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USA & Canada
Western Red Cedar siding is available in clear and knotty grades. Clear siding gives premium quality appearance and is ideal for prestigious, upmarket applications. Knotty siding has warmth and casual charm and is ideal for homes, cottages, club-houses and applications where a rustic appearance is desired.
Clear siding is graded for smooth face use with the exception of Rustic which is graded for saw textured use only.
Grades
Clear V.G. Heart
This is the highest Bevel siding grade. All Clear V.G. Heart grade is sawn vertical grain (edge grain) and is kiln dried. Pieces have a smooth face of decay-resistant heartwood and are free from growth characteristics that affect appearance or performance. Pieces have excellent dimensional stability and hold finishes exceptionally well.Available solid wood or finger-joined.
Available in Bevel Siding Pattern only.
Clear Heart
The highest grade for non-Bevel patterned siding. 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.
Available in Board & Batten, Tongue & Groove, Lap/Channel Siding Patterns and Trim Boards
A Clear
This is a fine appearance grade that allows only slightly more growth characteristics than Clear Heart. Pieces are of mixed grain.These mixed grain (vertical and flat) pieces are graded from the surfaced face.Typically sold with a percentage of B grade.
Common specifications are A and Better and A and Better with a percentage of B Clear allowed.
Available in Bevel, Board & Batten, Tongue & Groove, Lap/Channel Siding Patterns and Trim Boards
C and Better Clear
High quality lumber for use where appearance is important. In addition to interior and exterior trim, lumber of this grade is used for cabinetry, doors, windows and similar applications.
* Common specifications are C and Better and C and Better with a percentage of D Clear allowed.
Available in Board & Batten Siding Pattern only.
Proprietary
Graded to the manufacturer’s specifications to meet the intended end use. Boards often represent good value in the no-hole product range. Consult manufacturers for grade descriptions and nomenclature.
Available in Board & Batten, Tongue & Groove, Lap/Channel Siding Patterns and Trim Boards
Standard and Better
Suitable for exterior construction. Occasional pieces may require trimming to yield suitable quality for the intended end use. Typically supplies as S1S2E products. S4S products may require special ordering.
Available in Board & Batten, Tongue & Groove, Lap/Channel Siding Patterns and Trim Boards
Rustic
Rustic grade siding is recommended for use as sidewall covering where the distinctive charm of a rustic saw textured appearance is desired. This grade allows limited characteristics that do not detract from serviceability.Available solid wood or finger-joined.
Available in Bevel Siding Pattern only.
Select Knotty*
Knots and other natural features define the visual character of knotty sidings. In Select Knotty grade, knots are sound and tight. Available rough or dressed, kiln-dried or unseasoned and smooth or saw textured. Some companies may supply this grade with knots glued on the reverse face.
Common specifications are Select Knotty with a percentage of Quality Knotty allowed.
Available in Bevel, Board & Batten, Tongue & Groove, Lap/Channel Siding Patterns and Trim Boards
Architect Knotty®
This product is intended to be fully usable with the resawn face exposed after trimming to fit the stud wall spacing. Contains no open characteristics or through defects. The product allows the use of adhesives on the reverse face to secure knots. Architect Knotty® is particularly well suited for factory priming or finishing. Supplied kiln-dried.Architect Knotty® is a registered trademark of the WRCLA
Available in Bevel Siding Pattern only.
Grading Rules
Western Red Cedar Siding Grading Rule Paragraph
Clear V.G. Heart
| NLGA | WCLIB | WWPA | |
| Bevel | 201a | 106-aa | 22.11 |
Clear Heart
| NLGA | WCLIB | WWPA | |
| Board & Batten | 200a | 102-b | 20.11 |
| Tongue & Groove | |||
| Lap/Channel | |||
| Trim Boards |
A Clear
| NLGA | WCLIB | WWPA | |
| Bevel | 201b/201c | 106-a | 20.12 |
| Board & Batten | 200b | 102-c | 20.12 |
| Lap/Channel | |||
| Trim Boards | |||
| Tongue & Groove | 200b/200c | 102-c | 20.12 |
C and Better Clear
| NLGA | WCLIB | WWPA | |
| Board & Batten | 202b/202c/202d | 149-b/149-c/149-d | 10.11/10.12/10.13 |
| Trim Boards | 202b/202c | 149-b/149-c | 10.11/10.12 |
Proprietary
| NLGA | WCLIB | WWPA | |
| Board & Batten | Proprietary | Proprietary | Proprietary |
| Tongue & Groove | |||
| Lap/Channel | |||
| Trim Boards |
Standard and Better
| NLGA | WCLIB | WWPA | |
| Board & Batten | 114a/114b/114c | 118a/118b/118c | NA |
| Tongue & Groove | |||
| Lap/Channel | |||
| Trim Boards | 114a/114b/114c | 118a/118b/118c | 30,50(118a,b,c) |
Rustic
| NLGA | WCLIB | WWPA | |
| Bevel | 201d | NA | NA |
Select Knotty*
| NLGA | WCLIB | WWPA | |
| Bevel | 205a | 111-e | NA |
| Board & Batten | 204a/204b | 111-e/111-f | NA |
| Tongue & Groove | 204a | 111-e | NA |
| Lap/Channel | |||
| Trim Boards |
Architect Knotty®
| NLGA | WCLIB | WWPA | |
| Bevel | Proprietary | Proprietary | Proprietary |
NLGA – National Lumber Grades Authority
WCLIB – West Coast Lumber Inspection Bureau
WWPA – Western Wood Products Association
