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READ AND REMOVE THIS OUTLINE GUIDE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

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O U T L I N E   G U I D E

DIVISION 6: WOOD AND PLASTICS

SECTION 06192 - PREFABRICATED WOOD TRUSSES

USE:	Furnishing and installing the pre-fabricated wood trusses which support the roofing.

NOTES TO SPECIFIER:

A.	Options within paragraphs are identified by enclosure in brackets; blank spaces enclosed by brackets [      ] provide for information to be inserted, as appropriate to individual projects.

B.	TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES, the specifier must edit (delete, substitute or add to the text).  The remaining paragraphs must be renumbered.

C.	DELETE FOR FINAL COPY: Notes to the Specifier, located between lines of asterisks; all [brackets], underlining, boldface, and italics within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately).

D.	To Edit “(Footer B)”: (Corel 8).  ENTIRE FOOTER SHOULD BE BOLDED.  Click in the footer and delete the “Project Name (ftr B)” text and replace it with the Name Of The Project (upper/lower case).  Replace date with current MM/YY (WITHOUT BRACKETS). 

E.	The Guide Specifications are intended to be continuously reviewed and revised.  User’s technical comments are appreciated.  Also, other related or similar specifications that are written “from scratch” that could benefit others, or other questions can be sent to NSTC A/E Group, RS-110 or call (303) 987-6851.

F.	DESIGN NOTES:

1.	DRAWING DATA REQUIRED:

		Extent and location of trusses; design loadings required to permit fabricator’s design of members and connections; dimensions and configurations including spans, pitch, camber, sizes and spacing; connection details; bracing arrangement and details; anchorage and bearing details.

REVISIONS OF THIS SECTION:
CSI format, editorial changes 09/00
Metric: Not Applicable
Technical Update: 09/00

SECTION 06192

PRE-FABRICATED WOOD TRUSSES

PART 1: GENERAL

1.1	SUMMARY

A.	Section Includes: Furnishing and installing the pre-fabricated wood trusses which support the roofing.

B.	Related Sections:
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LIST ITEMS OF WORK THAT MIGHT LOGICALLY BE FURNISHED AND INSTALLED UNDER THIS SECTION, BUT INSTEAD ARE SPECIFIED IN ANOTHER SECTION.  THIS ARTICLE IS RARELY REQUIRED.
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1.2	SUBMITALS

A.	General: Submittals shall be according to [Section - 01009 - General Information and Requirements,] [and] [Section 01330 - Submittal Procedures] [and] [Section 01331 - Certificates].

B.	Shop Drawings: Submit [    ] copies of shop [and erection] drawings and calculations for the prefabricated wood trusses to be used on this project. Drawings and calculations shall be prepared by and bear the stamp of a registered professional engineer.  Shop drawings shall indicate location, pitch, span, camber, configuration, and spacing for each type of truss required; species, sizes, and grade of lumber; splice details; type, size, material, finish, design values, orientation, and location of metal connector plates; and bearing details.  Drawings shall be [same] [larger] scale as the full size Contract drawings.

1.3	QUALITY ASSURANCE

A.	Labeling Requirements: Factory-mark each member with the mark of a recognized grading agency which identifies the species and grade.   

B.	Failure Criteria: Not limited to the following:
1.	Disengagement of wooden members from a connecting metal plate.
2.	Sag at center of span sufficient to cause cracking or visible deflection of finish or subsurface ceiling material.

1.4	DELIVERY, STORAGE, AND HANDLING

A.	Delivery: Do not wrack or twist trusses during movement.  Loading, unloading and erecting of trusses shall be conducted in a manner and form which will not cause excessive stresses in the member or joists.

B.	Storage: Comply with TPI recommendations to avoid damage and lateral bending.  Provide for air circulation around stacks and under coverings.  

PART 2: PRODUCTS

2.1	MATERIALS

A.	Chord and Web Members:  Provide dimension lumber of any species for truss chord and web members, graded visually or mechanically, and capable of supporting required roads without exceeding allowable design values according to AFPA’s “Natural Design Specifications for Wood Construction” and its “Supplement”.

B.	Moisture Content: Shall be 19 percent at time of dressing.

C.	Metal Connector Plates: Shall be manufactured in accordance with TPI.

D.	Metal Framing Anchors: Shall be constructed to the structural capacity, type, and size indicated using hot-dip, zinc-coated steel according to ASTM A 650, coating designation G 60, 18 gauge minimum thickness.  Special nails supplied by manufacturer shall be used for nailing of anchors.

