Sawn timber grade recovery from a planted coast redwood stand growing in New Zealand

New Zealand Journal of Forestry Science

Table 2 (A) Appearance grades (25 mm) and (B) construction grades (50 mm +)

Grade	Sapwood	Pockets	Wane	Checks/Birdseye	Shake	Stain	Rot	Holes	Sound knots (mm or area)				Sound occlusion
A
									Face	50-150 mm	200-250 mm	300 mm
Clear All Heart (CH)	No	Nil	Nil	Nil		Medium	Nil	Nil		Nil	Nil	Nil	Nil
Clear Common (CC)	Yes	2, 3x25mm	10% W 25% T	Yes		Medium	Nil	Nil		2, 19mm	2, 19mm	2, 19mm	Back 2 small
Heart B (HB)	No	2 small	10% W 25% T	Yes		Medium	Nil	3 mm, some pin		33% area	50mm	63mm	Back only
B Common (BC)	Yes	2 small	10% W 25% T	Yes		Medium	Nil	3 mm, some pin		33% area	50mm	63mm	Back only
Merchantable Heart (MH)	10% of 1 face	Yes	50% T 25% W	Yes		Medium	2 ½ knot	As knot size	<50	60% area	40% area	125mm	Yes
Merchantable Common (MC)	10% of 1 face	Yes	50% T 25% W	Yes		Medium	2 ½ knot	As knot size	<50	60% area	40% area	125mm	Yes
B
								75-150; 200-300 widths		50-150 mm	200-250 mm	300 mm
Construction Heart (ConH)	10% of 1 face	4 medium	13mm 10%w 25%T	Yes	2mm 25%L	Medium	Nil	19mm 25mm	50mm 75mm	½ area	1/3 area	1/3 area	Yes
Construction Common (ConC)	Yes												Yes
Merchantable Heart (MH)	10% of 1 face	Yes	50% T 25% W	Yes		Medium	2 ½ knot	As knot size	<50mm	60% area	40% area	125mm	Yes
Merchantable Common (MC)	10% of 1 face	Yes	50% T 25% W	Yes		Medium	2 ½ knot	As knot size	<50mm	60%	40%	125mm	Yes

Face = Visible “best” face.
W = Width; T = Thickness.
Source: Redwood Inspection Service (http://www.redwoodinspection.com/publications.htm).