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SECTION 07462
CEDAR SIDING
NOTE ** Western Red Cedar Lumber Association, cedar siding.
NOTE **
NOTE ** This section is based on Publication 93-491 Revised
June 1997, Specifying Western Red Cedar Siding,
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 **
NOTE ** Western Red Cedar siding is available in a range of
sizes, patterns, and grades, offering the
advantages of natural beauty, design flexibility,
exceptional dimensional stability, and natural
decay resistance. Its freedom from pitch and resin
makes it an excellent base for a wide range of
finishes.
NOTE **
NOTE ** See other WRCLA sections for timber construction,
cedar decking, and wood trim.
NOTE **
NOTE ** SECTION 07462 - CEDAR SIDING, Copyright 1998, The
Architect's Catalog, Inc.
PART 1 GENERAL
1.1 SECTION INCLUDES
NOTE ** Select paragraphs below applicable to project.
A. Bevel siding.
B. Pattern siding.
C. Board-and-batten siding.
1.2 RELATED SECTIONS
NOTE ** Delete sections below not relevant to this project;
add others as required.
A. Section 06100 - Rough Carpentry.
B. Section 06221 - Wood Trim.
C. 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 SUBMITTALS
A. Submit under provisions of Section 01300.
B. Product Data: Manufacturer's descriptive literature for
siding products, sizes, patterns, and grades.
NOTE ** Bevel, pattern, and board-and-batten cedar siding
provides a variety of styles. Actual appearances
may vary between manufacturers, so choosing a
siding is largely a matter of personal preference,
architectural appearance, and environmental
harmony.
C. Selection Samples: Two sets representing manufacturer's
full range of available sizes, patterns, and grades.
D. Verification Samples: Two samples, minimum 12 inches
long, representing actual pattern and grade of siding to
be installed.
E. Quality Assurance Submittals:
1. Certificates: Evidence of compliance of products to
specified requirements.
2. Manufacturer's Installation Instructions: Detailed
printed instructions for installation of cedar
siding.
F. Closeout Submittals: Printed instructions for
maintaining cedar siding.
1.5 QUALITY ASSURANCE
A. Mock-ups: Supply cedar siding products for mock-ups
specified in sections referenced in INSTALLATION Article
of this section.
1.6 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 cedar siding from a single supplier.
NOTE ** Bevel siding is the most widely used cedar siding.
It is made by resawing lumber at an angle,
producing two pieces thicker on one edge than the
other. One face is saw-textured, the other face
smooth or saw-textured depending on the grade and
customer preference.
NOTE **
NOTE ** Bevel siding is installed horizontally, providing
shadow lines which vary with the siding thickness
selected. It is available in clear and knotty
grades. WRCLA members also produce finger-joined
bevel siding in clear and knotty grades, in lengths
up to 16 feet. The precision-fitted joins are
virtually invisible and stronger than the
surrounding fiber. Select grades and other
features from paragraphs below; delete paragraphs
not required for project.
2.2 CLEAR BEVEL SIDING
A. Kiln-Dried Cedar Siding: Western Red Cedar graded to
meet NLGA "Grading Standards," paragraph 201, and WCLIB
"Grading Standards," paragraph 106.
NOTE ** Select grade(s) and surface texture(s) of clear
cedar bevel siding from paragraphs below, as
required for project. Delete paragraphs not
required for project.
NOTE ** Clear siding provides premium quality appearance,
ideal for prestigious, upmarket installations.
Clear V.G. Heart is the highest bevel siding grade.
All pieces are sawn vertical grain (edge grain),
have a smooth face of decay-resistant heartwood,
and are free from growth characteristics that
affect appearance or performance.
1. Grade: Clear V.G. Heart.
NOTE ** Retain the first subparagraph below if finger-
joined siding is not allowed. Retain the second
subparagraph below if finger-joined siding is
allowed as an installer-option.
a. Solid wood (finger-joined pieces not allowed).
b. Solid wood or finger-joined.
