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=§CHAPTER 3 QUALITY CRITERIA FOR THE MANUFACTURE OF METAL PLATE CONNECTED WOOD TRUSSES=

§3.1.1
Chapter 3 is the quality standard for the manufacturing processes of metal plate connected wood trusses, and shall be used in conjunction with a manufacturing quality assurance procedure and a truss design.

§3.1.2
Metal plate connected wood trusses shall meet the minimum manufacturing quality requirements specified in this chapter, so that design assumptions are met. xuyxyxyxyxy

§3.1.3
Truss Manufacturers and inspection agencies shall establish methods that document the application of these quality assurance procedures throughout the manufacturing process. The Truss Manufacturers' methods shall be subject to periodic audit for compliance with the requirements of this standard by an approved inspection agency, where required by local authorities having jurisdiction, or other means.

§3.1.4
Manufacturing inaccuracies exceeding the allowable tolerances described in this section are acceptable upon approval and follow-up documentation by a Truss Designer. Any necessary repair authorization shall be prepared by a Truss Designer.

§3.2.1
An in-plant quality control manual shall be maintained for each truss manufacturing facility, which will include the requirements for daily quality control and any audits that will be performed.

§3.2.2
At a minimum, 3 trusses per week per set-up location per shift shall be inspected and recorded for in-plant audits.

§3.2.3
A random representative sampling of trusses shall be chosen for inspection, either off the production line after all pressing operations are completed, or from finished goods storage.

§3.2.4
For trusses chosen for inspection, the joint inspection procedures of Section 3.7 shall be used with joints designed using a quality control factor, Cq, equal to 1.00 for plates embedded into lumber faces wider than 2 inches, or 1.11 for plates embedded into lumber faces less than or equal to 2 inches.

§3.2.4.1
For joints designed with a Cq value greater than the Truss Manufacturer's Cq value, per Section ===§6.4.1===§1.3, the Truss Manufacturer shall follow the joint inspection procedures in Annex A3 for those joints.

§3.2.4.2
When the Truss Manufacturer's Cq value is greater than 1.00 for plates embedded into lumber faces wider than 2 inches, or greater than 1.11 for plates embedded into lumber faces less than or equal to 2 inches, the Truss Manufacturer shall provide to the approved inspection agency, or through other means, justification for the increase, and the inspection procedures of Annex A3 shall be used.

§3.3 TRUSS DESIGN
A truss design drawing shall be provided for every truss, prior to manufacture and inspection.

§3.4.1
Truss lumber shall be the grade and size specified on the truss design drawing. Truss lumber of a different grade shall be permitted to be substituted if the substitute grade does not exceed the coefficient of variation for modulus of elasticity (COVE) of the specified grade, and meets or exceeds the specified grade for each of the following properties: (a) allowable design value for bending (Fb); (b) allowable design value for tension (Ft); (c) allowable design value for compression parallel to grain (Fc); (d) allowable design value for compression perpendicular to grain (Fc?); (e) allowable design value for shear (Fv); (f) allowable design value for bearing (Fg); (g) specific gravity (G); and (h) average modulus of elasticity (MOE) Any changes in grade not meeting the above requirements, or any changes to structural composite lumber products shall require the review and approval of a Truss Designer.

§3.4.2
Prior to cross-cutting, lumber packaged in 8 ft (2.44 m) and longer lengths shall be identified by the grade mark or the certificate of inspection issued by a lumber inspection bureau or agency accredited by the Board of Review of the American Lumber Standard Committee. For lumber shorter than 8 ft. (2.44 m) in length, the grade shall be identified by a label affixed to the package.

§3.4.3
Preservative treated lumber shall be identified by the quality mark of, or a certificate of inspection from, an approved inspection agency and shall be identified by a label affixed to the package (see also Section ===§6.4.9===§).

§3.4.4
Lumber impregnated with fire retardant chemicals shall be identified by the quality mark of, or a certificate of inspection from, an approved inspection agency and shall be identified by a label affixed to the package (see also Section ===§6.4.9===§).

§3.4.5
Structural finger-jointed lumber shall be permitted to be used interchangeably with solid-sawn members of the same grade and species if the finger joints are manufactured with an adhesive meeting the requirements of ASTM D2559. Structural finger-jointed lumber shall be identified by the grade mark of, or certificate of inspection from, a lumber grading or inspection agency that has been approved by an accreditation body that complies with U.S. Department of Commerce (DOC) PS 20 or equivalent. The grade mark and certification of inspection for structural finger-jointed lumber shall indicate that joint integrity is subject to qualification and quality control. When finger-jointed lumber is marked "STUD USE ONLY" or "VERTICAL USE ONLY", such lumber shall not be used in metal plate connected wood trusses.

§3.4.6
Splits in any wood member caused by metal connector plate teeth or the manufacturing process shall not exceed those permitted in the grade and species of lumber used.

§3.5.1
Trusses shall be manufactured using cutting, jigging, and pressing equipment. The location of chords, webs, and joints shall be as specified on the truss design drawing.

§3.5.2
Members shall be cut in accordance with the truss design drawing.

§3.5.3
Truss height and length dimensions that vary from the truss design drawing shall not exceed the tolerances shown in Table 3.5-1. Table 3.5-1 Structural Manufacturing