1209 BEACH AVE RESA21-0013 wallmanual revision 6-30-21_1Exterior and Interior
U
P
D
A
T
E
D
E
D
I
T
I
O
N
2020 Edition
R
WA L L M A N U A L
Certi-label® Western Cedar shingles and
shakes manufactured by members of the
Cedar Shake & Shingle Bureau® (“CSSB”)
are the only products labeled with the “Certi”
brand name. Certi-label® Western Cedar
shingles and shakes are made by experienced
craftsmen who take pride in their trade and
the quality of their product. Despite their
varying sizes and sometimes remote
locations, member mills are bound together
by a rigid quality code. Unannounced
independent inspections conducted by
accredited third party agencies ensure that
product quality is maintained. Products are
inspected to conform with various local,
national and international codes and
standards (contact the CSSB for specific
details).
All CSSB member product has the mill's
distinctive Certi-label® tucked under the
bundle strap or printed on the carton. Asking
for “the blue label” or “number one blue
label” is not specific enough: CSSB members’
products are the only ones with the “Certi”
brand name on the label.
Certi-label® Products
Certi-label® Western Cedar shingles and
shakes are applied on walls in a different
manner than on roofs. The major point of
difference is in permissible weather
exposures - on walls the maximum weather
exposure is greater than it is on roofs.
A given area of wall, therefore, will require
less material than the same area of roof.
Ask for warranty requirements, including
product labels, before purchasing product. As
usual, always check with your local building
code official for requirements in your area.
Application Notes
Good workmanship is crucial to the integrity
of any sidewall system. Installers should read
this manual carefully and ensure that they
follow proper workmanship practices.
Certi-label® Western Cedar shingles and
shakes are the ideal exterior wall cladding for
new construction and remodeling. They bring
life in the form of beauty, texture, durability,
insulative quality, and low maintenance to
any building. Restyling with Certi-label®
Western Cedar shingles or shakes is easily
accomplished, whether replacing the previous
wall material (re-walling) or applying right
over the existing wall (over-walling).
Material for this manual has been compiled
from various authoritative sources, and many
of the construction methods shown herein
have been developed by the shingle and
shake specialists in both the United States
and Canada. The design and application
details and methods of construction reflect
current good building practice. Other options
are possible but ensure that you check with
your local building code official for approval.
Exterior and Interior Walls
Construction Manual
This manual is intended for use with
Western Red Cedar and Alaskan Yellow
Cedar shingle and shake applications
only. Western Red Cedar products
manufactured by CSSB members are
labeled with the “Certi” brand name.
Alaskan Yellow Cedar products
manufactured by CSSB members are
labeled with “Yellow Cedar” at the top of
their label. For ease of reference this
manual refers to “Certi-label® Western
Cedar” and the term is understood to
include both Western Red Cedar and
Alaskan Yellow Cedar products
manufactured by CSSB members.
INTRODUCTION
Note:
• ONLY experienced professionals who
follow proper safety and workmanship
practices should implement the
information contained herein.
• Refer to www.cedarbureau.org for
project inspiration and photo portfolio.
Note: This manual replaces all previous
versions of the “Design and Application
Manual for Exterior and Interior Walls”
and “Exterior and Interior Wall Manual”.
• Different climates have different code
requirements. Ensure the right products
and installation methods are used per
the building code official in your area.
The information in this manual is not
intended to supersede local building
codes.
• Confirm labels required for warranty
registration before purchasing product.
Ensure details are listed on purchase
order.
Smiros & Smiros Architects, LLP
Brindisi & Yaroscak Custom Builders, Inc.,
Architect: George Dumitru
Top
COVER CREDITS:
Bottom right
Courtesy: Robert A. Cardello Architects;
Photo Courtesy: Dennis Carbo Photography
Bottom left
CONTENTS
Certi-label® Products pages 1-3
Sidewall Fastener
Guidelines pages 6, 7, 8
Exterior Over-Wall and
Re-Wall Construction pages 13, 14
Interior Wall page 15
Construction
Exterior New Wall
Construction pages 4, 5, 9, 10, 11, 12
How to Read a page 21
Certi-label®
Sidewall
Coverage Tables pages 19, 20
Sidewall Finishing pages 17, 18
Sidewall Application
Guidelines page 16
This manual presents best practices developed over more than a century of Cedar Shake and Shingle Bureau (“CSSB”)
history. Please contact CSSB technical staff with Certi-label® product or installation questions. The contents of this
manual are not intended to supersede local jurisdictions requirements or building code. ALWAYS check with your local
code jurisdiction for approval of any installation modifications, including accessory building materials.
Check with building code official for local jurisdiction requirements
CERTI-LABEL® WESTERN CEDAR PRODUCTS
CERTI-LABEL®WESTERN CEDAR SHAKES
Certi-Split Handsplit Shakes®
Certi-Split® Tapersplit Shakes
Certi-Split® Straight-Split Shakes
Certi-Sawn® Tapersawn Shakes
These shakes are sawn both sides. Premium and Number 1 Grades are
the most common. Premium Grade is 100% edge grain, 100% clear and
100% heartwood. Number 1 Grade allows up to 20% flat grain in each
bundle. Number 2 and 3 Grades are also available.
These shakes have split faces and sawn backs. Cedar logs are first cut
into desired lengths. Blanks or boards of proper thickness are split and
then run diagonally through a bandsaw to produce two tapered shakes
from each blank. Available in Premium Grade (100% edge grain) or
Number 1 Grade.
Produced by hand, using a sharp bladed steel froe and a mallet. The
natural shingle-like taper is achieved by reversing the block, end-for-end,
with each split. Premium Grade only.
Produced by machine or in the same manner as tapersplit shakes except
that by splitting from the same end of the block, the shakes acquire the
same thickness throughout. Premium Grade only.
CERTIGRADE®WESTERN CEDAR SHINGLES
Number 2 Red Label
A good grade for many applications. Not less than 10" clear on 16"
shingles, 11" clear on 18" shingles and 16" clear on 24" shingles. Flat
grain and limited sapwood are permitted in this grade.
Number 3 Black Label
A utility grade for economy applications and secondary buildings. Not
less than 6" clear on 16" and 18" shingles, 10" clear on 24" shingles.
Number 4 Undercoursing
A utility grade for undercoursing of double coursed sidewalls only. Not a
roofing material and not to be used as a starter course for roofs.
Number 1 Blue Label®
The premium grade of shingles for sidewalls and roofs. These top-grade
shingles are 100% heartwood, 100% clear and 100% edge grain.
Available in 16" or 18" or 24" lengths.
Note: Western Cedar’s natural color varies.