NOTE ** A Clear allows slightly more growth characteristics
than Clear Heart. Pieces are mixed grain (vertical
and flat), graded from the surfaced face.
2. Grade: A Clear.
NOTE ** Retain the first subparagraph below if finger-
joined siding is not allowed. Retain the second
subparagraph below if finger-joined siding is
allowed as an installer-option.
a. Solid wood (finger-joined pieces not allowed).
b. Solid wood or finger-joined.
NOTE ** B Clear allows slightly more numerous and larger
growth characteristics. It is nevertheless highly
serviceable and often yields short lengths of fine
appearance from longer stock.
3. Grade: B Clear.
NOTE ** Rustic bevel siding is recommended for use as
sidewall covering where a rustic saw textured
appearance is desired. It allows limited
characteristics that do not detract from
serviceability.
4. Grade: Rustic Bevel Siding.
NOTE ** Retain the first subparagraph below if finger-
joined siding is not allowed. Retain the second
subparagraph below if finger-joined siding is
allowed as an installer-option.
a. Solid wood (finger-joined pieces not allowed).
b. Solid wood or finger-joined.
NOTE ** Knotty bevel siding is available in three grades,
each in three patterns: Plain Bevel, Rabbetted
Bevel, and Wavy Edge Bevel. Select grades and
other features from paragraphs below; delete
paragraphs not required for project.
2.3 SPECIALTY KNOTTY BEVEL SIDING
A. Specialty Knotty Bevel Cedar Siding:
NOTE ** Architect Knotty(R) grade bevel siding is intended
to be fully usable with the resawn face exposed
after trimming to fit stud wall spacing. It
contains no open characteristics or through
defects, allowing adhesives on the reverse face to
secure knots. Supplied kiln-dried, Architect
Knotty(R) is particularly well-suited for factory
priming or finishing. Architect Knotty(R) is a
registered trademark of the Western Red Cedar
Lumber Association.
1. Grade: Architect Knotty(R).
NOTE ** Select pattern, texture, and finish from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Plain Bevel.
b. Pattern: Rabbetted Bevel.
c. Pattern: Wavy Edge Bevel.
d. Texture: Smooth.
e. Texture: Saw-Textured.
2.4 KNOTTY BEVEL SIDING
A. Knotty Bevel Cedar Siding: Western Red Cedar graded to
meet NLGA "Grading Standards," paragraph 205, and WCLIB
"Grading Standards," paragraph 111.
NOTE ** Select Knotty grade bevel siding contains sound,
tight knots and other natural features. Available
rough or dressed, kiln-dried or unseasoned, smooth
or saw-textured. Shipments usually specify a
percentage of Quality Knotty grade pieces.
1. Grade: Select Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Plain Bevel.
b. Pattern: Rabbetted Bevel.
c. Pattern: Wavy Edge Bevel.
d. Texture: Smooth.
e. Texture: Saw-Textured.
f. Moisture Content: Kiln-dried.
g. Moisture Content: Unseasoned.
NOTE ** Quality Knotty grade bevel siding does not limit
natural growth characteristics as stringently as in
Select Knotty. Cross cutting may be required on
some pieces to yield tight knotted siding.
2. Grade: Quality Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Plain Bevel.
b. Pattern: Rabbetted Bevel.
c. Pattern: Wavy Edge Bevel.
d. Texture: Smooth.
e. Texture: Saw-Textured.
f. Moisture Content: Kiln-dried.
g. Moisture Content: Unseasoned.
NOTE ** Pattern siding describes a variety of siding
products in which the boards have machined edges
and faces to produce interlocking or overlapping
joints and either smooth surfaced or rough sawn
faces. Pattern sidings fall into two groups:
tongue-and-groove and lap.
NOTE **
NOTE ** Tongue-and-groove siding can be installed
horizontally, vertically, or diagonally, each
method giving a distinctly different look. It is
available in clear or knotty grades, with rough or
smooth faces, seasoned (kiln-dried) or unseasoned
(green). Joints between pieces are usually V-
shaped, but flush jointed, reveal, and radius
joints are also available to provide a range of
shadow line effects. Select grades and other
features from paragraphs below; delete paragraphs
not required for project.
