A |
Smooth, sanded, paintable surface. Up to 18 neatly
made repairs permitted, all must be parallel to the grain. May
be used for natural finish (clear sealer type) in less demanding
applications. Synthetic repairs permitted. |
B |
Solid, sanded surface. Shims, circular repair
plugs and tight knots to 25 mm (1 in.) across the grain permitted.
Some minor splits to 0.75 mm (1/32 in.) permitted. Synthetic
repairs permitted. |
C
|
Improved C veneer with splits limited to 3 mm
(1/8 in.) width and knotholes and borer holes limited to 6mm
(1/4 in.) x 12.5 mm (1/2 in.). Admits some broken grain due
to sanding defects or loose fibres, but fractures not allowed.
Synthetic repairs permitted. Touch-sanded for sizing. |
C |
Tight knots to 37.5 mm (1-1/2 in.). Knotholes
to 25 mm (1 in.) across grain and some to 37.5 mm (1-1/2 in.).
Synthetic or wood repairs. Discolouration and sanding defects
that do not impair strength permitted. Limited splits allowed,
stitching permitted. C-grade veneer minimum permitted for Exterior
panels. |
D |
Knots and knotholes to 62.5 mm (2-1/2 in.) width
across grain and 12.5 mm (1/2 in.) larger within specific limits.
Limited splits permitted. Stitching permitted. Use of D-grade
veneer limited to Exposure 1 panels. |