Tapersawn Red Cedar Shakes
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
Handsplit Red Cedar Shakes
PREMIUM GRADE
PREMIUM GRADE
CEDAR SHAKE & SHINGLE BUREAU
100% Edge Grain
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
CERTI-SPLIT
Handsplit Red Cedar Shakes
CEDAR SHAKE & SHINGLE BUREAU
PREMIUM GRADE
100% Edge Grain
100% Edge Grain
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
CERTI-SPLIT
Handsplit Red Cedar Shakes
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
CERTI-SPLIT
PREMIUM GRADE
100% Edge Grain
- 100% Edge Grain - 100% All Clear -
- 100% Heartwood -
R IGRADECE T
Red Cedar Shingles
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
- Third Grade -
®CERTIGRADE®CERTIGRADE®CERTIGRADE
Red Cedar Shingles
NUMBER GRADE
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
Red Cedar Shingles
1
Check with building code official for local jurisdiction requirements
CERTI-LABEL® WESTERN CEDAR SIDEWALL PRODUCTS
Diagonal Fish-scale Square Arrow Diamond Half Cove Round Octagonal Hexagonal
CERTI-LABEL® WESTERN CEDAR PRODUCTS
CERTI-CUT® SHINGLES These shingles are 5" wide and are manufactured
from 16" and 18" lengths. An 18" length, 96-piece carton will cover 25
square feet at 7 1/2" exposure. Nine of the most popular designs are shown.
Certi-Cut® shingles can also be custom produced to meet individual design
specifications.
Machine grooved shingles are manufactured as a rebutted & rejointed
shingle with one face striated for a length greater than the maximum
exposure. Machine grooved products are for sidewall applications only, and
are remanufactured from 16", 18" and 24" shingles.
Also known as R&R products, these materials have the same specifications as
Number 1 and Number 2 Certigrade® shingles, but they are machine re-
trimmed for parallel edges and with smooth butts sawn at right angles
where a uniform appearance is desired. They are primarily used for sidewall
applications. Rebutted & rejointed shingles are also available with a smooth
sanded face, with the length of the sanded face at a length greater than the
maximum exposure. They are manufactured from 16", 18" and 24" lengths.
Certigrade® Rebutted & Rejointed Shingles
Certigroove® Machine Grooved Shingles
Certi-Cut® Shingles
Sidewall Carton Packaging Example
Full CartonHalf Carton
Mill Name
Address
Telephone
Mill Name
Address
Telephone
Look for the Certi-label®
on the carton.
- 100% Edge Grain - 100% All Clear -
- 100% Heartwood -
CERTIGRADE
Red Cedar Shingles
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
- 100% Edge Grain - 100% All Clear -
- 100% Heartwood -
CERTIGRADE
Red Cedar Shingles
CEDAR SHAKE & SHINGLE BUREAU
THE RECOGNIZED AUTHORITY SINCE 1915
SUMAS, WASHINGTON (604) 820-7700
Note: Roofing products can be used for sidewall applications but
will yield a less even appearance due to increased tolerance
allowances of edges.
2
Check with building code official for local jurisdiction requirements
CERTI-LABEL® WESTERN CEDAR PRODUCTS
CERTI-GUARD
PRESSURE-TREATED FIRE-RETARDANT SHAKES & SHINGLES
CEDAR SHAKE & SHINGLE BUREAU
R
CERTI-GUARD
PRESSURE-TREATED FIRE-RETARDANT SHAKES & SHINGLES
CEDAR SHAKE & SHINGLE BUREAU
R
CERTI-LAST
PRESERVATIVE TREATED CEDAR SHAKES & SHINGLES
CEDAR SHAKE & SHINGLE BUREAU
R
Certi-label® Western Cedar shingle and shake size,
exposure, width of joints, width of product, kiln
versus air-drying process, moisture content and the
local environment will all affect the
expansion/contraction of Certi-label® Western
Cedar sidewall products. These factors should
always be taken into consideration when
Certi-label® Sidewall Application Tips
Certi-Guard® Fire-Retardant Treated Western Cedar Shingles
and Shakes
Number 1 Grades of Certigrade® shingles, and Premium and Number 1
Grades of Certi-Split® shakes and Certi-Sawn® shakes are available
preservative-treated by pressure impregnation process. This product is
ideal in areas of high humidity. Specify the Certi-Last® treating label for
this extra protection. Contact the treatment company for treatment
warranty information, accessory product requirements (including
recommended fastener types) and application details for treated
Western Cedar material.
Number 1 Grades of Certigrade® shingles, and Premium and Number 1
Grades of Certi-Split shakes® and Certi-Sawn® shakes are available
pressure-impregnated treated with fire retardants. Contact the treatment
company for treatment warranty information, accessory product
requirements (including recommended fastener types) and application
details for treated Western Cedar material. Local code jurisdictions may
have additional information regarding applications in specific areas.
Certi-Last® CCA Preservative-Treated Western Cedar Shingles
and Shakes
Pressure-Impregnated Treated Products
Certi-label® products can also be treated. Products are available either
fire-retardant-treated OR preservative-treated. Special care must be
taken to follow the treatment company’s recommended installation
instructions.
determining the installation details and adequate
spacing needed for your specific project. Consult
with your installer and refer to this manual for
more lateral spacing details.
It is suggested that shingles from several job-
specific boxes are blended during the installation
process.
• Once Western Cedar shingles and shakes are pressure-impregnated
treated you must contact the treatment company to determine if a
finish, such as paint or stain or cleaning solution/agent, is allowable.
Note:
• Confirm product labels required for warranty registration BEFORE
purchasing product. Ensure details are listed on purchase order.
3
Check with building code official for local jurisdiction requirements
EXTERIOR NEW WALL CONSTRUCTION
Design and Application Details
The instructions given here are not meant
to supersede local code requirements.
Check with your local building code
official for their preference in your area.
Preparation - Be sure that the walls are
smooth, without protuberances. Nail ends
or points should be removed or pounded
flush.
Corner Boards - Install corner boards
(Figure 8) at this time.
Flashing - Flashings associated with
doors, windows, and penetration details
should be in accordance with local
building code requirements.
Underlayment - The CSSB recommends
No. 30 felt (ASTM D226 Type II or
ASTM D4869 Type IV) underlayment
material. Apply it horizontally, with a
staple gun, starting at the base of the
wall, with a 2" horizontal overlap with
each succeeding course, and a 6" overlap
vertically when starting a new roll. Wrap
the felt underlayment 4" each way
around both inside and outside corners.
Laying Out - Determine the number of
Certi-label® courses by measuring the
height of the wall at the lowest part of the
foundation, from a point 1" below the
top of the foundation, to the top of the
wall. Divide the height into equal parts,
Figure 1: Storypole
corresponding closely to the weather
exposure, but not exceeding the
maximum weather exposure
recommended. Transfer this
measurement and the number of
Certi-label® courses to a storypole
(Figure 1), to lay out courses on all other
walls. Whenever possible butt lines
should align with tops or bottoms of
windows or other openings, and for
appearance the exposure of the final
course at the top should match those
below.
