NOTE ** Western Red Cedar Lumber Association, wood trim.
NOTE **
NOTE ** This section is based on Publication 93-502 Revised June 1997, Specifying Trim Boards, published by the Western Red Cedar Lumber Association (WRCLA), whose head office is at the following address:
NOTE ** 1100/555 Burrard Street
NOTE ** Vancouver, British Columbia V7X 1S7
NOTE ** Tel: (604) 684-0266
NOTE ** Fax: (604) 682-8641
NOTE ** e-mail: WRCLA@cofiho.cofi.org
NOTE ** Website: www.wrcla.org
NOTE ** Western Red Cedar trim on the exterior of residential, commercial, or industrial buildings is compatible with all contemporary cladding materials. It offers the advantages of dimensional stability, longevity, resistance to decay, natural good looks, and the ability to accept a wide range of finishes. It is a good choice for corner boards, fascia, skirting, and window and door trim.
NOTE **
NOTE ** See other WRCLA sections for timber construction and landscape structures, cedar decking, and cedar siding.
NOTE **
NOTE ** SECTION 06221 - WOOD TRIM, Copyright 1998, The Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Select paragraphs below applicable to project; add others as required.
A. Corner boards.
B. Fascia.
C. Skirting.
D. Window trim.
E. Door trim.
F. ____________________________.
1.2 RELATED SECTIONS
NOTE ** Delete sections below not relevant to this project; add others as required.
A. Section 06100 - Rough Carpentry.
B. Section 06139 - Timber Construction.
C. Section 06151 - Cedar Decking.
D. Section _____ - _________________________.
1.3 REFERENCES
NOTE ** Delete references from the list below that are not actually required by the text of the edited section; add others as required.
A. NLGA - National Lumber Grades Authority "Grading Standards."
B. WCLIB - West Coast Lumber Inspection Bureau "Grading Standards."
C. WWPA - Western Wood Products Association "Grading Rules."
D. __________________________________________.
1.4 DELIVERY, STORAGE, AND HANDLING
A. Inspect the materials upon delivery to assure that specified products have been received.
B. Store materials in safe area, away from construction traffic; store under cover and off ground, protected from moisture.
C. Keep materials clearly separated and identified with grade marks legible. Keep damaged material identified as damaged and stored separately.
PART 2 PRODUCTS
2.1 MANUFACTURERS
A. Acceptable Manufacturer: Member of the Western Red Cedar Lumber Association (WRCLA). ASD.
B. Requests for substitutions will be considered in accordance with provisions of Section 01600.
NOTE ** Delete paragraph above or below; coordinate with Division 1 requirements.
C. Substitutions: Not permitted.
D. Provide all wood trim from a single supplier.
2.2 MATERIALS
A. Kiln-Dried Clear Trim Boards: Western Red Cedar graded to meet NLGA "Grading Standards," paragraph 200, and WCLIB "Grading Standards," paragraph 102.
NOTE ** Select grade(s) and surface texture(s) of Western Red Cedar trim boards graded as finish lumber from paragraphs below, as required for project. Delete paragraphs not required for project.
NOTE **
NOTE ** Clear grades have a limited number of natural characteristics and are specified when appearance of the highest quality is required. Clear Heart is the highest grade, including only pieces with heartwood on the exposed face. Many pieces are completely clear, others have minor imperfections that do not detract from the appearance.
1. Grade: Clear Heart.
NOTE ** A Clear grade permits somewhat more imperfections than Clear Heart, but is still restricted to pieces with excellent appearance.
2. Grade: A Clear and Better.
3. Grade: A Clear.
NOTE ** B Clear grade permits slightly larger and more numerous characteristics than A Grade. Occasional pieces may require trimming to yield high grade pieces in shorter lengths. Most often B Clear is supplied as a percentage with A Clear, as indicated in the first subparagraph below; determine and insert the percentage allowable for the project if selecting this method.
4. Grade: A Clear with a percentage of B Clear allowed.
a. B Clear allowed: ________ percent.
5. Grade: B Clear.
NOTE ** S4S Texture provides a uniformly sized product and a smooth surface on all four sides for a high quality appearance.
6. Surface Texture: Surfaced Four Sides (S4S).
NOTE ** S1S2E Texture allows either the rough sawn or surfaced face to be exposed, providing uniform width and thickness tolerances. This is the most popular choice for trim boards.
7. Surface Texture: Surfaced One Side, Two Edges (S1S2E).
B. Unseasoned Clear Trim Boards: Western Red Cedar graded to meet NLGA "Grading Standards," paragraph 202, WCLIB "Grading Standards," paragraph 149, and WWPA "Grading Rules," paragraphs 10.11-13.
NOTE ** Select grade(s) and surface texture(s) of Western Red Cedar trim boards from below, as required for project.
NOTE **
NOTE ** Clear grades have a limited number of natural characteristics and are specified when appearance of the highest quality is required. C and Better Clear grade is for use where appearance is important, such as interior and exterior trim, cabinetry, doors, windows, and similar applications; available unseasoned.
