1. Change Section Numbering When Used in Conjunction with Standard Specifications s2

06150B_D04-15-04

Page 5 of 5

Page 1 of 5

1. Change section numbering when used in conjunction with Standard Specifications.

6.__JOIST TRUSSES

PART 1.- GENERAL

SUMMARY.-

Scope.-This work shall consist of designing, fabricating, furnishing and erecting pre-engineered, factory fabricated joist trusses in accordance with the details shown on the plans and these special provisions.

Joist trusses shall have wood chords and metal tubular webs.

SUBMITTALS.-

Product data.-Manufacturer's data for lumber, adhesives and accessories shall be submitted for approval.

Paras. 8, 9, 10 and 11: Use with General Conditions. Delete Paras. 12, 13, 14 and 15.

Shop drawings.-Complete shop drawings, erection drawings, if required, and design calculations for the pre-engineered joist trusses, permanent bracing and connection details shall be submitted for approval. Submittals shall be approved prior to the start of fabrication.

Shop drawings and design calculations shall be stamped and signed by an engineer who is registered as a Civil or Structural Engineer in the State of California. The expiration date of the registration shall be shown. Engineer's original signature shall be submitted.

Shop drawings shall show the lumber size, species and grades for the truss chords and temporary and permanent bracing members. Joint and connection details shall be shown.

Shop drawings shall include a location plan which shows the location and identification of each joist truss.

Paras. 12 13, 14 and 15: Use with Standard Specifications. Delete Paras. 8, 9, 10 and 11.

Working drawings.-Complete working drawings, erection drawings, if required, and design calculations for the pre-engineered joist trusses, permanent bracing and connection details shall be submitted for approval. Submittals shall be approved prior to the start of fabrication.

Working drawings and design calculations shall be stamped and signed by an engineer who is registered as a Civil or Structural Engineer in the State of California. The expiration date of the registration shall be shown. Engineer's original signature shall be submitted.

Working drawings shall show the lumber size, species and grades for the truss chords and temporary and permanent bracing members. Joint and connection details shall be shown.

Working drawings shall include a location plan which shows the location and identification of each joist truss.

Calculations for the design of the joist trusses, bracing and connections shall include a list of applied loads and load combinations with the resulting member forces and member stresses.

If the design calculations contain or consist of computerized or tabulated calculations, the values pertaining to the design shall be identified, described or indexed in such a manner that a design review can be performed.

QUALITY ASSURANCE.-

Codes and Standards.-Joist trusses and permanent bracing shall be designed for the loads shown on the plans and other applied loads, including fire sprinkler systems. The design shall be in accordance with the requirements of the CBC, the "National Design Specification for Stress-Graded Lumber and Its Fasteners" by the National Forest Products Association (NFPA), and the "Timber Construction Standards," by the American Institute of Timber Construction (AITC). Joist trusses shall be ICBO approved.

20. Use with General Conditions. Delete Para. 21.

Certificates of Compliance.-Certificates of Compliance shall be furnished for joist trusses in accordance with the requirements specified in Section 41.04, "Certificates of Compliance," of the General Conditions.

21. Use with Standard Specifications. Delete Para. 20.

Certificates of Compliance.-Certificates of Compliance shall be furnished for joist trusses in accordance with the requirements specified in Section 61.07, "Certificates of Compliance," of the Standard Specifications.

DELIVERY, STORAGE AND HANDLING.-Trusses shall be transported and handled in such a manner as to prevent damage due to warping, distortion and moisture.

Joist trusses shall be stored off the ground.

PART 2.- PRODUCTS

MATERIALS.-

Joist truss.-

27. Use with General Conditions. Delete Para. 28.

Factory fabricated pre-engineered joist trusses with wood chords and metal webs. Trusses shall be sized to fit the locations shown on the plans. Lumber species and grades shall be as shown on the approved shop drawings. Lumber shall bear grade marks of a recognized grading association and the moisture content of the lumber shall be within the amount specified in the referenced specifications.

28. Use with Standard Specifications. Delete Para. 27.

Factory fabricated pre-engineered joist trusses with wood chords and metal webs. Trusses shall be sized to fit the locations shown on the plans. Lumber species and grades shall be as shown on the approved working drawings. Lumber shall bear grade marks of a recognized grading association and the moisture content of the lumber shall be within the amount specified in the referenced specifications.

Web members of the joist trusses shall be tubular steel. The diameters and thickness of the web members shall be as required by the design.

Connectors and fasteners.-

31. Use with General Conditions. Delete Para. 32.

Connectors and fasteners shall be as shown on the approved shop drawings.

32. Use with Standard Specifications. Delete Para.31.

Connectors and fasteners shall be as shown on the approved working drawings.

FABRICATION.-

General.-Trusses and bracing members shall be accurately cut to provide tightly fitted joints and connections.

Connectors, fasteners and other hardware accessories shall be coordinated for placement in the proper locations and positions.

Camber, if required by the design, shall be built into the trusses.

Each truss shall be stamped or marked with a location identification mark or symbol and with the name and address of the manufacturer.

PART 3.- EXECUTION

INSTALLATION AND ERECTION.-

General.-Joist trusses shall be erected plumb and true and shall be secured rigidly in place in accordance with the truss manufacturer's recommendations.

Fasteners and connectors shall be placed as shown on the plans and as recommended by the truss manufacturer.

Bracing shall be installed during erection to hold the trusses plumb and true and in a safe position until sufficient permanent construction is in place to provide full stability.

All permanent bracing shall be secured in place before any sustained permanent loads are applied to the joist truss system.

Materials loaded on joist truss system are to be located in such a manner to ensure that the design load of the trusses are not exceeded.