Certi-label® Western Cedar shingle and
shake size, exposure, width of joints,
width of product, kiln versus air-drying
process, moisture content and the local
environment will all affect the
expansion/contraction of Certi-label ®
Western Cedar sidewall products. These
factors should always be taken into
consideration when determining the
installation details and adequate spacing
needed for your specific project. Consult
with your installer and refer to Figure 2:
Spacing Detail.
4
The CSSB recommends installing
over plywood panel or
dimensional lumber sheathing. If
other sheathing materials are
approved for use by your local
building code official, the holding
power of the fasteners should
also be considered carefully.
Check with building code official for local jurisdiction requirements
Figures 3a and 3b: To prevent the wicking of water, which may cause
staining, keep a 1/2" clearance between the first course of Certi-label®
products from all surfaces below.
Figure 3a: Flashing
1/2" clearance to
bottom flashing
Certi-label® Western Cedar wall shingles
Double coursing
Two last courses
over flashing
Metal flashing
Figure 2: Spacing Detail
• Number 1 Grade Certi-label® Yellow Cedar shingles shall be
spaced 3/16 to 5/16 apart (keyways are 3/16 to 5/16 wide)." "" "
• Leave a side lap of at least 1 1/2" between joints in adjacent
courses.
• These joints allow for expansion and prevent possible
“buckling.” For every 4" width of dry Certi-label® Western
Cedar shingle material, the product will expand approximately
1/8". Therefore space keyways accordingly, i.e. 12" shingle is
expected to have approximately 3/8" expansion.
• Number 1 Grade Certi-label® Western Red Cedar shingles
shall be spaced 1/8 to 1/4 apart (keyways are 1/8 to 1/4 " "" "
wide).
SPACING DETAIL
• Allow minimum 1/4" to 3/8" keyway spacing for Number 2
Grade Rebutted and Rejointed Certi-label® Western Red Cedar
shingles.
Figure 3b: Flashing
Metal flashing
Belt trim detail at top
of footing wall
1/2" clearance to
bottom flashing
EXTERIOR NEW WALL CONSTRUCTION 5
Check with building code official for local jurisdiction requirements
SIDEWALL FASTENER GUIDELINES
Each Certi-label® Western Cedar shingle or
shake should be applied with two fasteners.
Nails must be stainless steel Type 316 in
locations within fifteen (15) miles of salt
water. For locations outside the salt water
zone - nails must be stainless steel Type
304, Type 316, or hot-dipped zinc coated
galvanized conforming to a coating weight
2of ASTM A 153 Class D (1.0 oz/ft ). Stainless
steel nails are a better value and offer the
highest degree of corrosion resistance.
Contact the nail manufacturer for further
information to ensure the nails used
comply with listed requirements and are
correct for your application. Minimum nail
lengths are shown in the fastener chart on
page 8. In double course applications, the
exposed Certi-label® Western Cedar
shingle or shake shall be face-nailed with
two nails (as above), driven 2" above the
butt line, and 3/4" from each edge.
Certi-label® Western Cedar shingles wider
than 10" require 1 additional nail driven
near the center of the shingle. Alternatively,
split the shingle into 2 smaller width
shingles.
Nails
Figure 4b: Wide Shingle Fastener Detail
1 2
3
YES
Correct - flush
with surface
NO
Underdriven
NO
Overdriven
Figure 4a: Nail Driving Detail
6
Check with building code official for local jurisdiction requirements
DO NOT USE
ELECTROGALVANIZED (”EG”) FASTENERS
Notes:
Underdriving or overdriving any fastener will affect the integrity of
the Certi-label® Western Cedar sidewall system.
DO NOT USE ELECTROGALVANIZED (EG) FASTENERS. Ensure the
fasteners used comply with listed requirements. Nails are preferred, for
aesthetic reasons, in sidewall application using exposed fasteners.
Some nail manufacturers offer nails specifically for wood shake or
shingle sidewall application. Contact the nail manufacturer for
further information to ensure the fasteners used comply with
listed requirements and are correct for your application.
The CSSB and building code require stainless steel Type 316 fasteners in
locations within fifteen (15) miles of salt water. See details herein for
more specifics.
Pressure Impregnated Treated Shakes and Shingles
®Fasteners used with fire-retardant (Certi-Guard ) or preservative
treated (Certi-Last ) Western Cedar shakes or shingles ®must be
stainless steel Type 316. For specifics on installation, accessory building
materials (flashing, etc.) finishes and maintenance please contact the
treatment company directly.
Ring shank nails are used for better withdrawal resistance and in
designated high wind zone areas.
The information on this page is not meant for sidewall pre-made panel
applications. Please contact the manufacturer for specific panel details.
The information in this manual is not intended to supersede local
building codes.
Two staples should be driven per
Certi-label® Western Cedar shingle or
shake with the staple crowns 7/16"
minimum horizontal, maximum 3/4"
horizontal, to the Certi-label® Western
Cedar shingle or shake butt. Staples are
driven in the same location as nails relative
to the sides and overlapping butt line.
For Certi-label® Western Cedar shingles up
to 10" wide, place two staples in each
shingle 3/4" from each edge. Certi-label®
Western Cedar shingles wider than 10"
require an additional staple driven near the
center of the shingle. Alternately, split the
shingle into 2 smaller width shingles.
Staples
Fasteners should be long enough to
penetrate into the sheathing at least 3/4" or
all the way through and driven flush with
the surface of the Certi-label® Western
Cedar shingle or shake. In all applications,
staples shall be concealed by the course
above.
If you choose to use staples they must be
stainless steel Type 316 in locations within
fifteen (15) miles of salt water. For locations
outside of the salt water zone - stainless
steel staples Type 304 or Type 316 must be
used.
7SIDEWALL FASTENER GUIDELINES
Check with building code official for local jurisdiction requirements
Example of a severely corroded electrogalvanized fastener. Ensure the
correct fasteners are used. Corroded fasteners lead to serious sidewall
system failures as well as unsightly staining.
