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- WOOD I BEAM™ JOISTS
WOOD I BEAM™ JOISTS
WOOD I BEAM™ JOISTS
Wood I Beam™ Joists are engineered for consistent stiffness and strength, featuring enhanced OSB webs and options for solid sawn lumber or laminated veneer lumber (LVL) flanges. They are designed to resist shrinking and twisting, minimizing floor squeaks and reducing callbacks.
Floor and roof systems prioritize user safety and satisfaction, meeting or exceeding minimum code criteria. Deflection limits (e.g., L/360, L/240, L/180) are crucial for performance, with a stiffer floor achieved at L/480. Proper installation, including plumb and securely anchored joists, is essential.
- Use glue and nails for subfloor attachment to increase stiffness.
- Ensure joists are plumb and securely anchored before attaching system sheathing.
- Consider additional measures to dampen vibrations, such as gypsum wallboard ceilings or x-bridging.
- Glued and nailed floor sheathing.
- Deflection limits: L/240 total load, L/480 live load.
- Roof loads: 30 PSF live load, 12 PSF dead load.
- Floor live load: 40 PSF.
Span tables provide maximum spans for various joist series and depths, based on uniform loads and glued-nailed APA Rated® sheathing.
- Minimum end bearing length is 1 3/4 inches.
- For multiple-span joists, end spans must be at least 40% of the adjacent span.
- For conditions not covered, use FASTBeam® software or contact Georgia-Pacific Technical Services.
Weights for various flooring materials are provided, such as hardwood flooring at 4.0 PSF and ceramic tile at 10.0 PSF. Concrete floor fill weights are also detailed.
Weights for framing materials and walls are specified, with 2x4 framing at 1.4 PSF and gypsum board walls at 8.0 PSF per side.
Rigid insulation weighs 1.5 PSF, and batts weigh 0.5 PSF per inch of thickness.
Miscellaneous dead loads should be between 1.0-2.0 PSF.
Conversion tables for PSF to PLF and spacing factors for different joist spacings are provided.
Wood I Beam™ joists should be stored off the ground, protected from weather, and handled carefully to prevent damage.
Personal protective equipment is recommended for handlers and installers. Joists must be properly installed and braced to support loads.
- HT angles to joists must be fastened with a minimum of two 8d nails.
- Bracing should be at least 1x4 and 88 long with on-center spacing not exceeding 108.
- Improper storage or installation can result in serious accidents.
- Joists should not be loaded or walked on until properly installed and braced.
- Engineered lumber must not be in direct contact with concrete or masonry.
- Top and bottom flanges of joists should not be cut, drilled, or notched except for specific cuts.
- Do not violate hole table rules.
- Do not support joists by the top flange or web.
- Minimum end bearing length at all floor and roof details is 1 3/4 inches.
- Use 8d nails at 6 inches o.c. for shear transfer.
- For stair stringers longer than 14 feet or reactions greater than 700 lbs., consult Georgia-Pacific.
All posts must be solidly blocked to the bearing below using an equal number of squash blocks. Stiffeners are necessary for concentrated loads exceeding 1500 lbs.
Face mount hangers can be substituted with properly fastened solid wood blocking of the steel beam.
Specific reinforcement requirements are outlined based on load conditions, with cantilever lengths not exceeding 1/4 of the adjacent span.
Various roof loading scenarios are detailed, with specific joist spacing and reinforcement requirements.
Wood I Beams are intended for dry use and should be protected from weather.
- Allowable Moment and Shear: Values are for normal duration loading and can be increased for other load durations as per code.
- End Reaction: Based on a minimum bearing length of 1 3/4 inches without stiffeners.
Detailed tables provide allowable moment, shear, end, and intermediate reactions for various joist series and depths.
Guidelines for joist spacing below plumbing walls are provided.
- Description: Covers prefabricated Wood I Beam™ joists for ceilings, floors, and roofs.
- Submittals: Requires product data and shop drawings for installation details.
- Prefabricated Joists: Lists acceptable products and their characteristics.
- Installation: Instructions for installing and bracing joists to prevent system failure.
- Georgia-Pacific engineered lumber products come with a lifetime limited warranty.
- Products are certified for resource efficiency and indoor environmental quality.
Catalog excerpts
WOOD I BEAM™ JOISTS GEORGIA-PACIFIC WOOD PRODUCTS ENGINEERED LUMBER RESIDENTIAL GUI
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Wood I Beam™ Joist features and benefits ■ ■ ■ ■ ■ Engineered to deliver consistent stiffness and strength characteristics Dimensional stability helps minimize floor squeaks and helps reduce callbacks Resists shrinking and twisting for less waste and more consistent performance Available with solid sawn lumber or laminated veneer lumber (LVL) flanges Available in value lengths from 208 to 488 (lengths up to 608 by special order) WI Series (Lumber Flanges) All Wood I Beam joists have an enhanced OSB web. Referenced dimensions are nominal and used for design purposes. Not all products are available...
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Floor Joist Maximum Spans Span Illustrations Simple Span 1 . These span tables are based on uniform loads, as noted above; live load deflection is limited to L/480 for better performance. Floor performance is greatly influenced by the stiffness of the floor joists . Experience has shown that joists designed to the code minimum live load deflection (L/360) will result in a floor which may not meet the expectations of some end users . Floor systems stiffer than L/480 may be desired . 2 . Spans are clear distances between supports, and are based on composite action with glued-nailed APA Rated ®...
