SECTION 06193

PLATE CONNECTED WOOD TRUSSES

PART 1 GENERAL

SECTION INCLUDES

Shop fabricated wood trusses for [roof] [and] [floor] framing.

Bridging, bracing, and anchorage.

[Preservative treatment of wood.]

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section [______-____________]: Placement of bearing plates.

RELATED SECTIONS

Section [_____-_________]: Setting anchors in [concrete.] [masonry.] [________.]

Section [_____-_________]: Prefabricated [steel structural supports.] [________.]

Section 06112 - Framing and Sheathing.

Section 06114 - Wood Blocking and Curbing.

Section 06125 - Wood Decking.

Section 06131 - Heavy Timber Framing.

Section 06135 - Heavy Timber Trusses.

Section 06151 - Wood Chord Metal Joists.

Section 06181 - Glued Laminated Structural Units.

Section 06196 - Plywood Web Joists.

REFERENCES

ALSC - American Lumber Standards Committee: Softwood Lumber Standards.

ASTM A167 - Stainless and Heat Resisting Chromium - Nickel Steel Plate, Sheet, and Strip.

ASTM A446 - Steel Sheet, Zinc Coated (Galvanized) by the Hot-Dip Process, Structural (Physical) Quality.

AWPA (American Wood Preservers Association) C1 - All Timber Products Preservative Treatment by Pressure Process.

AWPA (American Wood Preservers Association) C20 - Structural Lumber Fire Retardant Treatment by Pressure Process.

NFPA: National Forest Products Association.

RIS: Redwood Inspection Service.

SPIB: Southern Pine Inspection Bureau.

TPI (Truss Plate Institute) BWT-76 - Bracing Wood Trusses.

TPI (Truss Plate Institute) HET-80 - Handling and Erecting Wood Trusses.

TPI (Truss Plate Institute) PCT-80 - Metal Plate Connected Parallel Chord Wood Trusses.

TPI (Truss Plate Institute) TPI-85 - Metal Plate Connected Wood Trusses.

TPI (Truss Plate Institute) QST-88 - Metal Plate Connected Wood Trusses.

WCLIB:	West Coast Lumber Inspection Bureau.

WWPA: Western Wood Products Association.

SYSTEM DESCRIPTION

Design floor live [and dead] load: [____] lbs/sq ft ([____] KPa) with deflection limited to [1/360] [____].

Design roof live [and dead] load: [____] lbs/sq ft ([____] KPa) with deflection limited to [1/240] [____].

Minimum Truss Depth To Accommodate Mechanical Ducts: [____] inch ([____] mm).

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Shop Drawings: Indicate sizes and spacing of trusses, loads and truss cambers, framed openings and [________]. [Submit design calculations.]

Product Data: Provide truss configurations, bearing and anchor details, bridging and bracing, and [________].

QUALITY ASSURANCE

Perform Work in accordance with the following agencies:

Lumber Grading Agency:	Certified by ALSC.

Plywood Grading Agency: Certified by [APA.] [____.]

Truss Design, Fabrication, and Installation:	In accordance with Truss Plate Institute BWT-76, HET-80, PCT-80 including Supplement, TPI-85 including Supplement, QST-88.

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_______] years [documented] experience.

Design trusses under direct supervision of a Professional Structural Engineer experienced in design of this Work and licensed [at the place where the Project is located] [in the State of [____________]].

REGULATORY REQUIREMENTS

Conform to [applicable] [_________] code for loads, seismic zoning, other governing load criteria, [and fire retardant requirements].

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect, and handle products to site under provisions of Section [01600.] [________.]

Handle and erect trusses in accordance with TPI HET-80.

Store trusses in vertical position resting on bearing ends.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings].] [instructed by the manufacturer.]

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600.] [________.]

MATERIALS

Lumber Grading Rules: [NFPA] [RIS] [SPIB] [WCLIB] [WWPA] [________].

Wood Members: Single top and bottom chord, [Stress Group [____],] [[________] species [________] grade [________] size classification,] [19] [____] percent maximum and [7] [____] percent minimum moisture content. [Finger scarfing [not] permitted.]

Plywood Connectors: Graded by APA; [________] species, [ply] [lumber] core, [________] grade, waterproof glue; [19] [____] percent maximum moisture content.

****** [OR] ******

Steel Connectors: ASTM A446 steel, Grade [B] [____], [hot dip] galvanized; [die stamped with integral teeth] [________]; [____] inch ([____] mm) thick.

****** [OR] ******

Steel Connectors: ASTM A167 Type 304 stainless steel; [die stamped with integral teeth] [________]; [____] inch ([____] mm) thick.

Truss Bridging: [Type, size and spacing recommended by truss manufacturer.] [________.]

ACCESSORIES

Wood [Blocking] [Plating] [Support Members] [Framing for Openings]: [In accordance with Section [06114] [________]] [softwood lumber, [S/P/F] [________] species, [construction] [________] grade, [19] [____] percent maximum and [7] [____] percent minimum moisture content.

Fasteners: [Electro-galvanized] [Hot dip galvanized] [unfinished] steel, type to suit application.

Bearing Plates:	[Electro-galvanized] [Hot dip galvanized], [plain steel.] [________.]

FABRICATION

Fabricate trusses to achieve structural requirements specified.

Brace wood trusses in accordance with TPI BWT-76.

WOOD TREATMENT

Fire retardant: [AWPA Treatment C20, [Exterior] [Interior] Type,] chemically treated and pressure impregnated; capable of providing a maximum flame spread/smoke development rating of [____] / [____]; [________] manufactured by [____________].

Wood Preservative (Pressure Treatment): [AWPA Treatment C1] using [water borne] [_____________] preservative with [0.25] [_____] percent retainage.

Wood Preservative (Surface Application):	[Clear] [colored], [_____________] type, manufactured by [_____________].

PART 3 EXECUTION

EXAMINATION

Verify that supports and openings are ready to receive trusses.

PREPARATION

Coordinate placement of [bearing] [support] items.

ERECTION

Install trusses in accordance with manufacturer's instructions.

Set members level and plumb, in correct position.

Make provisions for erection loads, and for sufficient temporary bracing to maintain structure plumb, and in true alignment until completion of erection and installation of permanent bracing.

Do not field cut or alter structural members without approval of Architect/Engineer.

Place headers and supports to frame openings required.

Frame openings between trusses with lumber [in accordance with Section [06114.] [________.]

Coordinate placement of decking with work of this section.

[After erection, touch-up [primed] [galvanized] surfaces with [primer consistent with shop coat] [zinc primer].]

SITE APPLIED WOOD TREATMENT

Apply preservative treatment in accordance with	manufacturer's instructions.

Brush apply [one] [two] coats of preservative treatment on wood in contact with [cementitious materials] [roofing and related metal flashings] [and] [_________]. [Treat site-sawn cuts.]

Allow preservative to dry prior to erecting members.

TOLERANCES

Framing Members:	[1/2] [____] inch ([12] [____] mm) maximum, from true position.

SCHEDULES

Main Roof: 26 foot span truss, 22 inch overhang, 4/12 pitch, 4 inch end bearing plates for masonry supporting wall.

Main Roof: 14 foot span truss, no overhang, 2/12 pitch, 4 inch end bearing plates for steel supporting frame.

END OF SECTION