2.5 CLEAR TONGUE-AND-GROOVE PATTERN SIDING
A. Clear Tongue-and-Groove Pattern Cedar Siding: Western
Red Cedar graded to meet NLGA "Grading Standards,"
paragraph 200, and WCLIB "Grading Standards," paragraph
102.
NOTE ** Clear Heart grade T&G siding is the highest grade,
including only pieces with heartwood on exposed
faces. Many pieces are completely clear, others
have minor imperfections that do not detract from
their appearance.
1. Grade: Clear Heart.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: V-grooved two sides (EV2S)WRCLA2.
b. Pattern: V-grooved one sides (EV1S)WRCLA1.
c. Pattern: Center matched tongue-and-groove.
d. Pattern: WP-6.
e. Pattern: 102.
f. Pattern: 106.
g. Texture: Smooth faced.
h. Texture: Rough.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Unseasoned.
NOTE ** A Clear grade T&G siding permits somewhat more
imperfections than Clear Heart, but is still
restricted to pieces with excellent appearance.
Often specified as A Clear and Better or A Clear
and Better with a percentage of B Clear allowed;
select grade from three subparagraphs below and
delete the other two.
2. Grade: A Clear.
3. Grade: A Clear and Better.
4. Grade: A Clear and Better with a percentage of B
Clear allowed.
a. B Clear allowed: __________ percent.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
b. Pattern: V-grooved two sides (EV2S)WRCLA2.
c. Pattern: V-grooved one sides (EV1S)WRCLA1.
d. Pattern: Center matched tongue-and-groove.
e. Pattern: WP-6.
f. Pattern: 102.
g. Pattern: 106.
h. Texture: Smooth faced.
i. Texture: Rough.
j. Moisture Content: Kiln-dried.
k. Moisture Content: Unseasoned.
NOTE ** B Clear grade T&G siding permits slightly larger
and more numerous characteristics than A Clear,
often supplied as a percentage with A Clear.
Occasional pieces may require trimming to yield
high grade pieces in shorter lengths.
5. Grade: B Clear.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: V-grooved two sides (EV2S)WRCLA2.
b. Pattern: V-grooved one sides (EV1S)WRCLA1.
c. Pattern: Center matched tongue-and-groove.
d. Pattern: WP-6.
e. Pattern: 102.
f. Pattern: 106.
g. Texture: Smooth faced.
h. Texture: Rough.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Unseasoned.
2.6 KNOTTY TONGUE-AND-GROOVE PATTERN SIDING
A. Knotty Tongue-and-Groove Pattern Cedar Siding: Western
Red Cedar graded to meet NLGA "Grading Standards,"
paragraph 204, and WCLIB "Grading Standards," paragraph
111.
NOTE ** Select Knotty grade T&G siding is available kiln-
dried or unseasoned. Knots are sound and tight.
1. Grade: Select Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: V-grooved two sides (EV2S)WRCLA2.
b. Pattern: V-grooved one sides (EV1S)WRCLA1.
c. Pattern: Center matched tongue-and-groove.
d. Pattern: WP-6.
e. Pattern: 102.
f. Pattern: 106.
g. Texture: Smooth faced.
h. Texture: Rough.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Unseasoned.
NOTE ** Quality Knotty grade T&G siding does not limit
natural growth characteristics as stringently as in
Select Knotty. Cross cutting may be required on
some pieces to yield tight knotted siding.
2. Grade: Quality Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: V-grooved two sides (EV2S)WRCLA2.
b. Pattern: V-grooved one sides (EV1S)WRCLA1.
c. Pattern: Center matched tongue-and-groove.
d. Pattern: WP-6.
e. Pattern: 102.
f. Pattern: 106.
g. Texture: Smooth faced.
h. Texture: Rough.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Unseasoned.
