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| | SECTION 06139 |
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| | TIMBER CONSTRUCTION |
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| | ** NOTE TO SPECIFIER ** Western Red Cedar Lumber Association, Timber Construction.
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This section is based on Publication 97-508, Revised February 2004, Specifying Western Red Cedar for Timber Construction and Landscape Structures, published by the Western Red Cedar Lumber Association (WRCLA), whose head office is at the following address.
1501-700 West Pender Street
Pender Place 1, Business Building
Vancouver, British Columbia V6C 1G8
Toll Free Te1: 1-866-778-9096
Tel: (604) 684-0266
Fax: (604) 687-4930
E-mail: wrcla@wrcla.org
Website: www.wrcla.org
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The Western Red Cedar Lumber Association is an organization of Western Red Cedar producers, distributors and retailers throughout North America. Founded in 1954, the association is known worldwide as "the voice of the cedar industry". Its members account for more than 65 percent of the world's production of cedar and have an annual volume of nearly 1 billion board feet..
The mission of the WRCLA is to promote quality Western Red Cedar products and support them with a comprehensive marketing and PR program, technical services, education and training..The WRCLA works closely with architects, designers and builders to ensure the right product is specified and utilized for each project. The association offers extensive resources for including specification & installation guides and DVDs available in English, Spanish and Russian. The WRCLA has two education programs eligible for AIA Learning Credits. Its online architect training (www.cedar-training.org) course is eligible for 7 credit hours and the more informal group presentation offers 2 credit hours..The Association's RealCedar branding program promotes Western Red Cedar as the premier building material for naturally durable siding, decking and outdoor landscape features that will enhance the curb appeal of any home. The program is supported by extensive advertising, internet promotion (www.architect-gallery.org), trade show exhibits, point of purchase material, literature and sponsorships of high profile projects and architect Design Awards.. |
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| | PART 1 | GENERAL |
| | ** NOTE TO SPECIFIER ** Select paragraphs below applicable to project; add others as required. |
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| | 1.1 | SECTION INCLUDES |
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| | | A. | Engineered Structures, including: |
| | | | 1. | Commercial buildings. |
| | | | 2. | Industrial buildings. |
| | | | 3. | Residential buildings. |
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| | | B. | Landscape structures, including: |
| | | | 1. | Bridges. |
| | | | 2. | Arbors. |
| | | | 3. | Pergolas. |
| | | | 4. | Gazebos. |
| | | | 5. | Field houses. |
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| | 1.2 | RELATED SECTIONS |
| | ** NOTE TO SPECIFIER ** Delete sections below not relevant to this project; add others as required. |
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| | | A. | Section 06100 - Rough Carpentry. |
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| | | B. | Section 06151 - Cedar Decking. |
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| | | C. | Section 06221 - Cedar Trim. |
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| | | D. | Section 07462 - Cedar Siding. |
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| | 1.3 | REFERENCES |
| | ** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section; add others as required. |
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| | | A. | Western Red Cedar Lumber Association "Designer's Handbook". |
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| | | B. | Western Red Cedar Lumber Association ""Specifying Western Red Cedar for Timber Construction and Landscape Structures".". |
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| | | C. | Western Red Cedar Lumber Association "Guide to Finishing Western Red Cedar" |
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| | | D. | NLGA - National Lumber Grades Authority "Grading Standards". |
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| | | E. | WCLIB - West Coast Lumber Inspection Bureau "Grading Standards". |
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| | | F. | WWPA - Western Wood Products Association "Grading Rules". |
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| | 1.4 | SUBMITTALS |
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| | | A. | Submit under provisions of Section 01300. |
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| | | B. | [ Product Data ]: Manufacturer's data sheets on each product to be used, including: |
| | | | 1. | Preparation instructions and recommendations. |
| | | | 2. | Storage and handling requirements and recommendations. |
| | | | 3. | Installation methods. |
