• Heavy-duty load rating — Minimum of 16 lbs./LF on main runners – 0.020-inch metal thickness on main runners and cross tees for heavy duty strength – Rotary stitched web for increased stability – 1.6-inch profile height for increased load capacity • Heavy-duty – All system components minimum .018" HDG steel thickness; complies Strength and stiffness are equally important. Building codes provide you with information about required grades, spans, bearing, lateral support, notching, etc. Sheetrock panels are easily installed, though skill is required for taping the joints for a seamless appearance. First you need to get a few things: Code book; AF&PA’s Span Tables for Joists and Rafters (this assigns allowable spans to various combinations of E and Fb); and a copy of Design Values for Joists and Rafters (this has Fb and E values for various species, sizes and grades of dimension lumber). per sq. For example, Appendix A indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf. However, if the attic is intended for storage, the attic live load (or some portion) should also be considered for the design of other elements in the load path. Special fasteners are used to attach weight to Sheetrock. Rafters are sized the same way as joists: Establish live load, dead load and deflection limits; use the appropriate rafter table to determine acceptable Fb and E values; and then select the appropriate species, size and grade from AF&PA’s Design Values for Joists and Rafters publication. E is a ratio that relates the amount a given load causes a material to deform. This sets an allowable first-floor live load of 40 psf, a dead load of 10 psf, and a deflection of L/360. VISUALLY GRADED LUMBER. Allowable limiting heights & spans Contact ClarkDietrich Technical Services at (888) 437-3244 for any questions on tables below. The Drywall Suspension System is available in pre-engineered custom shapes for framing curved drywall ceilings such as vaults, valleys, domes and arches. Or visit their website at http://www.awc.org for more information. With lightweight, all-aluminum construction for easy use, the PRO-SERIES Adjustable Height Drywall Stilts are designed for professionals working with drywall and ceiling installation. Many factors influence how a system responds to loading. per sq. Step 3 Wood Design Values: Now you must select a wood species and grade that meets the required Fb and E values, and that’s available in your area. First, remember that the rafter’s span is not its actual length, but its total horizontal projection (see Figure #6). Using span tables to size joists and rafters is a straight-forward process when you understand the structural principles that govern their use. If you have another floor above your garage, the ceiling\floor structure can usually support up to 40 lbs/SqFt (including the weight of the floor above it). When using the tables to size rafters, there are two points to keep in mind. length from support to support – not the full The load and importance factors are revised in accordance with the requirements of the 2010 National Building Code ... drywall trims and accessories, ceiling grid, ComSlab® composite floor system, and vinyl ... For the web crippling capacity of steel stud flexural members with stud to track connections A 2×12 with an E of 800,000 psi and Fb of 790 psi also works, since it can span 15 feet and 10 inches. To handle 16 inches of … Their design span, the exact length from face to face of the supports, is 15 feet 1 inch (see illustration – Figure #1), When sizing joists, use the clear span – the Hem-fir is a stiffer material. Tension refers to the force required to pull it from the hole. A material with a higher E value is stiffer. The fact that snow loads only act part of the year has been taken into account in the rafter tables, but don’t forget to use the “Snow Loading” column to get the Fb design value. After determining what size lumber to use, turn to the tables in Design Values For Joists and Rafters to select a species and grade that meets the required Fb and E values. If, when the loads of the house are combined, the house weighs more than the soil can support – the house will sink until it reaches a point at which the soil can support the load. All weight hanging from the truss has to be added to the existing dead load; if the total weight exceeds the load limit of the truss, then the truss is compromised. These anchors come in three basic types: sleeve, toggle, and expansion. Fb value or extreme fiber stress in bending. To support 5/8″ gypsum drywall, #2 (not standard & better) grade 2×4 or 2×6 can be placed 24 inches on center supported at each end with 2×4 joist hangers. Step 1 Check The Code: First check the local code for allowable live load, dead load, and deflection (see Figure #2). In spruce-pine-fir, No. 2Attic loads may be included in the floor live load, but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. length of the joist. Values for surfaced dry or surfaced green lumber apply at 19% maximum moisture content in use. (the tables permit a bearing length of up to 3.5 inches, but since 1.5 is probably the worst case that you’ll encounter for joist or rafter bearing, it’s a safe value.) in Building and Construction Technology, Minor in Building and Construction Technology, Graduate Studies: Sustainable Building Systems (M.S. Species of wood. As the table shows, no 2×8’s meet the span and spacing requirements, but a 2×10 with an E of 1,300,000 psi and Fb of 1093 psi can span 15 feet 3 inches – more than enough. The higher the Fb the stronger the wood. The fixture may be manufactured with a supporting frame that spans the correct distance. Planning a new post frame building? A higher grade of a given species has a higher strength rating (Fb) and often has a higher stiffness value (E) too. 5/8” thick gypsum drywall weighs 2.2 psf, 7/16” osb (oriented strand board) 1.47 psf. The ends of these members must be able to “react” or resist these loads without crushing. Let’s work through an example that illustrates the steps involved in using the tables. The tables shown here are excerpts from the hem-fir, Douglas fir-larch, and spruce-pine-fir tables. The Table of contents indicates that Table F-2 watches these loading conditions. UMass Shortcuts: Email Moodle Spire WVD ODB260 Remote Access Online Storage IT Support, Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Pinterest (Opens in new window)Click to[...], Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Pinterest (Opens in new window), The John W. Olver Design Building at UMass Amherst, Design Building Virtual Construction Site Visit, Undergraduate Major: B.S. Larger plastic anchors will accept larger screws and therefore have greater holding capacity. Buy Mount-It! 1. So consider a simple gable roof on a 24-foot wide ranch framed with 2×6 exterior walls and a 1 1/2 ridge: the span would be 11’5 3/4″. We commonly hand electrical panel boxes weight 60 pounds or more to drywall with toggle bolts, but not on your typical 1/2 inch thick residential drywall. Load ratings for tension and shear are specified for drywall anchors and bolts. This sets an allowable first-floor live load of 40 psf, a dead load of 10 psf, and a deflection of L/360. And performance marked or damaged not a load-bearing material able to “ react ” or resist these loads crushing! Other wall and ceiling anchors including relative strengths and limitations Home > Publications > Articles Understanding! The same grade and species 2×8 has a much more extensive offering of joist... Deflects 1/3 '' the ceiling, and rafters are transferred through their points... The tabulated values in direct proportion to the studs behind the gypsum board, transferring the weight to.... And stiff enough to resist these loads without crushing Appendix with span tables: this older article our... 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