18" and 24" Tapersawn Shakes 6d Box 2
Certigrade® R&R and Sanded Shingles Type (in)
Certigroove® Shingles Type (in)
16" and 18" Shingles 3d Box 1 1/4
24" Shingles 4d Box 1 1/2
24" Shingles 4d Box 1 1/2
16" and 18" Shingles 3d Box 1 1/4
18" Straight-Split Shakes 5d Box 1 3/4
18" and 24" Handsplit Shakes 6d Box 2
Certi-Split® & Certi-Sawn® Shakes Type (in)
Product Type
24" Tapersplit Shakes 5d Box 1 3/4
Single Course Sidewall Fasteners Double Course Sidewall Fasteners
Product Type
16", 18" and 24" Shingles 5d Box 1 3/4 or
same size casing nails
Certi-Split & Certi-Sawn Shakes Type (in)®®
Certigrade R&R and Sanded Shingles Type (in)®
Certigroove Shingles Type (in)®
16", 18" and 24" Shingles 5d Box 1 3/4
18" Straight-Split Shakes 7d Box 2 1/4 or 8d 2 1/2
24" Tapersplit Shakes 7d Box 2 1/4 or 8d 2 1/2
18" and 24" Handsplit Shakes 7d Box 2 1/4 or 8d 2 1/2
18" and 24" Tapersawn Shakes 7d Box 2 1/4 or 8d 2 1/2
Figure 5: Course Alignment
Centerline of heart
Knot or similar defect
1 1/2"
Nail Type &
Minimum Length
Nail Type &
Minimum Length
SIDEWALL FASTENER GUIDELINES 7SIDEWALL FASTENER GUIDELINES8
Check with building code official for local jurisdiction requirements
DO NOT USE ELECTROGALVANIZED (“EG”) FASTENERS
EXTERIOR NEW WALL CONSTRUCTION
Offset the side joints in any one course at
least 1 1/2" over joints in adjacent
courses (Figure 2).
Because Certi-label® Western Cedar
shingles vary in width there should be
little waste. At corners, or at door or
window frames, you may have to trim a
selected Certi-label® Western Cedar
shingle slightly.
Single Coursing
Use a straight edge, nailing it lightly to the
wall with the edge at the butt line (to
keep courses straight and level). Check
for level every 3 or 4 courses.
Double the starting course at the base of
the wall (Figure 6). For Number 1 Grade
Certi-label® Western Red Cedar shingles
apply with 1/8” to 1/4” keyway space and
for Number 1 Grade Yellow Cedar
shingles, apply with 3/16” to 5/16”
keyway space between the Certi-label®
shingles, giving a pronounced individual
effect to each course.
This wall application features concealed
nailing (Figure 6), with nails driven
approximately 1" above the butt line of
the succeeding course. With Certi-label®
Western Cedar shingles wider than 10",
drive one nail near the center or split
wide shingle into two smaller width
shingles.
The CSSB recommends installing over plywood panel or dimensional lumber sheathing. If other sheathing
materials are approved for use by your local building code official, the holding power of the fasteners should
also be considered carefully. Consider using ring shank nails. Contact local building code official for
substrate (plywood) attachment fastener detail.
The Cedar Shake & Shingle Bureau® recommends that underlayment shall be No. 30 felt conforming to
ASTM D226 Type II or ASTM D4869 Type IV. Check with your local building code official for any questions about
alternative underlayment materials.
Note:
All figures depict shingle applications. DO NOT interlay shingles or shakes with felt on sidewall applications.
Figure 6: Single Coursing
Underlayment
shall be No. 30 felt
conforming to ASTM
D226 Type II or ASTM
D4869 Type IV.The outer course is applied
1/2" lower than the inner
course as a drip course to
help shed water
Enlarged to
show detail
(Figure 6)
Plywood panel
or dimensional
lumber sheathing
9
Check with building code official for local jurisdiction requirements
Underlayment shall
be No. 30 felt
conforming to
ASTM D226 Type II
or ASTM D4869
Type IV.
Plywood panel or
dimensional lumber
sheathing
Undercoursing grade shingles
Concealed nailing
The outer course is applied 1/2" lower
than the inner course as a drip course
to help shed water
EXTERIOR NEW WALL CONSTRUCTION
Double Coursing
To obtain an attractive wall characterized
by wide weather exposures and deep
shadow lines, Certi-label® Western Cedar
shingles and shakes can be applied double
coursed. This method offers economy
because of the wide exposures of the
outer course and the use of less expensive
undercoursing Certi-label® Western Cedar
shingles for the under layer (Figure 7a).
For double coursing exposure details refer
to the chart on page 16.
Undercourse Certi-label® Western Cedar
shingles are fastened at the top with one
nail or staple in the center. The exposed
Certi-label® Western Cedar shingle or
shake is face-nailed with two casing-type
nails, driven approximately 2" above the
butt line, 3/4" from each edge.
Certi-label® Western Cedar shingles wider
than 10" require 1 additional nail and this
nail is driven near the center of the
shingle.
In double coursing, the bottom or starter
course is laid triple with two undercourse
Certi-label® Western Cedar shingles or
one undercourse Certi-label® Western
Cedar shingle over a wood lath and then
the outer course. This gives the bottom
course the same slant as succeeding
courses. All outer courses are applied 1/2"
lower than the undercourse (Figure 7a). A
straight edge can be used to facilitate
placement and nailing of both the
undercourse and exposed course.
The CSSB recommends installing over
plywood panel or dimensional lumber
sheathing. If other sheathing materials
are approved for use by your local
building official, the holding power of
the fasteners should also be considered
carefully.
Figure 7a: Double Coursing
Figure 7b: Dormer Coursing
Double undercoursing
Underlayment shall be
No. 30 felt conforming
to ASTM D226 Type II or
ASTM D4869 Type IV.
Plywood panel or
dimensional lumber
sheathing
Apply nails in straight line approximately 2"
above shingle butts
10
Note: Cutting the shingle at the bottom
avoids bulging or sidewall getting thicker
with each adjacent course.
Corner trim
Step flashing
Rafter
Fascia board
Note: Consult your local building code official about
the size and height (min 3”) of the step flashing
Level reference line
To mark top of next course
measure top down from
the reference line
1/2"
The outer course is applied
1/2" lower than the inner course
as a drip course to help shed water
Number 3 or undercoursing grade Certi-label®
Western Cedar shingles
Cut the bottom of the dormer wall
undercoursing shingle to reduce
“bulging” (each successive course
gets thicker) Top layer should
extend1/2" past the undercoursing
Cut the bottom of the shingle
to maintain equal butt thickness
with previous shingle in line
Check with building code official for local jurisdiction requirements
EXTERIOR NEW WALL CONSTRUCTION
Neatly fitting inside or outside corners
are easily made. It is standard practice to
lace outside corners (Figure 8e). On wide
exposures this method requires small
nails near the Certi-label® Western
Cedar shingle butts to tighten and hold
the lapped corners. For these corners use
only nails that are corrosion resistant. In
double course applications, the exposed
Certi-label® Western Cedar shingle or
shake shall be face-nailed with two hot-
dipped galvanized or stainless steel
casing nails, driven 2” above the butt line,
and 3/4” from each edge. Certi-label®
Western Cedar shingles wider than 10”
require 1 additional nail driven near the
center of the shingle. Corner boards also
can be used to advantage by nailing a
1" x 4" cedar board to a 1" x 3" cedar
board, then attaching the preassembled
corner to the building (Figure 8a).
