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1998-06-22
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SECTION 06221
WOOD TRIM
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.
END OF SECTION