B. Standard Knotty Tongue-and-Groove Pattern Cedar Siding:
Western Red Cedar graded to meet NLGA "Grading
Standards," paragraph 114a, b, and c, and WCLIB "Grading
Standards," paragraph 118-a, b, and c.
NOTE ** Standard and Better knotty grade T&G siding is
suitable for exterior construction. Occasional
pieces may require trimming to yield suitable
quality for the intended end use.
1. Grade: Standard and Better.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: V-grooved two sides (EV2S)WRCLA2.
b. Pattern: V-grooved one sides (EV1S)WRCLA1.
c. Pattern: Center matched tongue-and-groove.
d. Pattern: WP-6.
e. Pattern: 102.
f. Pattern: 106.
g. Texture: Smooth faced.
h. Texture: Rough.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Unseasoned.
C. Proprietary Knotty Tongue-and-Groove Pattern Cedar
Siding:
NOTE ** Proprietary grades of knotty T&G siding are
designed and marketed by WRCLA manufacturers to
meet appearance requirements for cedar sidings and
trim. Check with a WRCLA distributor for grade
designations and detail requirements.
1. Grade: ______________________________.
NOTE ** Insert pattern, texture, moisture content, and
finish in the subparagraphs below.
a. Pattern: ________________________.
b. Texture: ________________________.
c. Moisture Content: ____________________________.
d. Finish: ________________________.
NOTE ** Lap sidings are normally supplied in a variety of
patterns, either green (unseasoned) or dry, in
clear or knotty grades, and with smooth or saw
textured face.
2.7 CLEAR LAP PATTERN SIDING
A. Clear Lap Pattern Cedar Siding: Western Red Cedar graded
to meet NLGA "Grading Standards," paragraph 200, and
WCLIB "Grading Standards," paragraph 102.
NOTE ** Clear Heart grade lap siding is the highest grade,
including only pieces with heartwood on exposed
faces. Many pieces are completely clear, others
have minor imperfections that do not detract from
their appearance.
1. Grade: Clear Heart.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
Channel siding is popular for use whenever a rustic
appearance is desired, the profile of each board
partially overlapping the next board. The channel
created gives shadow line effects, provides
excellent weather protection, and allows for
dimensional movement. It can be installed
vertically, horizontally, or diagonally.
a. Pattern: Channel Siding.
b. Pattern: WP-11.
c. Pattern: 101.
d. Pattern: 105.
e. Pattern: Log Cabin.
f. Texture: Smooth faced.
g. Texture: Saw textured.
h. Moisture Content: Kiln-dried.
i. Moisture Content: Green (unseasoned).
NOTE ** A Clear grade lap siding permits somewhat more
imperfections than Clear Heart, but is still
restricted to pieces with excellent appearance.
Often specified as A Clear and Better or A Clear
and Better with a percentage of B Clear allowed;
select grade from three subparagraphs below and
delete the other two.
2. Grade: A Clear.
3. Grade: A Clear and Better.
4. Grade: A Clear and Better with a percentage of B
Clear allowed.
a. B Clear allowed: __________ percent.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
b. Pattern: Channel Siding.
c. Pattern: WP-11.
d. Pattern: 101.
e. Pattern: 105.
f. Pattern: Log Cabin.
g. Texture: Smooth faced.
h. Texture: Saw textured.
i. Moisture Content: Kiln-dried.
j. Moisture Content: Green (unseasoned).
NOTE ** B Clear grade lap siding permits slightly larger
and more numerous characteristics than A Clear,
often supplied as a percentage with A Clear.
Occasional pieces may require trimming to yield
high grade pieces in shorter lengths.
5. Grade: B Clear.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Channel Siding.
b. Pattern: WP-11.
c. Pattern: 101.
d. Pattern: 105.
e. Pattern: Log Cabin.
f. Texture: Smooth faced.
g. Texture: Saw textured.
h. Moisture Content: Kiln-dried.
i. Moisture Content: Green (unseasoned).
