ROOF SYSTEM DESIGN GUIDE - Weyerhaeuser

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ROOF SYSTEMDESIGN GUIDEFeaturing Trus Joist TimberStrand LSL, Microllam LVL, and Parallam PSL Long-Length Rafters with Consistent Strength and Stability Engineered Solutions for Complex Roof Systems Quality Products that Speed Up Construction Promotes Flat Roofs, Crisp Ridge Lines, and Smooth Cathedral Ceilings Limited Product Warranty#TJ-9005 SPECIFIER S GUIDE2Trus Joist Roof SYSTEM DESIGN GUIDE TJ-9005 | January 2020The products in this GUIDE are readily available through our nationwide network of distributors and dealers. For more information on other applications or other Trus Joist products, contact your Weyerhaeuser OF CONTENTSCode Evaluations: See ICC-ES ESR-1387General Assumptions 2Design Properties 3Ceiling Joist Span Table 3Rafter Span and Heel Connection Tables 4 7Hip and Valley Span Tables 8 9Cut Length Calculation 9Hip and Valley Reaction Tables 10Post Allowable Loads 11Multiple-Member Connections 11Rafter, Hip, and Valley Allowable Holes 11Typical Roof SYSTEM 12Roof Framing Details 12 14Framing Connectors 14Design Example 15GENERAL ASSUMPTIONS Technical information in this GUIDE is based on the following assumptions: Roof slopes from 4:12 to 12:12.

3. Scan down the appropriate Design Load column until you find a cell (within your on-center spacing) that meets or exceeds the span of your application. 4. Select the TimberStrand® LSL joist depth. General Notes Table is based on: – Deflection criteria of L/360 live load and L/240 total load. – Uniform loads. – 100% load duration.

  Design, Load, Design loads