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For header spans, see Tables R602.7(1), R602.7(2) and R602.7(3). TABLE R602.7(1) GIRDER SPANS a AND HEADER SPANS a FOR EXTERIOR BEARING WALLS (Maximum spans for Douglas fir-larch, hem-fir, Southern pine and spruce-pine-fir b and required number of jack studs)
Tables R602.7 (1) and R602.7 (2) of the code are used to determine allowable spans for headers as well as girders. These tables are applicable to openings in bearing walls but are not applicable to nonbearing walls. See Section R602.7.4 for headers in nonbearing walls.
The International Residential Code (IRC) has specific installation notes and details for laterally bracing residential structures. Portal frames are one of the bracing techniques specified, utilizing the garage door header as a component.
Determine the minimum size and bearing support requirements for a #2 Douglas fi r-larch header in an exterior bearing wall as shown in Figure 6-21. Th e width of the building is 28 feet, the header span is 7 feet, and the snow load is 30 psf. Refer to Table 6-5 and Figure 6-21.
7 Ιαν 2016 · An easier solution would be to look up the prescriptive spans from Table R502.5 in the IRC, which can be found free online at codes.iccsafe.org. Or you can use software, some of which is free (Forte by Trus Joist , for example, lets you design using its engineered products, but with the option of using dimensional lumber as well).
SHADED AREAS: 41⁄2" BEARING AT BOTH ENDS AND 111⁄4" BEARING AT INTERMEDIATE 6" BEARING AT BOTH ENDS AND 15" BEARING AT INTERMEDIATE. 71⁄2"BEARING AT BOTH ENDS AND 183⁄4" BEARING AT INTERMEDIATE REFER TO STEEL CONNECTIONS FOR WOOD STRUCTURES PRODUCT.
19 Ιουν 2023 · Based on this table: Source: SouthernPine.com 5-page PDF with all tables. I believe I can safely use any of the following: 2 @ 2x12 at #1 grade; 3 @ 2x10 at #2 grade; 1 @ 3-1/2 x 9-1/4" Gluelam/LVL; Am I reading this table correctly? For my clear span 8' opening, I'd add an extra 6" so it can be supported on doubled 2x4 jack studs at each end.