1. Grade: C and Better Clear.
NOTE ** D Clear grade permits slightly larger and more numerous natural characteristics and is used where general utility is more important than appearance; available unseasoned.
2. Grade: D Clear.
NOTE ** Rough Texture provides a rough sawn texture from either circular or band saws, present on all four sides.
3. Surface Texture: Rough.
NOTE ** S1S2E Texture allows either the rough sawn or surfaced face to be exposed, providing uniform width and thickness tolerances. This is the most popular choice for trim boards.
4. Surface Texture: Surfaced One Side, Two Edges (S1S2E).
C. Knotty Trim Boards: Western Red Cedar graded to meet NLGA "Grading Standards," WCLIB "Grading Standards," and WWPA "Grading Rules."
NOTE ** Select grade(s), surface texture(s), and moisture content of Western Red Cedar knotty trim boards from below, as required for project.
NOTE **
NOTE ** Knotty grades present a more rustic appearance than Clear grades. They are available seasoned or unseasoned. Select Knotty grade has sound, tight knots, with other characteristics limited so as not to detract from the end use. Typically, this is available commercially as Select, allowing 10 to 15 percent Quality Knotty in rough or surfaced products.
1. Grade: Select Knotty.
NOTE ** Appearance Knotty grade is proprietary to WRCLA. It is a non-structural product manufactured to meet the appearance trim requirements of quality projects. This material has highly restricted wane allowances to give well-defined corners. It contains no holes or other open characteristics; available rough sawn or rougher headed in nominal 2-inch (50 mm) and thicker sizes.
NOTE **
NOTE ** Upon request, Appearance Knotty trim boards are available with structural grading. Select Appearance Knotty structural lumber when strength characteristics are required; otherwise delete the second subparagraph below.
2. Grade: Appearance Knotty.
3. Grade: Appearance Knotty structural lumber.
NOTE ** Quality Knotty grade natural growth characteristics are not limited as stringently as in Select Knotty. Cross cutting may be required on some pieces to yield tight knotted trim boards.
4. Grade: Quality Knotty.
NOTE ** Standard and Better grade is suitable for exterior construction. Occasional pieces may required trimming to yield suitable quality for the intended end use. Typically supplied as S1S2E surface texture; S4S products may require special ordering.
5. Grade: Standard and Better.
NOTE ** Rough Sawn texture provides a texture from either circular or band saws, present on all four sides.
6. Surface Texture: Rough Sawn.
NOTE ** With Rougher Headed texture, the lumber receives its texture from a milling process which uses roughened planer knives. The rough texture is clearly visible on all four sides.
7. Surface Texture: Rougher Headed.
NOTE ** S4S texture provides a uniformly sized product and a smooth surface on all four sides for a high quality appearance.
8. Surface Texture: Surfaced Four Sides (S4S).
NOTE ** S1S2E texture allows either the rough sawn or surfaced face to be exposed, providing uniform width and thickness tolerances. This is the most popular choice for trim boards.
9. Surface Texture: Surfaced One Side, Two Edges (S1S2E).
NOTE ** Select moisture content from the two subparagraphs below.
10. Moisture Content: Unseasoned.
11. Moisture Content: Seasoned.
D. Fasteners:
NOTE ** Hot-dipped galvanized, aluminum, and stainless steel fasteners can be used to fasten Western Red Cedar. Other types of nails are not recommended as they can rust, disintegrate, and react adversely with the natural preservative oils present in cedar, resulting in stains and streaks. Copper nails also react with cedar and should not be used.
NOTE **
NOTE ** Stainless steel nails are the best choice, especially if the wood is to be finished with transparent or semi-transparent stain. Use No. 304 stainless steel for general applications, No. 316 for seacoast exposures.
NOTE **
NOTE ** Select nail type from subparagraphs below or add other type fasteners. Delete those not required for project.
1. Nails: Hot-dipped galvanized.
2. Nails: Aluminum.
3. Nails: No. 304 stainless steel.
4. Nails: No. 316 stainless steel.
5. _______________________________.
PART 3 EXECUTION
3.1 PREPARATION
A. Coordinate work with related trades; scribe and cope wood trim for accurate fit. Allow installation of related work to avoid cutting and patching.
B. Select trim pieces of longest possible lengths. Ensure that knots and obvious defects will not interfere with placing fasteners or making proper connections. Cut out and discard defects that render a piece unfit to serve its intended function.
C. Discard trim pieces that are warped, twisted, bowed, crooked, or otherwise defective.
3.2 INSTALLATION
A. Install trim square, plumb, and level, closely fitted and securely fastened.
B. Nail pieces to provide penetration of not less than 1-1/2 inches (38 mm) into solid wood. Use straight, ring, or spiral shank nails with thin shanks and blunt points.
3.3 FIELD QUALITY CONTROL
A. Trim work may be rejected, whether or not installed, for excessive warp, twist, bow, or crook, as well as for improper cutting or fitting.
3.4 ADJUSTING AND CLEANING
A. As work proceeds, maintain premises free of unnecessary accumulation of tools, equipment, surplus materials, and debris related to this work.
