Certi-Sawn™ Taper Sawn Cedar Shakes
 Number 1 Grade
Description - Lengths 18 inch, 24 inch; width 4" minimum, 14" maximum; thickness
5/8" nominal (5/8" to 1", yet uniform in each bundle or pallet). Face 100%
clear. Flat grain 10% maximum, cross grain minimum allowed.
Roof Exposure - 10" for 24 inch shake; 7½" for 18 inch shake.
Wall exposure - Single course: 11½" for 24 inch shake; 8½" for
18 inch shake.
Double course: 18" for 24 inch shake; 14" for 18 inch shake.
Recommended Use - For walls or roofs on 4:12 pitch and steeper where
a high quality, durable and uniform appearance is desired.
Starter-finish Course - Length 15 inch. For use on the underlying
starter course at eave lines and for the final course at ridges where
trimming would otherwise be necessary and full-length shakes are not
needed.
Premium Grade
Description - Same as No. 1 Grade, 100% edge grain. All other descriptions
from No.1 Grade apply.
 Number 2 Grade
Description - Lengths 18 inch, 24 inch; width 3" minimum, 14" maximum; 2 thicknesses
- ½" to ¾" to 1¼" (yet uniform in each bundle or pallet).
* Lower half of face is clear. Flat and cross grains allowed. Tight
knots and other limited defects allowed in top half of shake.
*1991 ICBO Uniform Building Code requires No.2 grade taper-sawn shakes
having two thicknesses at the butt; 5/8" or ¾" with a minus
tolerance of 1/16"
Roof Exposure - 7½" for 24 inch shake; 5½" for 18 inch
shake.
Wall Exposure - Single course - 10" for 24 inch shake; 7½" for
18 inch shake.
Double course: 11½" for 24 inch shake; 8½" for 18 inch
shake.
Recommended Use - For walls or roofs 4:12 pitch or steeper and where
a good quality appearance is desired.
 Number 3 Grade
Description - Lengths 18 inch, 24 inch; width 3" minimum, 14" maximum; thickness ½" nominal
(½" to 1¼", yet uniform in each bundle or pallet). Face
sound and serviceable. Flat and cross grains allowed. Limited
knots and defects allowed on the entire face.
Roof Exposure - Not recommended for roofs of human occupied buildings.
7½" for 24 inch shake; 5½" for 18 inch shake. 12:12 pitch
minimum.
Wall Exposure - Single course: 10" for 24" shake; 7½" for 18
inch shake.
Double course: 11½" for 24 inch shake; 8½" for 18 inch
shake.
Recommended Use - For walls where a rustic, knotted appearance is acceptable.
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- Class A, B & C fire rating may be obtained by specifying
Certi-Guard permanent fire retardant Certi-Sawn shakes.
- Certi-Last treated shakes are available for added longevity
and come with a 30 year warranty against rot and fungal
decay.
- Products manufactured by members of the Cedar Shake & Shingle
Bureau are graded in accordance with UBC Standard No.
32-8 and/or CSA 0118.1
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specifications and descriptions.
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