| | ** NOTE TO SPECIFIER ** Delete selection samples if colors have already been selected. |
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| | | C. | Verification Samples: For each finish product specified, two samples representing actual product with finished color and texture. |
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| | 1.5 | QUALITY ASSURANCE |
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| | | A. | Manufacturer Qualifications: Manufacturer shall be a member of the Western Red Cedar Lumber Association capable of providing all cedar timber materials specified in this section. |
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| | | B. | Installer Qualifications: |
| | | | 1. | Installer shall have five (5) years experience installing cedar timber on the type and size of project specified by this section. |
| | | | 2. | Installer shall be licensed, registered or otherwise approved by the local jurisdiction to install Cedar timber. |
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| | 1.6 | DELIVERY, STORAGE, AND HANDLING |
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| | | A. | Inspect the materials upon delivery to assure that specified products have been received. |
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| | | B. | Store materials in safe area, away from construction traffic; store under cover and off ground, protected from moisture. |
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| | | C. | Keep materials clearly separated and identified with grade marks legible. Keep damaged material identified as damaged and stored separately. |
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| | 1.7 | PROJECT CONDITIONS |
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| | | A. | Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's absolute limits. |
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| | 1.8 | SUPPLEMENTAL MATERIALS |
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| | | A. | Fasteners, supports, and hangers shall be provided by manufacturers other than member organizations of the WRCLA, and conform to the requirements set forth by this section. |
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| | PART 2 | PRODUCTS |
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| | 2.1 | MANUFACTURERS |
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| | | A. | Acceptable Manufacturer: Western Red Cedar Lumber Association, which is located at: 1501 - 700 W. Pender St. Pender Place 1, Business Bldg. ; Vancouver, BC, Canada V6C 1G8; Toll Free Tel: 866-778-9096; Tel: 604-684-0266; Fax: 604-687-4930; Email: request info; Web: www.wrcla.org |
| | ** NOTE TO SPECIFIER ** Delete 1 of the next 2 paragraphs; coordinate with Division 1 requirements. |
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| | | B. | Requests for substitutions will be considered in accordance with provisions of Section 01600. |
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| | | C. | Substitutions: Not permitted. |
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| | 2.2 | WRCLA WESTERN RED CEDAR |
| | ** NOTE TO SPECIFIER** Select grade of Western Red Cedar from paragraph below as required for project.
** NOTE TO SPECIFIER** No. 2 and Better Clear grade should be specified when the finest quality rough lumber is required. C and Better Clear is suitable for high-quality landscape structures and as exposed posts and beams in heavy timber construction. D and Better Clear permits larger and more numerous natural characteristics. Some pieces may require trimming to yield clear lengths for the intended use. This grade is widely accepted in the construction of outdoor structures. Appearance Knotty grade has highly restricted wane allowances to give well-defined corners. It contains no holes or other characteristics and is available rough sawn or rougher headed in nominal 2 inch and thicker sizes. Also available with structural grading. Appearance Knotty, structural, should be specified when strength characteristics are required. No. 2 and Better Structural lumber grade is evaluated for structural strength characteristics, intended for engineered applications where strength is more important than appearance. This grade includes pieces meeting the grades of Select Structural, No. 1 Structural and No. 2 Structural. Standard Beams, Posts, and Timbers grade is intended for general construction purposes where serviceability is more important than appearance. No structural values are assigned. |
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| | | A. | Grade: |
| | ** NOTE TO SPECIFIER ** Delete lumber grades not required. |
| | | | 1. | Grade: No. 2 and Better Clear. |
| | | | 2. | Grade: C and Better Clear. |
| | | | 3. | Grade: D and Better Clear. |
| | | | 4. | Grade: Appearance Knotty. |
| | | | 5. | Grade: Appearance Knotty, structural. |
| | | | 6. | Grade: No. 2 and Better Structural. |
