SAFETY AND CONSTRUCTION PRECAUTIONS MAXIMUM ROOF SPANS WARNING MAXIMUM ROOF SPANS FOR NORDIC I-JOISTS MAXIMUM ROOF SPANS FOR NORDIC I-JOISTS I-joists are not stable until completely installed, and will not carry any load until Snow Load = 20 psf, Dead Load = 15 psf Snow Load = 40 psf, Dead Load = 15 psf N-C302/ April 2014 fully braced and sheathed. Slope of 1/4:12 to 4:12 Slope of >4:12 to 8:12 Slope of >8:12 to 12:12 Slope of 1/4:12 to 4:12 Slope of >4:12 to 8:12 Slope of >8:12 to 12:12 Avoid Accidents by Following these Important Guidelines: Joist Joist Joist Joist On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing 1. Brace and nail each I-joist as it is installed, using hangers, blocking panels, Depth Series Depth Series rim board, and/or cross-bridging at joist ends. When I-joists are applied 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" Do not walk on I-joists continuous over interior supports and a load-bearing wall is planned at that until fully fastened and NI-20 20'-4" 18'-5" 16'-0" 19'-1" 17'-3" 15'-0" 17'-7" 15'-11" 13'-10" NI-20 17'-4" 15'-8" 13'-7" 16'-7" 15'-0" 13'-0" 15'-5" 14'-0" 12'-1" location, blocking will be required at the interior support. braced, or serious inju- NI-40x 23'-4" 21'-1" 18'-4" 21'-10" 19'-10" 17'-2" 20'-2" 18'-3" 15'-10" NI-40x 19'-10" 17'-11" 15'-4" 19'-0" 17'-2" 14'-11" 17'-8" 16'-0" 13'-11" 9-1/2" NI-60 23'-9" 21'-6" 18'-8" 22'-4" 20'-2" 17'-6" 20'-7" 18'-7" 16'-2" 9-1/2" NI-60 20'-2" 18'-3" 15'-10" 19'-5" 17'-6" 15'-2" 18'-0" 16'-4" 14'-2" ries can result. 2. When the building is completed, the floor sheathing will provide lateral NI-70 26'-1" 23'-7" 20'-5" 24'-5" 22'-1" 19'-2" 22'-6" 20'-5" 17'-9" NI-70 22'-2" 20'-0" 17'-4" 21'-3" 19'-2" 16'-8" 19'-9" 17'-11" 15'-6" support for the top flanges of the I-joists. Until this sheathing is applied, NI-80 26'-7" 24'-1" 20'-11" 24'-11" 22'-7" 19'-7" 23'-0" 20'-10" 18'-1" NI-80 22'-7" 20'-5" 17'-8" 21'-8" 19'-7" 17'-0" 20'-2" 18'-3" 15'-10" temporary bracing, often called struts, or temporary sheathing must be NI-20 24'-7" 22'-3" 19'-4" 23'-0" 20'-10" 18'-2" 21'-3" 19'-3" 16'-9" NI-20 20'-11" 18'-11" 16'-5" 20'-0" 18'-2" 15'-9" 18'-8" 16'-11" 14'-8" ROOF DETAILS applied to prevent I-joist rollover or buckling. NI-40x 27'-11" 25'-3" 21'-11" 26'-2" 23'-8" 20'-7" 24'-1" 21'-10" 19'-0" NI-40x 23'-9" 21'-5" 17'-6" 22'-9" 20'-7" 17'-2" 21'-2" 19'-2" 16'-8" NI-60 28'-6" 25'-10" 22'-5" 26'-9" 24'-3" 21'-1" 24'-8" 22'-4" 19'-5" NI-60 24'-3" 21'-11" 19'-0" 23'-3" 21'-1" 18'-3" 21'-8" 19'-7" 17'-0" n Temporary bracing or struts must be 1x4 inch minimum, at least 8 feet 11-7/8" NI-70 31'-1" 28'-2" 24'-5" 29'-2" 26'-5" 23'-0" 26'-11" 24'-4" 21'-2" 11-7/8" NI-70 26'-5" 23'-11" 20'-9" 25'-5" 23'-0" 19'-11" 23'-8" 21'-5" 18'-7" FRAMING AND CONSTRUCTION GUIDE long and spaced no more than 8 feet on centre, and must be secured with NI-80 31'-9" 28'-9" 24'-11" 29'-9" 27'-0" 23'-5" 27'-5" 24'-10" 21'-7" NI-80 27'-0" 24'-5" 21'-1" 25'-11" 23'-5" 20'-4" 24'-1" 21'-10" 18'-11" a minimum of two 2-1/2" nails fastened to the top surface of each I-joist. NI-90 32'-9" 29'-8" 25'-9" 30'-9" 27'-10" 24'-2" 28'-4" 25'-8" 22'-4" NI-90 27'-10" 25'-2" 21'-9" 26'-9" 24'-2" 20'-11" 24'-10" 22'-6" 19'-6" Nail the bracing to a lateral restraint at the end of each bay. Lap ends of NI-90x 33'-0" 29'-10" 25'-11" 31'-0" 28'-0" 24'-4" 28'-7" 25'-10" 22'-6" NI-90x 28'-1" 25'-4" 21'-11" 26'-11" 24'-4" 21'-1" 25'-1" 22'-8" 19'-8" adjoining bracing over at