Grades
Arena. Rough sawn No.2 and
Better structural members are used to frame this
structure.
Community Center. No2 and
Better structural timbers create the dramatic lines
of this building. The rough members are finished
in a semi-transparent stain.
more
images
|
Clear Grades
Clear cedar in the grades shown on the
following pages has a limited number of natural
characteristics and is specified when appearance
of the highest quality is desired. Clear grades
of timbers are normally supplied green (unseasoned).
When required, seasoning is achieved by air-drying.
Knotty Grades
Knotty cedar presents a more rustic appearance
and is typically supplied green (unseasoned) in
the appearance and structural grades shown on
the following pages. When required, seasoning
is achieved by air-drying except for grades of
Light Framing and Structural Joists and Planks
which are available kiln-dried.
Grade Classifications
Depending upon size, Western Red Cedar is
classified as Light Framing, Structural Joists and
Planks, Beams and Stringers, or Posts and Timbers.
In general, the grades referred to herein are rough
sawn.
Light Framing is lumber 2 to 4 inches thick
and 2 to 4 inches wide either rough sawn or surfaced
four sides (S4S).
Structural Joists and Planks are rectangular
members 2 to 4 inches thick, 5 inches and wider,
either rough sawn or surfaced four sides (S4S).
Beams and Stringers are rectangular members,
either rough sawn or surfaced, 5 inches and thicker
with width 2 inches greater than thickness.
Posts and Timbers are square members, either
rough sawn or surfaced, 5 inches by 5 inches and
larger with width not more than 2 inches greater
than thickness.
Surface Textures
Saw Textured The saw textured surface, obtained
during the milling process which uses either circular
or band saws, is present on all four sides.
Rougher Headed The lumber receives its texture
from a milling process which uses roughened planer
knives. The rough texture is clearly visible on
all four sides.
Surfaced Four Sides (S4S) The smooth surface
on all four sides presents a uniformly sized product
with a high quality appearance. Sizes from 2x4
up to 6x6 in. are generally available. Larger
sizes are produced on special orders.
|

Fence and Gateway. A four post
gated entry complements the intricate detail of the
fence. A natural tone stain has been used to provide
protection and colour.
more
images
GRADES OF TIMBER AND LANDSCAPE LUMBER:
SPECIFICATIONS
| Grade |
Description |
Grading Rule Paragraph
|
| No. 2
and Better Clear |
|
This grade should be specified
when the finest quality rough lumber is desired.
The lumber is sound and well manufactured. Its natural
characteristics do not detract from the woodÕs fine
appearance. |
Export R List 401
|
| D and Better Clear
|
|
This grade consists of
D Clear, C Clear, and B Clear
The C and Better Clear grade offers good appearance
in high quality, well manufactured lumber. Suitable
for high quality landscape structures and as exposed
posts and beams in heavy timber construction. WRCLA
members produce this grade without cut-outs. In
most cases, this grade is sold with a specified
allowance of D grade.
D Clear grade permits larger and more numerous natural
characteristics which are widely accepted in the
construction of outdoor structures. Some pieces
of D Clear may require trimming to yield clear lengths
for the intended use. Available surfaced or rough
textured. |
2" and thinner, 3"and wider
NLGA 202 b,c,d
WCLIB 149 b,c,d
2-1/4" and thicker, 3"and wider
NLGA 203 b,c,d
WCLIB 150 b,c,d
|
| Appearance Knotty |
|
A non structural product
manufactured to meet the appearance requirements
of quality projects. This material has highly restricted
wane allowances to give well defined corners. Contains
no holes or other characteristics. Represents good
value for appearance end uses. Available rough sawn
or rougher headed in nominal 2" and thicker sizes.
Note: Upon request, Appearance Knotty timbers are
available with structural grading. Be certain to
specify Appearance Knotty structural lumber when
strength characteristics are required. |
Proprietary |
| No. 2 and Better Structural |
|
Material of this grade
is evaluated for structural strength characteristics.
The classification includes pieces meeting the grades
of Select Structural, No. 1 Structural, and No.
2 Structural. Lumber of this grade is intended for
engineered applications where strength is more important
than appearance. Available surfaced or rough textured.
Graded as Light Framing
* Graded as Structural Joists and Planks
|
2"x2"/4" to 4"x4"
NLGA 122 b,c
WCLIB 122 b,c
WWPA 40.11
2"x6" to 4"x12" and wider*
NLGA 124 a,b,c
WCLIB 123 a,b,c
WWPA 62.10
5" and thicker, width more than 2" greater than
thickness
NLGA 130 a,b,c
WCLIB 130 a,b,cc
WWPA 70.10
width less than 2" greater than thickness
NLGA 131 a,b,c
WCLIB 131 a,b,cc
WWPA 80.10
|
| Standard Beams, Posts
and Timbers |
|
Timbers of this grade are
intended for general construction purposes where
serviceability is more important than appearance.
No structural values are assigned. Available surfaced
or rough textured. |
5" and thicker
NLGA 131 c
WCLIB 131 c
WWPA 81.11
1 NLGA - National Lumber Grades Authority
WCLIB - West Coast Lumber Inspection Bureau
WWPA - Western Wood Products Association
R List - Export R List (applies to rough sawn/rougher
headed lumber) |
|