2.8 KNOTTY LAP PATTERN SIDING
A. Knotty Lap Pattern Cedar Siding: Western Red Cedar
graded to meet NLGA "Grading Standards," paragraph 204,
and WCLIB "Grading Standards," paragraph 111.
NOTE ** Select Knotty grade lap siding is available kiln-
dried or unseasoned. Knots are sound and tight.
1. Grade: Select Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Channel Siding.
b. Pattern: WP-11.
c. Pattern: 101.
d. Pattern: 105.
e. Pattern: Log Cabin.
f. Texture: Smooth faced.
g. Texture: Saw textured.
h. Moisture Content: Kiln-dried.
i. Moisture Content: Green (unseasoned).
NOTE ** Quality Knotty grade lap siding does not limit
natural growth characteristics as stringently as in
Select Knotty. Cross cutting may be required on
some pieces to yield tight knotted siding.
2. Grade: Quality Knotty.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Channel Siding.
b. Pattern: WP-11.
c. Pattern: 101.
d. Pattern: 105.
e. Pattern: Log Cabin.
f. Texture: Smooth faced.
g. Texture: Saw textured.
h. Moisture Content: Kiln-dried.
i. Moisture Content: Green (unseasoned).
B. Standard Knotty Lap Pattern Cedar Siding: Western Red
Cedar graded to meet NLGA "Grading Standards," paragraph
114a, b, and c, and WCLIB "Grading Standards," paragraph
118-a, b, and c.
NOTE ** Standard and Better knotty grade lap siding is
suitable for exterior construction. Occasional
pieces may require trimming to yield suitable
quality for the intended end use.
1. Grade: Standard and Better.
NOTE ** Select pattern, texture, moisture content, and
whether rough or dressed from the subparagraphs
below. Delete subparagraphs that do not apply.
a. Pattern: Channel Siding.
b. Pattern: WP-11.
c. Pattern: 101.
d. Pattern: 105.
e. Pattern: Log Cabin.
f. Texture: Smooth faced.
g. Texture: Saw textured.
h. Moisture Content: Kiln-dried.
i. Moisture Content: Green (unseasoned).
C. Proprietary Knotty Lap Pattern Cedar Siding:
NOTE ** Proprietary grades of knotty lap siding are
designed and marketed by WRCLA manufacturers to
meet appearance requirements for cedar sidings and
trim. Check with a WRCLA distributor for grade
designations and detail requirements.
1. Grade: ______________________________.
NOTE ** Insert pattern, texture, moisture content, and
finish in the subparagraphs below.
a. Pattern: ________________________.
b. Texture: ________________________.
c. Moisture Content: ____________________________.
d. Finish: ________________________.
2.9 CLEAR BOARD-AND-BATTEN SIDING
A. Clear Board-and-Batten Cedar Siding: Western Red Cedar
graded to meet NLGA "Grading Standards," paragraph 200,
and WCLIB "Grading Standards," paragraph 102.
NOTE ** Clear Heart grade board-and-batten siding is the
highest grade, including only pieces with heartwood
on exposed faces. Many pieces are completely
clear, others have minor imperfections that do not
detract from their appearance.
1. Grade: Clear Heart.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
NOTE ** A Clear grade board-and-batten siding permits
somewhat more imperfections than Clear Heart, but
is still restricted to pieces with excellent
appearance. Often specified as A Clear and Better
or A Clear and Better with a percentage of B Clear
allowed; select grade from three subparagraphs
below and delete the other two.
2. Grade: A Clear.
3. Grade: A Clear and Better.
4. Grade: A Clear and Better with a percentage of B
Clear allowed.
a. B Clear allowed: __________ percent.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
b. Pattern: Rough sawn.
c. Pattern: Surfaced one side and two edges
(S1S2E).
d. Moisture Content: Kiln-dried.
NOTE ** B Clear grade board-and-batten siding permits
slightly larger and more numerous characteristics
than A Clear, often supplied as a percentage with A
Clear. Occasional pieces may require trimming to
yield high grade pieces in shorter lengths.
