SUGGESTED ARCHITECTURAL SPECIFICATIONS
FABRICATED WOOD TRUSSES - SECTION 06192
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PREFABRICATED METAL PLATE CONNECTED WOOD TRUSSES

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  1.01 Work Included

  1. Fabricate, supply and erect wood trusses as shown on the drawings and as specified. Work to include anchorage, blocking, curbing, miscellaneous framing and bracing.

 1.02 Definitions

  1.  TRUSS: The terms "truss" and "wood truss component" refer to open web load carrying assemblies suitable for support of roof decks or floors in buildings.
  2. MANUFACTURER: A manufacturer who is regularly engaged in design and fabrication of wood truss components.
  3. TRUSS INSTALLER: Builder, contractor or sub-contractor who is responsible for the field storage, handling and installation of trusses.

 1.03 Truss Design

  1. Trusses shall be designed in accordance with these specifications and where any applicable design feature is not specified herein, design shall be in accordance with applicable provisions of latest edition of National Design Specifications for Wood Construction (NDS) American Forest and Paper Association (AFPA), and Design Specifications for Metal Plate Connected Wood Trusses (ANSI/TPI 1), Truss Plate Institute (TPI), and code of jurisdiction.
  2. Manufacturer shall furnish design drawings bearing seal and registration number of a civil or structural engineer licensed in state where trusses are to be installed. Drawings shall be approved by Architect prior to fabrication.
  3. Truss design drawings shall include as minimum information:
    1. span, depth or slope and spacing of trusses;
    2. required bearing width;
    3. design loads, as applicable: a. top chord live load;
      b. top chord dead load;
      c. bottom chord live load;
      d. bottom chord dead load;
      e. concentrated loads and their points of application; and
      f. wind and seismic criteria;
    4. adjustment to lumber and plate design loads for condition of use;
    5. reactive forces, their points of occurrence and direction;
    6. ALPINE/LUMBERMATE/CLARY plate type, gage, size and location
      of plate at each joint;
    7. lumber size, species and grade for each member;
    8. location of any required continuous later bracing;
    9. calculated deflection ratio and/or maximum deflection for live and total load;
    10. maximum axial compressive forces in truss members;
    11. location of joints;
    12. connection requirements for:
      a. truss to truss girders;
      b. truss ply to ply; and
      c. field splices.

 2.01 Materials

 A. Lumber:

    1. Lumber used for truss members shall be in accordance with published Values of lumber rules writing agencies approved by board of review of American Lumber Standards Committee. Lumber shall be identified by Grade mark of a lumber inspection bureau or agency approved by that Board, and shall be as shown on design drawings.
    2. Moisture content of lumber shall be no less than 7 percent nor greater than 19 percent at time of fabrication.
    3. Adjustment of values for duration of load or conditions of use shall be in accordance with National Design Specifications for Wood Construction (NDS).
    4. Fire retardant treated lumber, if applicable, shall meet specifications of truss design and ANSI/TPI 1-1995, par 9.1.5 and shall be re-dried after treatment in accordance with AWPA Standard C20. Allowable values must be adjusted in accordance with NDS par 2.3.6. Lumber treater shall supply certificate of compliance.

B. Metal connector plates:

    1. Metal connector plates shall be manufactured by ALPINE/LUMBERMATE/CLARY and shall be not less than .036 inches in thickness (20 gage) and shall meet or exceed ASTM A653-94 grade 37, and shall be hot dipped galvanized according to ASTM A653-94, coating designation G60. Working stresses in steel are to be applied to effective ratios for plates as determined by test in accordance with Appendix E and F of ANSI/TPI 1-1995.
    2. In highly corrosive environments, special applied coatings or stainless steel may be required.
    3. At the request of Architect, ALPINE/LUMBERMATE/CLARY shall furnish a certified record that materials comply with steel specifications.

 2.02 Truss Fabrication

    1. Trusses shall be fabricated in a properly equipped manufacturing facility of a permanent nature. Trusses shall be manufactured by experienced workmen, using precision cutting, jigging and pressing equipment meeting requirements of ANSI/TPI 1-1995, Section 4. Truss members shall be accurately cut to length angle and true to line to assure proper fitting joints within tolerances set forth in ANSI/TPI 1-1995, Section 4, and proper fit with other work.

 3.01 Handling, Installation and Bracing of Roof and Floor Trusses

    1. Truss delivery shall be scheduled reasonably near the scheduled time of erection.
    2. Trusses shall be handled during fabrication, delivery and at job site so as not to be subjected to excessive bending.
    3. Trusses shall be unloaded on smooth ground to avoid lateral strain. Trusses shall be protected from damage that might result from on-site activities and environmental conditions. Prevent toppling when banding is removed.
    4. Upon arrival and during the unloading process, trusses shall be inspected for damage.
    5. Handle during installation in accordance with Handling, Installing and Bracing Wood Trusses (HIB-91), TPI, and ANSI/TPI 1-1995. Installation shall be consistent with good workmanship and good building practices and shall be responsibility of Truss Installer.
    6. Apparent damage to trusses, if any, shall be reported to Manufacturer prior to installation.
    7. Trusses shall be set and secured level and plumb, and in correct location. Trusses shall be held in correct alignment until specified permanent bracing is installed.
    8. Cutting and altering of trusses is not permitted.
    9. Concentrated loads shall not be placed atop trusses until all specified bracing has been installed and decking is permanently nailed in place. Specifically avoid stacking full bundles of decking or other heavy materials onto unsheathed trusses.
    10. Erection bracing is always required. Professional advice should always be sought to prevent toppling or "dominoing" (cascading collapse) of trusses during installation.
    11. The Contractor is responsible for obtaining and furnishing the materials used for installation and permanent bracing.

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  Last updated 11/24/2003   Truss-Frame.com