Corners
It is good practice to use flashing behind
Certi-label® Western Cedar shingles or
shakes at the inside and outside corners.
They may be butted against a square
wood strip (Figure 8b), or they may be
fitted one course to the other (Figure 8d).
When the latter method is used, courses
must be completed on each wall
progressively, and can be best applied by
working from the corners while
alternately fitting one course to the other.
(Figure 9).
a) Certi-label® Western Cedar shingles butted
against corner boards
b) Certi-label® Western Cedar shingles butted
against square wood strip, flashing behind
Figure 8c
1" x 4"
1" x 3"
Figures 8a-8e: Corner Option Details
c) Mitered corner
d) Laced inside corner with flashing
behind inside strip on corner
e) Alternated laced outside corner
Figure 9: Fitting Laced Corner Courses
Figure 8a Figure 8b
Figure 8d Figure 8e
11
Check with building code official for local jurisdiction requirements
It is preferred practice to
install inside/outside corner
flashing to safeguard against
the cracking or tearing of
No. 30 felt (ASTM D226 Type II
or ASTM D4869 Type IV)
underlayment at these corners.
EXTERIOR NEW WALL CONSTRUCTION
Staggered butt applications are made by
shortening the exposure less than the
greater maximum exposure. No
Certi-label® Western Cedar shingles or
shakes shall be applied greater than the
maximum exposure allowed. Check with
your local building code official for
approval of the staggered butt coursing
installation method.
Design and Application Instructions
Staggered Butt Coursing
For single course application, an attractive
effect can be made by staggering the butt
of the Certi-label® Western Cedar shingle
from the horizontal line. Apply the
Certi-label® Western Cedar shingle
irregularly at variable distances below
(but not above) the horizontal line.
Ribbon Coursing
A double shadow line effect can be
obtained by raising the outer course
Certi-label® Western Cedar shingles
approximately 1" above the
undercoursing. Use Number 1 Grade
Certi-label® Western Cedar shingles for
undercoursing when applying ribbon
coursing (Figure 11).
Note: Butt nail all double coursed Certi-label®
Western Cedar Sidewall shingles that are exposed
more than their maximum single course exposure.
Figure 10: Staggered Coursing
Double starter course
Plywood panel
or dimensional
lumber sheathing
Plywood panel
or dimensional
lumber sheathing
Figure 11: Ribbon Coursing
The outer course is applied 1/2" lower
than the inner course as a drip course
to help shed water
Double starter course
Finished course
Underlayment shall
be No. 30 felt
conforming to
ASTM D226 Type II
or ASTM D4869
Type IV.
Underlayment shall
be No. 30 felt
conforming to
ASTM D226 Type II
or ASTM D4869
Type IV.
1" maximum for 16" &18" Certi-label®
Western Cedar shingles
12
The outer course is applied 1/2" lower
than the inner course as a drip course
to help shed water
1 1/2" maximum for 24"
Certi-label® Western
Cedar shingles
Apply nails in straight
line approximately 2"
above shingle butts
Check with building code official for local jurisdiction requirements
EXTERIOR OVER-WALL AND RE-WALL CONSTRUCTION
Figure 12: Typical Window and Door Casing Detail
Figure 13: Over Beveled Siding Detail
Ensure that the first course is properly
attached. All Certi-label® Western Cedar
shingle and shake product installation
must meet nailing and exposure
guidelines as detailed in this manual. It
may be necessary to add occasional
nailing strips.
Over Beveled Siding - Applying a new
Certi-label® Western Cedar shingle or
shake wall over old beveled siding can be
accomplished in either of two ways: 1) By
filling in the low points of the wall with
low grade lumber or plywood strips
(called horse feathers) of appropriate
thickness and thereby increasing the
potential nailing surface, or 2) by nailing
the Certi-label® Western Cedar shingles
or shakes to the high points of the bevels
of each course of the old wall, or of
alternate courses [provided it does not
result in weather exposure greater than is
recommended (Figure 13)].
Over-walling
Design and Application Instructions
Re-walling
Once the old exterior wall material has
been removed and the old nails or other
protrusions cleaned away, the new wall
can be applied. No. 30 felt (ASTM D226
Type II or ASTM D4869 Type IV)
underlayment should be applied since it is
new construction.
Applying Certi-label® Western Cedar
shingles or shakes right over an old wall -
whether wood, brick, stucco, or synthetic
products - is easily done. It saves time
involved in both removing the old exterior
and in disposing of it. However, avoid
nailing over vinyl or aluminum as they are
not sufficiently strong to provide a proper
support.
First, nail moulding strips on the face of
existing window and door casings, flush
with the outer edges. The Certi-label®
Western Cedar shingles or shakes are then
joined to the mouldings (Figure 12).
2. The integrity of the original flashing is to be utilized. Additional trim
is considered to be decorative only. If the original window does not
have good structural integrity, it must be removed and a new one
installed. New casings are to be installed as part of proper wall
construction as shown throughout this manual.
1. Apply new casing to bring Certi-label® Western Cedar shingles or
shakes flush with surface
2
Furring if required
1
Double starter course
13
Check with building code official for local jurisdiction requirements
1" x 3" or 1" x 4" nailing strips spaced
according to exposure of Certi-label®
Western Cedar shingles or shakes,
regardless of single or double course.
Figure 14: Over Masonry or Foam Sheathing Detail
Double starter course
Figure 15: Over Stucco Detail
Double starter course
Over Stucco - Nailing strips should be
attached with nails long enough to
penetrate the stucco and the underlying
sheathing. Do not apply directly to the
stucco, which is too weak to provide a
proper support. If the old stucco is
removed, new No. 30 felt (ASTM D226
Type II or ASTM D4869 Type IV)
underlayment is then applied to the
walls, and the shingling can proceed as in
new construction (Figure 15).
Over Masonry or Foam Sheathing -
Masonry walls are easily covered, by
vertically furring the walls and applying
nailing strips (1" x 3" or 1" x 4") spaced
according to the exposure and
single/double course product design.
When installing over masonry, the nailing
strips should be fastened with special
nails, driven between the bricks or blocks,
so that the outer shingled wall will be
firmly attached.
When installing over foam sheathing,
vertical spacers shall be attached with
fasteners long enough to penetrate
through the foam sheathing and the
underlying wood sheathing. Do not apply
only to the foam sheathing as it is too
weak to provide proper support.
(Figure 14).