E.	Bracing: Shall be 2-inch x 4-inch and 1-inch x 4-inch [50 mm x 100 mm and 25 mm x 100 mm] lumber of Douglas Fir, Hemlock, or Larch, construction grade, according to WCLIB or WWPA.

F.	Box Nails: FS, FF-N-105

2.2	FABRICATION

A.	Requirements:
1.	Trusses shall be shop manufactured in accordance with TPI 1.
2.	Roof trusses shall be capable of carrying uniform and point loads as follows:
a.	Top chord live load [        ] pounds per square foot.
b.	Top chord dead load [      Pounds per square foot.
c.	Bottom chord dead load [     ] pounds per square foot.
d.	Wind load [       ] pounds per square foot.
e.	Point load [     ] pounds, located [     ].

PART 3: EXECUTION

3.1	EXAMINATION

A.	Verification of Conditions: Prior to erecting trusses, verify that bearing surfaces are completed as required, are properly braced and are correctly spaced horizontally to ensure proper alignment with the truss bearing surfaces.

B.	Inspection: Do not erect trusses until the Contracting Officer has inspected each truss for faulty fabrication, including surface defects.  Trusses found unacceptable shall be repaired as instructed or replaced in entirety at the Contractor’s expense.

3.2	INSTALLATION

A.	Requirements:  Install and brace trusses according to TPI recommendations and as indicated on the erection drawings. 

B.	Spacing:  Truss spacing shall be that shown on the approved shop drawings.  Adjust and align trusses before permanently fastening.

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IF A RIGID CEILING (SUCH AS GYPSUM BOARD) WILL BE DIRECTLY APPLIED TO THE BOTTOM CHORD OF THE TRUSS, THE PERMANENT BRACING BELOW MAY BE DELETED.
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C.	Permanent Bracing:  Trusses shall be braced with 1-inch x 4-inch [25 mm x 100 mm] nominal wood members installed perpendicular to the trusses over the lower chord members and nailed to the chord with 2-6d nails.

D.	Bearing: Trusses shall be toe-nailed to wall plate with 2-10d nails each side.  In addition, framing anchors shall be installed at each truss, both ends, to fasten to bearing plates against uplift and movement of any kind.

E.	Exposure: Trusses may be exposed to rain two days maximum during erection only.  Otherwise protect from moisture.

PART 4:  MEASUREMENT AND PAYMENT

4.1	METHOD OF MEASUREMENT

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WHEN A “LUMP SUM” CONTRACT IS USED, DELETE THE TITLE PART 4:  MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.  MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 - GENERAL INFORMATION AND REQUIREMENTS OR SECTION 01010- SUMMARY OF WORK.  WHEN NOT A “LUMP SUM” CONTRACT, SELECT APPLICABLE PHRASES; USE THE “NO MEASUREMENT” PHRASE WHEN NONE OF THE PAY ITEMS IN THS SECTION ARE INCLUDED IN THE BID SCHEDULE.
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A.	Units: The work described in this section will [not be measured for payment]. [be measured for and paid for] [on a lump-sum basis].

4.2	BASIS OF PAYMENT

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WHEN NOT A “LUMP SUM” CONTRACT, SELECT APPLICABLE, SELECT APPLICABLE PHRASES; USE THE “NO DIRECT PAYMENT” PHRASE WHEN NONE OF THE PAY ITEMS IN THE SPECIFICATION ARE INCLUDED IN THE BID SCHEDULE.

WHEN NOT A “LUMP SUM” CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS SECTION, SELECT APPLICABLE PAY ITEMS.  DO NOT CHANGE PAY ITEM NUMBER.  WHEN MORE THAN ONE DIAMETER OR GAUGE IS SPECIFIED FOR ANY PAY ITEM, LETTER SUFFIXES WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER.  WHEN GOVERNMENT-FURNISHED PROPERTY IS SPECIFIED FOR PAY ITEMS, THE LETTER SUFFIX GF WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER.
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A.	Payment: [No direct payment for the work described under this section will be made.  Consideration for this item shall be included in the bid price for other items of the Contract]. [Prices and payment will be full compensation for the work described in this section.  Payment will be made under:]

Pay Item	Pay Unit

END OF SECTION

PRE-FABRICATED WOOD TRUSSES
Project Name (ftr B)	[9/00]
06192 -