![]() ![]() Please contact your representative to determine quantities. Refer to appropriate sections of the Specifier Guide for installation guidelines and construction details.Raft with ceiling no attached on traverses, sanded snow laden 50 Psf, dead load 20 Psf, beam limit L/180. The subfloor must be glued as per APA Specification AFG-01 or ASTM D3498 and nailed as per NDS, ICC IBC/IRC code. The span tables on this page envelope the follows deuce design scenarios: Rafters the ceiling not append to rafters, live load 20 Psf, already load 20 Psf, deflection limit L/180. and is a “24 oc APA rated panel” for joist’s spacing of 24″ o.c. The considered subfloor is a “20 oc APA rated panel” for joist’s spacing of 12″, 16″ and 19.2″ o.c.Example: In the raffle span table below, the highlighted cell (13-0), suggests that 2' x 8' Dublin Fir rafter, with a grade by 2, spaced 24' apart, can have a maximum range regarding 13 feet - 0 inches (13-0) if designed for one live load of 20 psf, and dead load of 20. The indicated spans are based on the Allowable Stress Design method as per NDS, ICC IBC/IRC code. Maximal Spans for Floor Joists Universal Cases.Live Load deflection is limited to L/480.Total Load deflection is limited to L/240.Maximum spans are measured centerline to centerline of bearing and are based on uniformly loaded joists.Minimum end bearing length is 1½”, spans in bold require web stiffeners at OSB end panel.Table R502.3.1(1) shall be used to determine the maximum allowable span of floor joists that support sleeping areas and attics that are accessed by means of a fixed stairway in accordance with Section R311.7 provided that the design live load does not exceed 30 pounds per square foot (1. The indicated spans are based on simple span joists. R502.3.1 Sleeping areas and attic joists.Extra blocking will be required.įor more information such as proper connections and bracing contact tech support.Live load: 100 psf / Dead Load: 15 psf / Depth: 16″ – Span table Live load Ripper Strips on TJI® Joist Top Flange: Rip dimensional lumber diagonally to the desired slope and fasten to the top flange of the TJI® joist with nails or Simpson Strong-Tie® Ripper Clips. The span tables with this front cover the following two design scenarios: Rafters with ceiling not attached to rafters, live load 20 psf, dead load 20 psf, deflection max L/180. Contact insulation manufacturer for thermal and installation information. Tapered Rigid Insulation: Often seen on large scale projects, tapered rigid insulation can be used to create minimum slope on top of a TJI® joist roof system. Taper Cut Trus Joist Structural Composite Lumber: A designer of record may specify 1- 3/4" (or wider) TimberStrand® LSL, Microllam® LVL, or Parallam® PSL roof joists to be field modified with a taper cut. Raised Bearing: At one end of the joist raise the plate height and add a vertical 2x to the side of the TJI bottom flange to provide a flat ceiling surface.To achieve a minimum 1/4" per foot of slope, bearing wall elevations need to be raised the thickness of a 2x plate for every 6 foot of joist span. Weyerhaeuser suggests the following variations for creating slope with Trus Joist products. It is the responsibility of the designer of record to address items like ponding, snow/drift loads, lateral loads, wind loads, bracing, ventilation, and insulation when adding a slope to roofs. The International Residential Code (IRC) states that roofs must have a minimum of 1/4:12 slope that allows water to drain properly (Chapter 9)įlat Roofs with a slight slope can be achieved using Trus Joist® TJI® joists and solid section products. ![]() When designing and installing a flat roof, it is essential to provide for drainage to avoid leakage problems and pooling water on roofs. ![]()
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