SECTION 06181

GLUE LAMINATED STRUCTURAL UNITS

PART 1 GENERAL

WORK INCLUDED

Glue laminated wood [beams] [purlins] [arches] [and] [__________.]

[Preservative treatment of wood.]

Steel hardware and attachment brackets.

WORK INSTALLED BUT FURNISHED UNDER OTHER SECTIONS

[Furnish attachment bracket anchor bolts to Section [_____] for placement.]

[Furnish anchor plates to Section [_____] for [attachment to formwork.] [casting into conrete work.]]

RELATED WORK

Section [_____ - __________:] Setting anchors in [foundations.] [__________.]

Section [_____-__________:] Prefabricated steel [structural supports.] [__________.]

Section 06112 - Framing and Sheathing: [Roof sheathing.] [__________.]

Section 06114 - Wood Blocking and Curbing.

Section 06125 - Wood Decking.

Section 06151 - Wood Chord Metal Joists.

Section 06192 - Prefabricated Wood Trusses.

Section 06196 - Plywood Web Joists.

Section 09900 - Painting: Finishing of exposed-to-view surfaces.

REFERENCES

AITC - American Institute of Timber Construction.

ALSC - American Lumber Standards Committee: Softwood Lumber Standards.

ANSI A190.1 - Structural Glued Laminated Timber.

ASTM A36 - Structural Steel.

ASTM A123 - Zinc (Hot Galvanized) coatings on Products Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Strip.

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

ASTM A325 - High Strength Bolts for Structural Steel Joints.

ASTM D2559 - Adhesives for Structural Laminated Wood Products for Use Under Exterior (Wet Use) Exposure Conditions.

AWPA - American Wood Preservers' 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.] [_____.]

QUALITY ASSURANCE

Manufacturer: Company specializing in manufacture of glue laminated structural units with [three] [_____] years minimum experience, and [certified by the AITC.] [in accordance with ANSI A190.1.]

Erector: Company specializing in erection of glue laminated structural units [with [_____] years [documented] experience.] [approved by manufacturer.]

Design structural members under direct supervision of Professional Engineer experienced in design of glue laminated structural units, registered in State of [__________.]

REGULATORY REQUIREMENTS

Conform to [applicable] [__________] code for loads, seismic zoning, and other load criteria.

SUBMITTALS

Submit shop drawings [and product data] under provisions of Section [01300.] [01340.]

Indicate framing system, sizes and spacing of members, loads and cambers, bearing and anchor details, bridging and bracing, framed openings, and [__________.] [Submit design calculations.]

[Provide technical data on wood preservative materials, application technique, and resultant performance information.]

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Protect members in accordance with AITC requirements for [unwrapped] [load wrapped] [bundle wrapped] [individually wrapped] material.

[Leave individual wrapping in place until finishing occurs.]

PART 2 PRODUCTS

ACCEPTABLE MANUFACTURERS

[_____________________________________________________.]

[_____________________________________________________.]

[_____________________________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MATERIALS

Lumber: [Softwood] [__________] lumber conforming to [__________] grading rules. Design for the following values:

Bending (Fb): [_____] psi ([_____] kPa).

Tension Parallel to Grain (Ft): [_____] psi ([_____] kPa).

Compression Parallel to Grain (Fc): [_____] psi ([_____] kPa).

Compression Perpendicular to Grain Bottom (Fcl): [_____] psi ([_____] kPa).

Compression Perpendicular to Grain Top (Fcl): [_____] psi ([_____] kPa).

Horizontal Shear (Fv): [_____] psi ([_____] kPa).

Modulus of Elasticity (E): [_____] psi ([_____] MPa).

Steel Connections and Brackets: ASTM A36; [weldable] [_____] quality, hot-dip galvanized to ASTM A123 [1.25] [_____] oz/sq ft ([380] [_____] g/sq m).

Steel Connections and Brackets: ASTM A167 Type 304 stainless steel.

Hardware: ASTM A325, structural quality steel; hot dip galvanized to [1.25] [_____] oz/sq ft ([380] [_____] g/sq m).

Anchor Bolts: ASTM A325 [galvanized] steel.

Adhesive: [ASTM D2559;] [_____;] Type [_____,] for [wet] [__________] condition of service.

Sealer: [_________________________.]

Bearing Plate Anchors: [Toggle bolt type for anchorage to hollow masonry.] [Expansion shield and lag bolt type for anchorage to solid masonry or concrete.] [Bolts or ballistic fasteners for anchorage to steel.]

WOOD TREATMENT

Fire Retardant: Chemically treated and pressure impregnated; capable of providing a maximum flame spread/fuel contribution/smoke development rating of [_____/_____/_____;] [_____] manufactured by [_____.]

Wood Preservative (Pressure Treatment): [FS TT-W-571] [AWPA Treatment C2] using [water borne] [_____] preservative with [0.30] [_____] percent retainage.

FABRICATION

Fabricate glue laminated structural members in accordance with AITC [industrial] [architectural] [premium] grade.

Verify dimensions and site conditions prior to fabrication.

Cut and fit members accurately to length to achieve tight joint fit.

Fabricate member with camber built in.

Do not splice or join members in locations other than that indicated, without permission.

Fabricate steel hardware and connections with joints neatly fitted, welded, and ground smooth.

After end trimming, [seal with penetrating sealer] [seal with sealer coat] [do not seal] [__________] in accordance with AITC requirements.

PART 3 EXECUTION

INSPECTION

Verify that supports are ready to receive trusses.

Verify sufficient end bearing area.

Beginning of installation means acceptance of existing conditions.

PREPARATION

Coordinate placement of [bearing] [support] items.

ERECTION

Set structrual members level and plumb, in correct positions.

Provide temporary bracing and anchorage to hold members in place until permanently secured.

Fit members together accurately without trimming, cutting, or any other unauthorized modification.

TOLERANCES

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

END OF SECTION