Tongue & Groove
- Grades
Grades of Western Red Cedar Pattern Siding
Grade
Description
Grading Rule Paragraph
CLEAR GRADES
Clear Heart
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.
NLGA 200a
WCLIB 102-b
A Clear*
Permits somewhat more imperfections
than Clear Heart but the grade is
still restricted to pieces with excellent
appearance.
*Common specifications are A and
Better and A and Better with a percentage
of B grade allowed.
NLGA 200b
WCLIB 102-c
B Clear
Permits slightly larger and more
numerous characteristics than A grade
and occasional pieces may require
trimming to yield high grade pieces
in shorter lengths. Most often supplied
as a percentage with A grade.
NLGA 200c
WCLIB 102-d
KNOTTY GRADES
Select Knotty
Available kiln dried or unseasoned.
Knots are sound and tight.
NLGA 204a
WCLIB 111-e
Quality Knotty
In this 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 siding.
NLGA 204b
WCLIB 111-f
Proprietary Grades
Designed to meet appearance requirements
for cedar sidings and trim. Ask your
WRCLA distributor for details.
*Manufacturers may market their
own proprietary grades.
NLGA n/a
WCLIB n/a
Standard and Better
Suitable for exterior construction.
Occasional pieces may require trimming
to yield suitable quality for the
intended end use.
1NLGA - National Lumber Grades
Authority
WCLIB - West Coast Lumber Inspection
Bureau