least two I-joists. NI-40x 31'-8" 28'-8" 24'-4" 29'-9" 26'-11" 23'-5" 27'-5" 24'-10" 21'-7" NI-40x 26'-11" 23'-7" 19'-2" 25'-10" 23'-2" 18'-10" 24'-1" 21'-9" 18'-5" NI-60 32'-6" 29'-5" 25'-7" 30'-6" 27'-7" 24'-0" 28'-1" 25'-6" 22'-2" NI-60 27'-8" 25'-0" 21'-8" 26'-6" 24'-0" 20'-10" 24'-8" 22'-4" 19'-5" n Or, sheathing (temporary or permanent) can be nailed to the top flange of Never stack building NI-70 35'-4" 32'-0" 27'-9" 33'-1" 30'-0" 26'-1" 30'-6" 27'-8" 24'-1" NI-70 30'-0" 27'-2" 23'-6" 28'-10" 26'-1" 22'-7" 26'-10" 24'-3" 21'-1" materials over the first 4 feet of I-joists at the end of the bay. 14" NI-80 36'-1" 32'-8" 28'-5" 33'-11" 30'-8" 26'-8" 31'-3" 28'-4" 24'-7" 14" NI-80 30'-8" 27'-9" 24'-1" 29'-6" 26'-8" 23'-2" 27'-5" 24'-10" 21'-7" unsheathed I-joists. 3. For cantilevered I-joists, brace top and bottom flanges, and brace ends with NI-90 37'-2" 33'-8" 29'-3" 34'-11" 31'-7" 27'-5" 32'-2" 29'-2" 25'-4" NI-90 31'-7" 28'-7" 24'-9" 30'-4" 27'-6" 23'-10" 28'-3" 25'-7" 22'-2" Once sheathed, do not closure panels, rim board, or cross-bridging. NI-90x 37'-8" 34'-1" 29'-7" 35'-4" 32'-0" 27'-10" 32'-7" 29'-6" 25'-8" NI-90x 32'-0" 28'-11" 25'-1" 30'-9" 27'-10" 24'-1" 28'-7" 25'-11" 22'-6" over-stress I-joist with NI-60 36'-2" 32'-9" 28'-5" 33'-11" 30'-8" 26'-8" 31'-3" 28'-4" 24'-7" NI-60 30'-9" 27'-10" 23'-9" 29'-6" 26'-8" 23'-2" 27'-5" 24'-10" 21'-7" concentrated loads from 4. Install and fully nail permanent sheathing to each I-joist before placing loads NI-70 39'-1" 35'-5" 30'-9" 36'-8" 33'-3" 28'-11" 33'-10" 30'-8" 26'-8" NI-70 33'-3" 30'-1" 25'-9" 31'-11" 28'-11" 25'-1" 29'-9" 26'-11" 23'-4" building materials. on the floor system. Then, stack building materials over beams or walls only. 16" NI-80 40'-1" 36'-3" 31'-6" 37'-7" 34'-1" 29'-7" 34'-8" 31'-5" 27'-4" 16" NI-80 34'-1" 30'-10" 26'-9" 32'-8" 29'-7" 25'-8" 30'-5" 27'-7" 23'-11" NI-90 41'-2" 37'-4" 32'-5" 38'-8" 35'-0" 30'-5" 35'-8" 32'-3" 28'-1" NI-90 35'-0" 31'-8" 27'-5" 33'-7" 30'-5" 26'-5" 31'-4" 28'-4" 24'-7" 5. Never install a damaged I-joist. NI-90x 41'-10" 37'-11" 32'-11" 39'-3" 35'-7" 30'-11" 36'-2" 32'-10" 28'-6" NI-90x 35'-7" 32'-2" 27'-11" 34'-2" 30'-11" 26'-10" 31'-10" 28'-9" 25'-0" Improper storage or installation, failure to follow applicable building codes, failure to follow span ratings for Nordic I-joists, failure to follow allowable hole sizes and locations, or failure to use web stiffeners when required MAXIMUM ROOF SPANS FOR NORDIC I-JOISTS can result in serious accidents. Follow these installation guidelines carefully. MAXIMUM ROOF SPANS FOR NORDIC I-JOISTS Snow Load = 30 psf, Dead Load = 15 psf Snow Load = 50 psf, Dead Load = 15 psf Slope of 1/4:12 to 4:12 Slope of >4:12 to 8:12 Slope of >8:12 to 12:12 Slope of 1/4:12 to 4:12 Slope of >4:12 to 8:12 Slope of >8:12 to 12:12 Joist Joist Joist Joist On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing On Centre Spacing Depth Series Depth Series 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" 12" 16" 24" STORAGE AND HANDLING GUIDELINES NI-20 18'-9" 17'-0" 14'-9" 17'-8" 16'-0" 13'-11" 16'-5" 14'-10" 12'-10" NI-20 16'-0" 14'-6" 12'-6" 15'-4" 13'-11" 12'-0" 14'-7" 13'-2" 11'-5" NI-40x 21'-6" 19'-5" 16'-10" 20'-3" 18'-4" 15'-11" 18'-9" 17'-0" 14'-9" NI-40x 18'-4" 16'-7" 14'-0" 17'-7" 15'-11" 13'-9" 16'-8" 15'-1" 13'-1" 9-1/2" NI-60 21'-11" 19'-10" 17'-2" 20'-8" 18'-8" 16'-3" 19'-2" 17'-4" 15'-0" 9-1/2" NI-60 18'-8" 16'-11" 14'-7" 17'-11" 16'-3" 14'-0" 17'-0" 15'-5" 13'-4" 1.