Lap sidings are supplied in a variety of patterns in clear or knotty grades and with a
smooth or saw textured face
Channel siding is a popular type of lap siding and is used whenever a rustic appearance is desired. A versatile siding, it can be installed vertically, horizontally or
diagonally. In channel siding the profile of each board partially overlaps that of the
board next to it creating a channel that gives shadow line effects, provides excellent
weather protection and allows for dimensional movement.
Channel siding is normally supplied in unseasoned knotty grades. The face side is
saw textured. Commonly available sizes are 1 x 6 in., 1 x 8 in. and 1 x 10 in. Clear
grades are manufactured to order.
Grade : CLEAR HEART
Description
The highest grade. Includes only pieces with
heartwood on the exposed face. Many pieces
completely clear, others have minor
imperfections that do not detract from their
fine appearance.
Grading Rule Paragraph1
NLGA 200a
WCLIB 102-b
Grade : A CLEAR
Description
Permits somewhat more imperfections than
Clear Heart but the grade is still restricted to
pieces with excellent appearance. Typically
sold with a percentage of B grade
(NLGA 200c/WCLIB 102-d).
Grading Rule Paragraph1
NLGA 200b
WCLIB 102-c
Grade : SELECT KNOTTY
Description
Available kiln-dried or unseasoned. Knots are
sound and tight. Typically sold with a
percentage of Quality Knotty grade
(NLGA 204b/WCLIB 111-f).
Grading Rule Paragraph1
NLGA 204a
WCLIB 111-e
Grade : PROPRIETARY GRADES*
Description
Designed to meet appearance requirements
for cedar sidings and trim. Ask your WRCLA
distributor for details.
Grading Rule Paragraph1
NLGA N/A
WCLIB N/A
*Manufacturers may market their own proprietary grades.
1NLGA – National Lumber Grades Authority
WCLIB – West Coast Lumber Inspection Bureau
Western Red Cedar Lumber Association
General Information: wrcla@wrcla.org
Toll Free: 1-866-778-9096
Administration
1501-700 West Pender Street
Pender Place 1, Business Building
Vancouver B.C.
Canada V6C 1G8
Telephone: 604-684-0266
Fax: 604-687-4930
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