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Specification Style Three
SECTION 06181
GLUED-LAMINATED STRUCTURAL

PART 1  GENERAL

SECTION INCLUDES

A.Work under this section includes all labor, material, equipment, and related services necessary to furnish and install all prefabricated structural wood indicated on the drawings or specified herein.

B.Related Sections

1.Section 04XXX - Unit Masonry
2.Section 05XXX - Structural Metal and/or
3.Section 05XXX- Metal Fabrications
4.Section 06XXX - Carpentry
5.Section 09XXX - Painting

REFERENCES

A.ANSI A190.1 - Structural Glued Laminated Timber
B.APA/EWS - Engineered Wood Systems
C.AWPA - American Wood Preservers' Association
D.ASTM D2559 - Adhesives for Structural Laminated Wood Products for Use Under Exterior (Wet Use) Exposure Conditions.
E.ASTM A36 - Structural Steel
F.ASTM A307 - Structural Bolts for Carbon Steel Bolts and Studs
G.ASTM A123 - Zinc (Hot Galvanized) Coatings on Products Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Strip.

SUBMITTALS

A.Shop Drawings:  Submit complete fabrication and erection drawings prior to manufacture including all connection details with sufficient detail, dimensions and notations to permit a thorough review by the Project Architect/Engineer.

B.Samples:  Submit prior to manufacture, sample of surface texture and stain, if applicable, as selected by Architect.

C.Acceptance:  Manufacture shall not begin until acceptance is received from the Architect/Engineer.

D.Certification:  Affix Quality Control Mark on all principle glued laminated members furnished under this Section.  Provide certificate of conformance according to section 1.02, subsection A.

DELIVERY, STORAGE AND HANDLING

A.Supplier shall retain and store material under a shelter that will prevent damage due to weather until needed at the jobsite.

B.Contractor shall be responsible for protection of the materials after arrival at the project site.

C.Use non-marring slings for loading, unloading, and handling members to minimize damage to surfaces and/or wrapping.

D.Unload at site and place on adequate, level, off-ground support. Materials shall be covered and protected from the elements.

REGULATORY REQUIREMENTS

Conform to (applicable) code for loads, seismic zoning, and other load criteria.

PART 2   PRODUCTS

MANUFACTURERS

A.The manufacturers named herein are specified to establish standards of quality, performance, and design concept.  Products of other manufacturers will be considered provided written request for approval is received by the Architect not less than (7) days prior to bid date.

1.Laminators
a.Alamco Wood Products
b.Williamette Industries
c.Filler King Company

2.Manufacturing, Finishing, Installation
a.Alamco
b.Structural Wood Corporation

MATERIALS

A.Materials, manufacture and quality control shall be in conformance with American National Standard ANSI A190.1, "Structural Glued Laminated Timber".

Laminating Combinations:  Laminating combinations shall be (select one): West Coast Douglas Fir or Southern Yellow Pine species that meets the requirements of ANSI A190.1, "Structural Glued Laminated Timber", and shall provide allowable design values of:

For beams, purlins, and arches

1.2,400 psi in bending (Fb), modified per latest volume effect factor (Cv) as required (See AITC Technical Note No. 21 dated October 1,1991.)
2.1,150 psi in tension parallel to grain (Ft)
3.1,600 psi in compression parallel to grain (Fc)
4.650 psi in compression perpendicular to grain both top and bottom (Fc)
5.265 psi in horizontal shear (Fv)
6.1,800,000 psi in modulus of elasticity (E)

For axially loaded members

1.900 psi in tension parallel to grain (Ft)
2.1,350 psi in compression parallel to grain (Fc)
3.1,500,000 psi in modulus of elasticity (E)

For alternatives to treated wood, please contact Structural Wood Corporation (800) 652-9058. We can supply design values of Alaskan Red Cedar and Port Orford Cedar species.

Adhesive:  Waterproof-type conforming to the test requirements of ANSI A190.1 for wet use adhesive.

Appearance Grade:  (Select One)
Industrial
Industrial Clean (used for treated members)
Architectural

Surface Texture:  (Select One)
Rough Sawn Texture (cross sanded)
Smooth Sanded Surface (#36 grit)

Surface Protection:  Ends of prefabricated structural wood members shall have one coat of end sealer applied immediately after trimming.  All other surfaces shall receive:

One coat of clear penetrating sealer.  Final Finish is specified in painting section.
(or)

Prefinish with one coat of Olympic Semi-Transparent Oil Stain, color as selected by Architect. Required jobsite touch-up shall be by painting section (09XXX).

Wrapping:  Provide water resistant wrapping covering all surfaces of individual  members.

Fabrication:  Prefabrication of members should be performed, as much as practical, in the shop.

Steel and Hardware:  The fabricator shall furnish connection steel and hardware  for joining timber members to each other and to their supports exclusive of anchorage embedded in masonry, setting plates, and items field welded to structural steel.  Steel shapes to have one coat of shop applied primer containing rust inhibitor.  Hardware to be zinc plated. Shear plates shall be painted or galvanized to prevent staining during erection process.

WOOD TREATMENT

When the conditions of service are such that Fire Retardant treatment (or) Wood Preservative treatment to prevent attack by decay organisms or insects is required, contact Structural Wood Corporation (800) 652-9058 for further guidance. If treatment is required, information such as the following should be given in your specification:

Wood Preservative (Pressure Treatment)

The preservative shall be    Ammoniacal Copper Quat    type.
The retention shall be     .60     (lbs/ft^3)

Fire Retardant:

CLASS 'A' FLAME SPREAD - Treat with a process used to obtain a flame spread index of 25 or less in an ASTM E-84 test by an accredited independent test agency.

CLASS 'B' FLAME SPREAD - Treat with a process used to obtain a flame spread index of 75 or less in an ASTM E-84 test by and accredited independent test agency.

PART 3   EXECUTION

ERECTION

A.Erect laminated structural members strictly according to approved shop drawings. Erect members plumb, level, and true to lines and dimensions with full bearing. Install temporary bracing as necessary during erection and maintain until permanent stability is provided.

B.Protect surfaces from damage during erection. Use non-marring slings when handling/ erecting members.
C.Due to normal construction tolerances, it should be understood that a certain number of bolts must be drifted in order to gain proper alignment.  Under no condition should bolt holes or connections be torched or otherwise re-manufactured in the field without the knowledge and consent of the Architect/Engineer and the manufacturer.

PROTECTION

A.Water resistant wrapping, if used, is primarily for the in-transit protection of glued laminated members.  Judgment should be exercised to determine if wrapping should be removed or left intact until the members are enclosed within the building.

1.If wrapping has to be removed at certain connection points, it shall be replaced after the connection is made.  If it is impractical to replace the wrapping, all of it shall be removed.  Individual wrappings, if not removed, shall be slit or punctured on the lower side to prevent moisture from collecting inside the wrapping.
2.In no case should the wrapping be left on the beams for more than two weeks after erection unless protected by decking.

B.Heat should not be fully turned on as soon as the structure is enclosed; otherwise, excessive drying and checking may occur.  Initial building heat shall be elevated gradually to desired level. A gradual seasoning period at moderate temperature and moisture should be extended through the first heating season.

TOLERANCES

A.Framing Members: Half inch maximum from true position.

END OF SECTION

GLUED-LAMINATED STRUCTURAL REV.3.05	06180- 5