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Grading Rules - Western Red Cedar Clears

Simple grading comparison chart

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401.   No 2 Clear & Btr (B & btr or Prime)

         Rough KD, AD or GRN, as ordered

         VG or RG, as ordered

Shall be sound timber, well manufactured.  Three (3) irregularities permitted on face side, four (4) on reverse side, including corresponding half of edges or equivalent, for each 12 lineal feet (3.7m), based on 8” (203mm) widths.  Shall average at least six (6) rings of annual growth to the inch (25mm) on either one end or the other of the piece.  If VG is ordered, widths 10” (254mm) and wider must show vertical grain for at least 2/3 of the face.

Will admit the following or their equivalent:

         Variation in sawing: slight in occasional piece(s)

         Knots: sound and tight.

                                    Face Side              Reverse side        

Under 3” (76mm) thick   ½” (13mm)             ¾” (19mm)

3” (76mm) and thicker    ¾” (19mm)             1” to 2” (25 to 51mm) according to              thickness of piece

Characteristic Soft Knots: on reverse side and corresponding half of edges, approximately ½ the allowable size for sound tight knots.

Split: approximately width of piece. 

Slope of Grain: maximum 1 in 8. 

15% of pieces in shipment may contain four (4) of the above irregularities on the face side and characteristic soft knots (as described above) may extend into the opposite face.

 

401 - a.       No. 4 Clear

                  Rough KD, AD or GRN, as ordered

                  VG or RG, as ordered

Recommended and widely used where general utility purposes are of more importance than appearance.  Timber shall be well manufactured.  Grade descriptions are based on a piece 8” (203mm) wide and 12 lineal feet (3.7m) in length.  Grade is determined from the better face and corresponding half of edges.  The number of characteristics in larger or smaller pieces may vary in proportion to the size of the piece.

Unless otherwise specified, characteristics on the reverse face can be slightly in excess of those allowed on the face.

Will permit the following characteristics or their equivalent:

         Knots: four (4) or equivalent smaller:

                                                               Face Side

         Under 3” (76mm) thick                     1” (25mm)

         3” (76mm) and up to less than           1 ½” (38mm)

                  5” (127mm) thick

         5” (76mm) and thicker                      2” (51mm)

 

         Pockets: five (5) medium or equivalent.

         Split: short.

         Checks: seasoning.

         Warp: light.

         White Speck: firm; 10% of face, 25% of reverse face.

         Wane: 1/8 width, 1/6 length, maximum ¼ thickness

Wormholes: pin, 15 per sq. ft. (305 x 305mm) on face, 30 per sq. ft. on reverse face.

Occasional piece(s) in shipment may have a 4” (102mm) cut out, 4’ (1.2m) or more from either end in pieces 12’ (3.7m) and longer.

 

WRC Siding

408.   Siding (Weather Boarding)

KD, AD or GRN, as ordered

VG or RG, as ordered

Grades based on 1 x 6 (25 x 152mm), 12’ (3.7m) in length.  Rule to apply proportionally on narrower or wider stock.

409.   No 2 Clear & Btr (B & btr or Prime) Siding

Shall be sound timber, well manufactured, suitable for paint.

Will admit the following or their equivalent:

         Torn Grain: medium.

         Scant Tongue: not more than 1/6 (2mm) scant.

With the above will admit one of the following or their equivalent:

Knots: three (3), sound and tight, approximately ½” (51mm) or one (1) sound and tight, approximately ¾” (19mm).

Checks: two (2) seasoning, each approximately 6” (152mm) long, none through

Sap Stain: medium.

15% of shipment will admit the following or their equivalent:

         Skips in Dressing: 15% of face, in occasional piece(s).

         Scant Tongue: not more than 1/8” (3mm) scant.

         And one of the following or equivalent:

         Knots: three (3), sound and tight, approximately 1” (25mm).

         Checks: seasoning, none through.

A piece 12’ (3.7m) and longer may have an irregularity located 4’ (1.2m) or more from the end of the piece, which can be cut out without wasting more than 2 ½” (64mm) in length, provided balance of the piece is practically equal to No. 2 Clear and Better.

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