of feet, where the supported span is the total horizontal distance spanned by the roof rafters divided in half (NOT the diagonal distance or the length of the rafter ). Allowable ceiling joist spans. This is based upon the span of the rafter (horizontal span , not total rafter length), live and dead loads. This Rafter Span Calculator is species specific for Douglas Fir, hemlock, etc. For sloping rafters , the span is also measured along the horizontal projection.

Notes: 1) Refer to general notes for information that is relevant for all span tables. For design parameters, refer to figure 7. Where rafters are equal to or exceed four times their breath, blocking should be used to reduce distortion. NorthPointe Executive Drive.

Obtain Rafter Run: Measure or calculate the horizontal distance the rafter will span. TIMBER QUEENSLAND LIMITED TECHNICAL DATA SHEET PERGOLAS AND CARPORTS. Pitched roof timber sizes. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.

Loads are calculated in accordance with Table 3. Tables 2L and 2H list the sizes and spans for. Live load point load kN The imposed point live load that can occur anywhere on the span or the overhang. SPAN TABLES - These span tables have been developed in good faith, with the assistance of Mr. A span is the distance between two intermediate supports for a structure.

Span tables are used to size joists and rafters. Proper use of a span table is an important step in quality construction. Web crippling capacity is based on a minimum bearing length of 3. The tables below give maximum spans for rafters and beams. The figures are based on quality materials.

For lesser grades, spans should be shorter. Keep in mind that these are maximums—in other words, shortening spans slightly will result in a more solid structure. Morning all, I can find joist and rafter span tables for x X lumber (2x 2x etc.). Are there tabels for four-by lumber?

My roof design requires me to put in 2xon centers and am wondering if I can get cute and do 4xon longer centers. Select slope factor for given slope in table. Multiply Horizontal Span by Slope Factor. Low and Medium’ and ‘High and Very High’ wind zones.

Rafters or Roofing Purlins (House, Pergola or Deck). Step – Continuous rafter increase Table 10. For other conditions such as concentrated loads, unequal spans , etc.

LP SolidStart Engineered Wood Products distributor. Roof pitch is absolutely relevant to Code rafter span tables. For example, the International Residential Code in section R802. The final authority in building codes, including rafter spans , lies with the building inspector in your local area. Manufacturer of steel framing components and accessories providing comprehensive engineering services through all phases of the design and construction process.

Spans are limited to feet. This Performance Standard provides an easy-to-use table of allowable spans for applications in residential floor construction, allowing designers and builders to select and use I-joists from various member manufacturers using just one set of span tables. Horizontal Design Span (center-to-center)-to-center) VL Depth L=Lh x Slope.

When the maximum span is used the dynamic deflection may be more than desired. Please take this into consideration when specifying. American Wood Council – Offers a range of span tables. APA – Provides span tables for APA structural use panels.

The span tables apply to joists or rafters supporting uniform loads and one or two rows of PV panels set at the midspan of the member. Southern Pine Council – Provides a range of span tables for southern pine joists and rafters. For joists or rafters on roofs with a slope of inches per foot or less, the maximum span is based upon the members acting as simple span elements. For other grades and species and for other loading conditions, refer to the AWC STJR.

The span of each rafter shall be measured along the horizontal projection of the rafter. Ground snow loads must be converted to design snow loads for roofs in accordance with appropriate building code provisions before using the tables.