5. Grade: B Clear.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
B. Clear Board-and-Batten Cedar Siding: Western Red Cedar
graded to meet NLGA "Grading Standards," paragraph 202b
and c, WCLIB "Grading Standards," paragraph 149-b and c,
and WWPA "Grading Rules," 10.11 and 10.12.
NOTE ** C and Better Clear grade board-and-batten siding is
high-quality lumber for use where appearance is
important.
1. Grade: C and Better Clear.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
d. Moisture Content: Green (unseasoned).
C. Clear Board-and-Batten Cedar Siding: Western Red Cedar
graded to meet NLGA "Grading Standards," paragraph 202d,
WCLIB "Grading Standards," paragraph 149-b and c, and
WWPA "Grading Rules," 10.13.
NOTE ** D Clear grade board-and-batten siding permits
larger and more numerous natural characteristics,
used where general utility is more important than
appearance. Often supplied as D Clear and Better.
Select grade from the two subparagraphs below,
deleting the grade remaining.
1. Grade: D Clear.
2. Grade: D Clear and Better.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
d. Moisture Content: Green (unseasoned).
2.10 KNOTTY BOARD-AND-BATTEN SIDING
A. Knotty Board-and-Batten Cedar Siding: Western Red Cedar
graded to meet NLGA "Grading Standards," paragraph 204
and WCLIB "Grading Standards," paragraph 111.
NOTE ** Select Knotty grade board-and-batten siding
contains sound, tight knots. Other characteristics
are limited so they do not detract from the end use
intended. Typically, this grade is available
commercially as Select, allowing 10 to 15 percent
Quality Knotty in rough or surfaced products.
1. Grade: Select Knotty.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
d. Moisture Content: Green (unseasoned).
NOTE ** Quality Knotty grade board-and-batten siding does
not limit natural growth characteristics as
stringently as in Select Knotty. Cross cutting may
be required on some pieces to yield tight knotted
siding.
2. Grade: Quality Knotty.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Delete subparagraphs that do
not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Moisture Content: Kiln-dried.
d. Moisture Content: Green (unseasoned).
B. Standard Knotty Board-and-Batten Cedar Siding: Western
Red Cedar graded to meet NLGA "Grading Standards,"
paragraphs 114a, b, and c, WCLIB "Grading Standards,"
paragraphs 118-a, b, and c, and WWPA "Grading Rules,"
30.50 (118a, b, and C).
NOTE ** Standard and Better knotty grade board-and-batten
siding is suitable for exterior construction.
Occasional pieces may require trimming to yield
suitable quality for the intended end use.
1. Grade: Standard and Better.
NOTE ** Select pattern and moisture content from the
subparagraphs below. Typically supplied as S1S2E
products; S4S products may require special
ordering. Delete subparagraphs that do not apply.
a. Pattern: Rough sawn.
b. Pattern: Surfaced one side and two edges
(S1S2E).
c. Pattern: Surfaced four sides (S4S).
d. Moisture Content: Kiln-dried.
e. Moisture Content: Green (unseasoned).
C. Proprietary Knotty Board-and-Batten Cedar Siding:
NOTE ** Proprietary grades of knotty board-and-batten
siding are designed and marketed by WRCLA
manufacturers to meet the intended end use. Boards
often represent good value in the no-hole product
range. Check with a WRCLA distributor for grade
designations and detail requirements.
1. Grade: ______________________________.
NOTE ** Insert pattern, texture, moisture content, and
finish in the subparagraphs below.
a. Pattern: ________________________.
b. Texture: ________________________.
c. Moisture Content: ____________________________.
d. Finish: ________________________.
PART 3 EXECUTION
3.1 PREPARATION
A. Coordinate work with related trades; scribe and cope
siding for accurate fit. Allow installation of related
work to avoid cutting and patching.
3.2 INSTALLATION
A. Install siding in accordance with WRCLA recommendations,
closely fitted and securely fastened.
B. Select 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 pieces that are warped, twisted, bowed, crooked,
or otherwise defective.
3.3 FIELD QUALITY CONTROL
A. Siding 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