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Bonus Room Floor Joist Selection Guide L (Span) 208 WI Joists (Series –Depth)1 SpacinG GPI Joists (Series – Depth)1 Spacing 1 . Double joist (2-ply) is denoted by “Dbl” . Both joists must be glued and nailed as required for floor sheathing . No filler blocking required when top-loaded only . 2 . A 21⁄ 29 minimum bearing length must be provided by support wall or hanger seat . 3 . A 39 minimum bearing length must be provided by support wall or hanger seat . 4 . To be used in this application, the joist requires bearing stiffeners at both ends per detail F18 . Design Parameters: 2X roof and wall...
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Roof Joist Maximum Spans NOTES: 1 . Roof joists to be sloped min . 1⁄49 in 129 . No camber provided . 2 . Maximum deflection is limited to L/180 at total load, L/240 at live load . 3 . Maximum slope is limited to 129 in 129 for use of these tables . 4 . Tables are based on the more restrictive of simple or multiple spans . 5 . End spans of multiple-span joists must be at least 40% of the adjacent span . 6 . For other loading conditions or on-center spacings, refer to Uniform Load Tables or use FASTBeam ® selection software . 7 . Minimum end bearing length is 13 ⁄49 . Minimum intermediate bearing...
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Roof Joist Maximum Spans – 115% (Snow) continued Refer to Notes on page 8 . Load (PSF) Joist Series Joist Depth SNOW 115% Live 40 Dead 15 SNOW 115% Live 50 Dead 15 ENGINEERED LUMBER RESIDENTIAL GUIDE GEORGIA-PACIFIC WOOD PRODUCTS
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Roof Joist Maximum Spans – 125% (Non-Snow) Refer to Notes on page 8 . Load (PSF) Non-SNOW 125% Live 20 Dead 10 Non-SNOW 125% Live 20 Dead 15 Non-SNOW 125% Live 20 Dead 20 GEORGIA-PACIFIC WOOD PRODUCTS
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Dead Load Material Weights Pounds per square foot (PSF) Material PSF Sheathing and Decking 11 ⁄329 Plytanium® Plywood . . . . . . . . . . . . . . . 1.1 15 ⁄329 Plytanium Plywood . . . . . . . . . . . . . . . . 1.5 19 ⁄329 Plytanium Plywood . . . . . . . . . . . . . . . . 1.8 23 ⁄329 Plytanium Plywood . . . . . . . . . . . . . . . . 2.2 7 ⁄89 Plytanium Plywood . . . . . . . . . . . . . . . . 2.6 11⁄89 Plytanium Plywood. . . . . . . . . . . . . . . . . 3.4 3 ⁄89 OSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 7 ⁄169 OSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
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Allowable Uniform Floor Loads (PLF) Joist Series Depth Joist Span: Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total Live Total 1 . Refer to General Notes on page 11 . 2 . L/480 live load deflection is recommended (See System Performance on page 5 .) For L/360 (minimum code deflection) multiply L/480 value times 1 .33 . GEORGIA-PACIFIC WOOD PRODUCTS 3 . Total load deflection is limited to L/240 . ENGINEERED LUMBER RESIDENTIAL...
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Allowable Uniform Roof Loads (PLF) Joist Series Depth Joist Span: 1 . Refer to General Notes on page 11 . 2 . All roof joists to be sloped 1⁄49 in 129 minimum . 3 . Use of this table for horizontal spans should be limited to roof slopes of 29 per foot or less . For greater slopes, convert horizontal span to up-the-slope span using the table on page 14 . 4 . Total load deflection is limited to L/180 . For less deflection use the L/240 row . 5 . Table applies to gravity loads only . ENGINEERED LUMBER RESIDENTIAL GUIDE GEORGIA-PACIFIC WOOD PRODUCTS
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Up-the-Slope Spans & Cutting Lengths for Sloped Roofs Joist Depth 91⁄29 Slope Factor When using the uniform load table for roofs with slopes greater than 2( per foot, substitute the up-the-slope-span in the table on page 13 . Horizontal Span Lh EXAMPLE: 7/12 slope and 208-09 horizontal span, 28-0 9 overhang (horizontal) one end, 2x4 walls Up-the-slope span: 208 x 1 .158 = 23 .168 — use 248 joist span column to check load capacity . Overall length: Lh = 28 + 3 .5 9/12 + 208 + 3 .59/12 = 22 .5838 If a 149 joist will be used, Lp = 0 .681 feet L = (22 .5838x 1 .158) + 0 .6818 = 26 .8328 = 268-109...
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Installation Notes A. Engineered lumber must not be installed in direct contact with concrete or masonry construction per code and shall be used in covered, dry-use conditions only (moisture content less than 16%). B. Except for cutting to length and birdsmouth cuts, top and bottom flanges of Wood I Beam™ joists shall not be cut, drilled or notched. C. Concentrated loads shall only be applied to the upper surface of the top flange, not suspended from the bottom flange. Contact Georgia-Pacific for exceptions. D. When nailing to the wide face of the flange surface, maintain spacing in the ranges...
Open the catalog to page 12All Georgia Pacific catalogs and technical brochures
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