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HomeMy WebLinkAboutLedger1.50" minimum to loaded edge 1.50" minimum to loaded edge1.50" minimum to loaded edge 0.75" minimum to unloaded edge 0.75" minimum to unloaded edge 0.75" minimum to unloaded edge 2x10 Detail 2x12 Detail2x6 Detail 0.75" minimum to unloaded edge 2x8 Detail 1.50" minimum to loaded edge 2x6 2 520 455 2x8 or 2x10 3 860 750 2x12 4 1040 900 1) Zinc = Yellow Zinc Dichromate; EXT = Exterior Coat. 2) Allowable Loads are based on DF or equivalent wood members with a specific gravity ≥ 0.50, or SPF/HF members with specific gravity in the following range: 0.42 < SG < 0.50. 3) Gypsum board must be attached per building code requirements. 4) Screws must be installed in the center of the 2x stud, with a tolerance of 3/16" to either side. Minimum loaded end distance for the stud is 3" and 6" when loaded away from the end. Ledger end distance must be 6" or greater for full values. For ledger end distances between 2" and 6" use 50% of the load table, for end distance between 2" and 4" predrill with a 5/32" bit. 5) The values above can be used when designing a ledger connection with (1) or (2)layers of 5/8" gypsum board, a direct connection with no gypsum between the ledger and studs, or a ledger connection with a single layer of APA rated 1/2" OSB. 6) Allowable loads are shown above at a load duration factor of CD = 1.00. Loads may be increased where applicable to the current NDS. When in-service moisture content is greater than 19%, use CM = 0.70. 7) For LRFD values, the values above should be adjusted in accordance with the 2018 NDS, Section 11.3. 8) Main members (stud) shall be loaded parallel to grain with a minimum penetration of 2-1/4" while side members (ledger) shall be loaded perpendicular to grain with a minimum penetration of 1-1/2". WSWH45 WSWH5 EXT Finish1 WSWH45-EXT WSWH5-EXT MiTek Stock No.Allowable Shear Per Stud (Lbs.)2,5,6,7 DF/SP SG ≥ 0.50 S-P-F/HF 0.42 ≤ SG < 0.50 Ledger Size9 Number of Screws per Stud4,8 Zinc Finish1 Attaching Ledger-to-Studs with One or Two Layers of 5/8" Gypsum Wallboard Technical Bulletin MiTek's WSWH Washer Head Structural Wood Screw can be used to attach a ledger to studs directly, through 1/2" APA rated sheathing or through one or two layers of 5/8" gypsum wallboard (drywall). Screws are to be installed into the wide face of the single 2x ledger, through the gypsum board and into the center of the narrow face of the 2x stud. Installation: • Ledger design to be performed by a certified design professional. • Locate studs in wall where ledger is to be installed. • Install WSWH5 screws through ledger and 5/8" gypsum wallboard into wall framing using a T30* drive. • Follow the minimum edge distance guidelines in images shown below. • Wall design must be performed by certified design professional. • Care should be taken to install the ledger only where studs are plumb and free of any defects. • WSWH45 should be used when no gypsum wallboard is present.Typical 2x8 Ledger attached through 2 layers of 5/8" Gypsum Wallboard installation Stud Wall 2 Layers of 5/8" Gypsum Wallboard WSWH5 Screws 3 per stud 2x8 Ledger WSWH Washer Head Interior Structural Wood Screw Application WSWH5 (Yellow Zinc finish) WSWH45 (Exterior Coat finish) 5"4-1/2" * T30 is a trademark of Acument MiTek-US.com Customer Service & Technical Assistance Phone: 1-800-328-5934 • Fax: 1-952-898-8605 • Email: USPcustomerservice@mii.com April 2020 USP #2507 Copyright © 2020 MiTek Industries, Inc. All Rights Reserved2020