EXTERIOR OVER-WALL AND RE-WALL CONSTRUCTION14
Check with building code official for local jurisdiction requirements
INTERIOR WALL CONSTRUCTION
Figure 16: Furring Strip Detail
Figure 19: Top Course
Figure 18: Corner Detail
Figure 17: Starter Course
Certi-label® Western Cedar shingles or
shakes can be readily applied over almost
any interior wall surface, including wood,
brick, plaster, or concrete. Nails, staples, or
glue may be used as fasteners on interior
wall projects. Certi-label® Western Cedar
shingles or shakes may be attached directly
to the interior wall providing it has
sufficient holding qualities to support the
fasteners. If this is not the case, they may
be applied over spaced furring strips, which
are fastened to the wall by nails or glue. As
a general rule, the furring strips should be
placed a distance apart equal to the desired
exposure.
Certi-label® Western Cedar shingles or
shakes are building materials that adapt
easily to many different structural forms.
Their use in interiors is practically
unlimited, and a wide variety of imaginative
effects can be achieved.
Calculate the number of courses by
dividing the wall height (minus the height
of the base board, if any) by the desired
exposure. Mark the positions of the nailing
strips on a furring strip, then transfer these
measurements to the wall. Fasten 1" x 2" or
1" x 3" furring strips to the wall (e.g. by
nailing them through the wall into the
studs) at the positions marked. If the
Certi-label® Western Cedar shingles or
shakes are to be carried around the corner,
make sure the furring strips line up
(Figure 16).
Design and Application Details
Start with a double course at the bottom of
the wall. Use two nails or staples in each
Certi-label® Western Cedar shingle or
shake placed so that the nail heads will be
covered by the next course. The outer layer
should overlap and conceal the side joints
of the first course (Figure 17). Continue
with single courses to the top of the wall. A
straight edge tacked to the wall will keep
the courses true and the exposure
consistent. Alternately overlap the
Certi-label® Western Cedar shingles or
shakes on the outside corner to give a
“laced” effect, then trim them flush with a
block plane (Figure 18).
The interior Certi-label® Western Cedar
shingles or shakes can now be finished to
suit almost any taste. Contact a reputable
finish manufacturer for more details.
Cut the Certi-label® Western Cedar
shingles or shakes for the last course and
discard the thin end. Glue or nail the last
course in place to make a neat top edge. A
moulding strip may be applied to cover nail
heads and hide any irregularities in the
ceiling (Figure 19).
15
Check with building code official for local jurisdiction requirements
SIDEWALL APPLICATION GUIDELINES
7. Certi-label® Western Cedar shakes on
sidewalls shall be spaced 3/8" to 1/2"
apart.
6. Joints of Certi-label® Western Cedar
shingles/shakes in any one course
shall be offset not less than 1 1/2"
from the joints in adjacent courses.
5. Number 1 Grade Certi-label®
Western Red Cedar sidewall shingles
shall be spaced apart 1/8" to 1/4";
Yellow Cedar shingles shall be spaced
3/16" to 5/16".
4. Certi-label® Western Cedar sidewall
shingles/shakes shall be (doubled or
tripled) at foundation lines.
Fastening Sidewall Shingles/Shakes
8. Certi-label® Western Cedar sidewall
shingles/shakes shall be applied with
a weather exposure of (specify in
inches from exposure chart).
Sidewall Application
Note: Number 2 Grade Certi-label®
Western Red Cedar shingles shall be
spaced 1/4" to 3/8" apart.
9. Fasteners should be long enough to
penetrate into the sheathing at least
3/4" or all the way through and driven
General Application Notes
1. The contractor shall cover all wall
surfaces with Certi-label® Western
Cedar shingles or shakes bearing the
Cedar Shake & Shingle Bureau’s®
official grade marked label.
2. Certi-label® Western Cedar shingles/
shakes for outer courses shall be
(specify grade and length).
3. Certi-label® Western Cedar shingles/
shakes for undercourses shall be
(specify grade and length).
Maximum Sidewall Exposure Chart
Certi-label® Western Cedar Product Grade Single Course Double Course
18" Straight Split Shakes 1 8" 16"
24" Handsplit Shakes 1 10 1/2" 18"
18" R&R, sanded, Certigroove® Shingles 1 8" 14"
16" R&R, sanded, Certigroove® Shingles 1 7" 12"
Certi-Split®
16" Shingles 1 7" 12"
Certigrade®
18" Handsplit Shakes 1 8" 14"
24" Tapersplit Shakes 1 10 1/2" 18"
Certi-Sawn®
18" Shingles 1 8" 14"
24" Shingles 1 10 1/2" 16"
24" R&R, sanded, Certigroove® Shingles 1 10 1/2" 16"
18" Tapersawn Shakes 1 8" 14"
24" Tapersawn Shakes 1 10 1/2" 18"
Number One Grade Products
Number Two Grade Products
18" Tapersawn Shakes 2 7" 10"
24" R&R, sanded Shingles 2 9" 14"
18" Shingles 2 7" 10"
24" Shingles 2 9" 14"
24" Tapersawn Shakes 2 9" 14”
16" R&R, sanded Shingles 2 6" 9"
Certi-Sawn®
18" R&R, sanded Shingles 2 7" 10"
16" Shingles 2 6" 9"
Certigrade®
16
Check with building code official for local jurisdiction requirements
flush with the surface of the
Certi-label® Western Cedar shingle
or shake. In all applications, staples
shall be concealed by the course
above. Fasteners cannot be
electrogalvanized as they will corrode
and cause staining. For aesthetic
reasons, nails are preferred for
sidewall applications.
Note: Due to the diverse range of
fastener requirements, please refer to
pages 6-8 for fastener specifications.
SIDEWALL FINISHINGSIDEWALL FINISHINGSIDEWALL FINISHING
7. Material Safety Data Sheet
10. Exterior/Interior finish usage
Exterior Finishes (also known as
Coatings)
3. Qualified finish contractors in your area
4. Certi-label® Western Cedar moisture
content level recommended for your
specific locale
8. Mildew resistance
Please note: A detailed product finishing
discussion is beyond the scope of this
manual; however, a brief overview is
presented below. It is critical to read the
instructions on the finish product’s
container as well as follow the finish
manufacturer’s directions. All areas of the
world present unique painting/staining
challenges. Some of the topics you should
discuss with your sidewall product
manufacturer, finish manufacturer, and
professional contractor include the
following:
2. Surface preparation
There are a variety of paints, stains, and
preservative treatments available for
Certi-label® Western Cedar sidewall
products. Certi-label® sidewall products are
available pre-finished, (pre-primed or pre-
stained) and natural (unfinished).
6. Drying color versus sample chip color
9. UV resistance and water repellency
11. Depth of finish penetration
5. Appropriateness of finish for Certi-label®
Western Cedar sidewall products
1. Product coverage
Semi-transparent and semi-solid stains
(penetrating oil-based): have some pigment,
but allow some wood grain to show.
12. Application method, including how to
cover all sides of product, mixing/stirring
(to prevent lap marks), temperature,
brush versus spraying tools, and
recommended proper clean up and
disposal of all tools, brushes and rags.
