SECTION 06192 — PREFABRICATED WOOD TRUSSES


PART 1 — GENERAL

1.01 DESCRIPTION

Extent and spans of prefabricated wood trusses are shown on the Drawings. Detailed design of truss structural system shall be the responsibility of the Contractor.

1.02 STANDARDS

Comply with: N.F.P.A. National Design Specification (1991 Edition)
“National Design Standard for Metal Plate Connected Wood Trusses” (ANSI/TPI 1-1995)
“Handling, Installing, & Bracing Metal Plate Connected Wood Trusses” (HIB-91)
“Recommended Design Specification for Temporary Bracing of Metal Plate Connected Wood Trusses” (DSB-89)
“Standard Responsibilities in the Design Process Involving Metal Plate Connected Wood Trusses” (WTCA 1-1995)

1.03 SUBMITTALS

Prior to fabrication submit six (6) sets of shop drawings to the Architect which have been signed and stamped by a structural engineer licensed to practice in Wisconsin.

The truss design drawings are to show:
• Design loadings and load duration adjustment.
• Pitch, span, spacing and configuration.
• Depth of parallel chord trusses.
• Size, gauge, location and orientation of connector plates.
• Location of bearing requirements.
• Maximum deflection.
• Forces on chords and webs.
• Lumber species, grade and size.
• Permanent web bracing required to prevent compression buckling.
• Number of truss plys required on girder designs.
• Bearing sizes required.

1.04 HANDLING

Handle and store trusses with care and to comply with TPI recommendations to avoid damage from bending, overturning or other cause.


PART 2 — PRODUCTS

2.01 LUMBER

Provide lumber S4S, S-dry unless otherwise indicated, grade marked, complying with PS 20 and requirements indicated. Provide lumber which has been graded or tested and certified to comply with stress ratings required for designed performance.




2.02 ACCESSORIES

Metal Connector Plates: Not less than 20 ga. (0.036") coated thickness, either galvanized sheet complying with ASTM A 446, Grade A, G60, or Electrolytic zinc-coated steel sheet complying with ASTM A 591, Class C, with minimum yield of 30,000 psi and a minimum ultimate tensile strength of 45,000 psi.

Fasteners and Anchorages: Of size, type, material and finish suit to application shown and complying with applicable standards including FS FF-N-105 and FF-W-92, and with ANSI B18.6.1.

2.03 FABRICATION

Fabricate and assemble trusses to provide units of configuration indicated, with closely fitted joints and connector plates securely fastened to wood members.

Tag all trusses for truss erector to properly identify, orient and position trusses on building.


PART 3 — EXECUTION

3.01 INSTALLATION

Install trusses to comply with TPI referenced standards and other requirements indicated on Drawings.

Install temporary erection bracing to hold trusses true and plumb and in a safe condition until permanent bracing can be installed. Install permanent bracing before applying any loads to the trusses.

Install adequate anchors at all bearing points to secure trusses against wind uplift on roof trusses.

Do not cut or modify trusses in any way without the written approval of the truss fabricator and Architect.


END OF SECTION 06192

PREFABRICATED WOOD TRUSSES 06192-#
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org