| | ** NOTE TO SPECIFIER ** Surface Texture. Delete two of the following three paragraphs. Saw Textured surface is obtained during the milling process using either circular or band saws, is present on all four sides. Rougher Headed texture, receives its texture from a milling process which uses roughened planer knives. The rough texture is clearly visible on all four sides. S4S Texture provides a uniformly sized product and a smooth surface on all four sides for a high quality appearance. Sizes from 2 inches by 4 inches (51mm x 102mm) up to 6 inches by 6 inches (153mm x 153mm) are generally available. |
| | | | 7. | Surface Texture: Saw Textured. |
| | | | 8. | Surface Texture: Rougher Headed. |
| | | | 9. | Surface Texture: Surfaced Four Sides (S4S). |
| | ** NOTE TO SPECIFIER ** Select moisture content. Delete paragraphs not required. |
| | | | 10. | Moisture Content: Green (unseasoned). |
| | | | 11. | Moisture Content: Air-dried. |
| | | | 12. | Moisture Content: Kiln-dried |
| | ** NOTE TO SPECIFIER ** Only Hot-dipped galvanized, aluminum, and stainless steel fasteners should be used to fasten Western Red Cedar decking. Stainless steel fasteners are preferred, hot-dipped galvanized is most widely used and economical. For most applications, No. 304 (18-8) grade stainless steel provides adequate corrosion resistance; for decks exposed to salt air, use No. 316 grade. Other types of fasteners, such as electro-plated, can rust, disintegrate and react adversely with the natural preservatives present in cedar, resulting in stains and streaks. |
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| | 2.3 | FASTENERS |
| | ** NOTE TO SPECIFIER ** Select Nail types required for the project, or delete if nails are not required. |
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| | | A. | Nails: |
| | | | 1. | Material: No. 304 stainless steel. |
| | | | 2. | Material: No. 316 stainless steel. |
| | | | 3. | Material: Hot-dipped galvanized. |
| | | | 4. | Material: Aluminum. |
| | ** NOTE TO SPECIFIER ** Select screw types required for the project, or delete if nails are not required. |
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| | | B. | Screws: |
| | | | 1. | Material: No. 304 stainless steel. |
| | | | 2. | Material: No. 316 stainless steel. |
| | | | 3. | Material: Double Hot-Dipped Galvanized. |
| | NOTE ** Large members require timber connectors other than nails. Bolts, lag screws, split rings and shear plates, and custom made hardware are commonly used in heavy timber structures where the joint strength must be greater than can be achieved with nails. These connectors should be corrosion-resistant or suitably coated to prevent corrosion and staining. |
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| | | C. | Timber Connectors: _______________________________. |
| | ** NOTE TO SPECIFIER ** Delete the following article if no finish or stain is specified. |
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| | 2.4 | PROTECTING FINISH |
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| | | A. | Water repellant, fungus and mildew resistant finish or stain that is resistant to Ultra Violet (UV) light. |
| | ** NOTE TO SPECIFIER ** Select finish color required. Delete one of the following two paragraphs. |
| | | | 1. | Color: Translucent. |
| | | | 2. | Color: ______________ manufactured by ___________________. |
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| | | B. | Follow guidelines of the Western Red Cedar Lumber Association. |
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| | | C. | Adhere to coating manufacturer's instructions. |
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| | PART 3 | EXECUTION |
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| | 3.1 | PREPARATION |
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| | | A. | Coordinate work with related trades; scribe and cope timbers for accurate fit. Allow installation of related work to avoid cutting and patching. |
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| | | B. | Discard timbers that are warped, twisted, bowed, crooked or otherwise defective. |
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| | 3.2 | INSTALLATION |
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| | | A. | Installation will vary based on the project, follow all appropriate building codes and industry best practices. |
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| | | B. | Finish materials on all sides and ends. Apply touch up coating on new cuts. Factory finishing is preferred. |
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| | 3.3 | ADJUSTING AND CLEANING |
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| | | A. | As work proceeds, maintain premises free of unnecessary accumulation of tools, equipment, surplus materials, and debris related to this work. |
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| | 3.4 | MAINTENANCE |
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| | | A. | Explain proper maintenance procedures to owner or owner's representative at project closeout. |
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| | | B. | Visually inspect finish condition. Re-apply coating as necessary. |
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| | | C. | The use of pressure washers is not recommended. |
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| | END OF SECTION |