Talk to your finish manufacturer if you
have questions about back-priming
instructions for your particular project.
13. Price. Do not be fooled by a low price.
Better quality brands tend to be more
expensive. A cheap finish will usually cost
more in the long run through quicker
weathering, poorer coverage and less
pigment. Use only the highest quality
products from your finish manufacturer.
Quality finish manufacturers have
technical help lines you can call (some
are toll-free). Advice is also available via
the Internet.
The CSSB Recognizes these General
Types of Finishes:
Transparent finishes (penetrating oil-based):
clear, allow natural grain to show through,
may also include paintable water repellant
preservatives. Such treatment can possibly,
depending upon the product, inhibit mildew
growth as well as rapid change in color due
to weathering.
Paint or solid stain: provide opaque
coverage, allowing little to no wood grain to
show.
Certi-label® Western Cedar
Sidewall Finishing Systems:
Preferred Paint System
OR
Step 2: Field-applied top coat of highest
quality 100% acrylic latex paint. This type of
top coat is more flexible and more resistant
to blistering and cracking. The best
protection against extractive bleeding is the
application of an oil-based, stain- blocking
primer before the top coat is applied.
Step 1: Factory or field applied alkyd oil or
latex stain blocking primers on all surfaces.
Less Durable Paint System
Step 2: Field-applied oil-based or alkyd top
coat.
Stains
Use oil-based stains only. CSSB member
manufacturers can factory-apply a coat of
semi-transparent or semi-solid oil-based
stain. This process is usually more cost-
effective than on-site staining. Further
enhancing the natural durability of
Certi-label® Western Cedar shingles and
shakes, some CSSB members offer pass-
through finish warranties on their factory
finished sidewall shingles and shakes. These
can be further enhanced by application of a
final, field-applied top coat. Contact
participating CSSB members for details.
To Accelerate the Weathering
Process
CSSB member manufacturers do supply
factory-primed products. These products are
usually more cost-effective than on-site
priming.
To hasten the weathering process, apply a
bleaching oil finish.
Step 1: Factory or field applied alkyd oil or
latex stain blocking primers on all surfaces.
17
Check with building code official for local jurisdiction requirements
Additional information on finishing as well as cleaning/maintenance can be found at www.cedarbureau.org
SIDEWALL FINISHING
There are products that claim to be
effective for removing dirt, airborne
pollution marks, mildew and prior
finishes. If you clean the surface prior to
finishing, ensure that it is allowed to dry to
the finish manufacturer's recommended
moisture content level before applying a
new finish. Contact your finish
manufacturer for more details.
Generally finish products IMMEDIATELY
after installation PROVIDING that the
moisture content is appropriate for both
the finish product being used and your
locale. If the finish is not applied promptly,
adhesion will be compromised (unless
additional surface preparation is
undertaken).
If you have installed a natural product
(unfinished), apply your finish before rain
and other moisture are absorbed. Ensure
that you account for high humidity
concerns.
In all instances drying time varies from
region to region. Excessive moisture will
limit finish adhesion. Check with your
professional contractor, finish
manufacturer and/or sidewall product
manufacturer for assistance.
If you are using a pre-finished product
(where finish is applied at the
manufacturing plant), ensure that the
product is thoroughly dried before
applying a top finish coat.
Surface Cleaning
How Soon to Finish Extractive Bleeding
Extractive bleeding is characterized by the
tannins in the wood being dissolved in
moisture and migrating to the surface of
the product. Rain will sometimes wash
these stains away; however if left to
weather, the sun can cause
polymerization, requiring the addition of a
tannin blocker and new top coat of finish
(ensure proper surface preparation before
applying new top coat) once the moisture
problem has been solved. Compounds
containing oxalic acid appear to be the
most effective at removing extractive
bleeding stains: ensure you use proper
safety precautions and follow the oxalic
acid compound manufacturer’s
application directions.
Extractive bleeding does not signify failure
of the applied finish, but instead is found
in applications where a source of moisture
is present. Extractive bleeding is not a
manufacturing defect nor is it a finish
defect; it is a natural phenomenon that
occurs in applications. Tannin blocking
products help, however, the CSSB does
not provide any finish warranty. Check
with your sidewall product manufacturer,
finish manufacturer, and professional
contractor for more assistance.
The CSSB does not warrant this
information or instruction regarding
finishes. If you see an attractive job that
has endured in your locale, inquire about
the type of finish used.
Once ® Western Cedar Certi-label
shingles and shakes are pressure-
impregnated treated you must contact
the treatment company to determine if
a finish, such as paint or stain, is
allowable. If there is any confusion
whatsoever it is highly recommended
that you contact both your sidewall
product manufacturer and the finish
manufacturer.
18
Check with building code official for local jurisdiction requirements
Additional information on finishing as well as cleaning/maintenance can be found at www.cedarbureau.org
3½" 4" 4½" 5" 5 ½" 6" 6 ½" 7" 7½" 8" 8½" 9" 9 ½" 10"
– 72½ 81½ 90½ 100 109 118 127 136 145½ 154½ 163½ 172½ 181½
70 80 90 100 110 120 130 140 150 160 170 180 190 200
– – – – 73½ 80 86½ 93 100 106½ 113 120 126½ 133
Approximate coverage, in square feet, of one square (4-bundle roof-pack) of shingles, applied at indicated weather exposures. (Some
exposures on this chart are not acceptable for single course application. Consult the maximum exposure table on page 16 for more details).
24" x 4/2"
16" x 5/2"
18" x 5/2¼"
Length and Thickness
Exposure
Certigrade Shingles® - Coverage (Number 1 Grades)
SIDEWALL COVERAGE TABLE
• Mills pack in 1/2 carton and full carton sizes. Check with
your supplier for more details.
• Cartons are made of cardboard, and must be kept dry.
• CSSB member product will be labeled with the Certi-label®
on the carton.
• Before starting please read the instructions printed on
the carton.
• Remember to deduct window and door areas from coverage
calculations.
Product Coverage Calculations
Ensure you have the following information:
1. Size of wall area you are trying to cover, measured in
square feet.
• Sidewall squares are calculated in a different manner than roof
squares. The number of cartons in a square depends upon the
product type. Check with your supplier for more details.
2. Application method and exposure to be used
3. Product type used
4. Amount of product in each box (packaging)
Your supplier will be glad to assist you. As usual, always check
with your local building official for requirements in your area.
Sidewall Shingle PackagingCoverage Guidelines
Approximate coverage, in square feet, of one square (4-bundle roof-pack) of shingles, applied at indicated weather exposures. (Some
exposures on this chart are not acceptable for single course application. Consult the maximum exposure table on page 16 for more details).
10½" 11" 11½" 12" 12½" 13" 13½" 14" 14½" 15" 15½" 16"
210 220 230 240 – – – – – – – –
191 200 209 218 227 236 245½ 254½ – – – –
140 146½ 153 160 166½ 173 180 186½ 193 200 206½ 213
16" x 5/2"
18" x 5/2¼"
24" x 4/2"
Length and Thickness
Exposure
Certigrade Shingles® - Coverage (Number 1 Grades), continued
Approximate coverage, in square feet, of one single-carton sidewall square of machine grooved shingles, rebutted & rejointed shingles, and
sanded face shingles applied at indicated weather exposures. (Some exposures on this chart are not acceptable for single course application.
Consult the maximum exposure table on page 16 for more details).
Length
Exposure
4 carton
wall square
Certigroove® Shingles/Rebutted & Rejointed Shingles - Coverage (Number 1 Grades)
37 44 50 56 62 69 75 81 87 94 100
74 88 100 112 124 138 150 162 174 188 20024”
18" 43 50 57 64 72 79 86 93 100 – –
24"
6" 7" 8" 9" 10" 11" 12" 13" 14" 15" 16"
16" 50 59 67 76 84 93 100 – – – –
2 carton
wall square
19
Check with building code official for local jurisdiction requirements
CHECK WITH YOUR SUPPLIER
FOR MORE DETAILS
SIDEWALL COVERAGE TABLE
Certi-Split® Shakes - Coverage (Number One or Premium Grades)
Starter Course: Underlying course can be the Number 1 Grade product used on outer course or a lower grade product.
18" x 3/8" True-Edge Straight-Split (4 bundle square) 50 60 71 82 100 – –
18" x 1/2" Handsplit-and-Resawn Mediums 70 85 100 115 140 – –
24" x 1/2" Handsplit-and-Resawn Mediums 70 85 100 115 140 160 180
24" x 3/4" Handsplit-and-Resawn Heavies 70 85 100 115 140 160 180
24" Tapersawn 70 85 100 115 140 160 180
24" x 1/2" Tapersplit 70 85 100 115 140 160 180
18" x 3/8" Straight-Split (5 bundle square) 82 100 118 135 165 – –
18" x 3/4" Handsplit-and-Resawn Heavies 70 85 100 115 140 – –
7" 8 1/2" 10" 11 1/2" 14" 16" 18”
18" Tapersawn 70 85 100 115 140 – –
24" x 3/8" Handsplit & Resawn 70 85 100 115 140 160 180
24" x 3/8" Straight-Split 70 85 100 115 140 160 180
Shake Type, Length and Thickness
Exposure
• Shakes are packaged in bundles, secured with a metal
strap. Each bundle will have a Certi-label® underneath.
For example: 18" shake bundles, 12/12 pack, 5 bundles,
should cover 100 square feet at 7 1/2" exposure.
9/9 pack, 5 bundles, should give 75% coverage of a
square at 7 1/2" exposure. When ordering check with your
supplier to confirm bundle size.
• While most 18" shakes are packed in bundles of 12
courses each side (12/12) they may be packed 9/9. This
will alter the number of bundles required to cover
1 square. Check with your supplier for more details.
Sidewall Shake PackagingCoverage Guidelines
• Sidewall squares are calculated in a different manner
than roof squares.
Product Coverage Calculations
Ensure you have the following information:
1. Size of wall area you are trying to cover, measured in
square feet.
3. Product type used
• Remember to deduct window and door areas from
coverage calculations.
2. Application and exposure to be used
4. Amount of product in each box or bundle
Your supplier will be glad to assist you. Ask for warranty
requirements including product labels before purchasing
product. As usual, always check with your local building
official for requirements in your area.
Approximate coverage, in square feet, of one square of shakes applied at indicated weather exposures. (Some exposures on
this chart are not acceptable for single course application. Consult the maximum exposure table on page 16 for more details).
Please note: 1) Handsplit shakes are also known as Handsplit-and-Resawn shakes.
2) Do not interlay shakes or shingles with felt on sidewall applications.
20
Check with building code official for local jurisdiction requirements
CHECK WITH YOUR SUPPLIER
FOR MORE DETAILS
2020 404
030640
PERFECTION
Red Cedar Shingles
HOW TO READ A CERTI-LABEL®
9. Cedar Bureau Label Number
10. Building Code Compliance Numbers
11. Product Performance Tests Passed
12. Label Identification Number
13. UPC Code
14. Coverage Chart and Recommended Exposure
15. Application Instructions on Reverse Side
1. The ”Certi” Brand Name - Your Quality Assurance
2. Product Type
5. This Number Shows Compliance with Total Quality
Manufacturing System
6. Mill Name, Location and Phone Number
7. Industry Product Description
8.Product Dimensions
rd 4. Independent, 3 Party, Quality Control Agency
5
2
7
6
8
14
15
10
11
12
13
9
1
3
4
21
3. Product Grade
March 2020 Edition
Printed in Canada
This manual shows Cedar Shake & Shingle Bureau® recommended procedures as of the manual’s
print date. It is advisable to contact the Cedar Shake & Shingle Bureau® to ensure that you are using
the latest available information.
Cedar Shake & Shingle Bureau®, the CSSB logo® (”C” with shingles/shakes), Blue Label®,
Certigrade®, Certigroove®, Certi-Cut®, Certi-Guard®, Certi-label®, Certi-Last®, Certi-Ridge®,
Certi-Sawn®, Certi-Split®, Certi-Wood®, Envirosmart® and The Crowning Touch of Quality & Design®
are all registered trademarks of the Cedar Shake & Shingle Bureau®.
Contact us for more information:
US Address
PO Box 1178
Sumas, WA
98295-1178
Canadian Address
R
CEDAR SHAKE & SHINGLE BUREAU® HISTORY
On June 9, 1915, at a meeting of the Trustees
of the West Coast Lumber Manufacturers
Association, it was agreed to establish a
branch of the association to serve those
members who manufactured shingles. Our
influence grew, and as we survived both the
Great Depression and World War II,
manufacturers continued their quality
commitment. In 1963, the organization
merged with the Handsplit Shake Bureau to
become the Red Cedar Shingle & Handsplit
Shake Bureau.
Each year the CSSB’s staff answer thousands
of technical questions and product selection
queries. Our proud history, quality reputation
and dedicated members provide excellent
Certi-label® cedar shake and shingle roofing
and siding products.
Manufacturers’ product lines continued to
broaden and, in 1988, the members changed
the organization’s name to the Cedar Shake &
Shingle Bureau® (”CSSB”). In the late 1980s,
mill quality control inspections were
subcontracted to independent, third party
quality control agencies.
1920s: Chief Inspector Fred Monte inspecting product
V2S 1G7
300 – 34334 Forrest Terrace
Abbotsford, BC
TEL: 604-820-7700
FAX: 604-820-0266
www.cedarbureau.org
info@cedarbureau.com