EXTERIOR DFP : Veneer Grade Descriptions

Douglas Fir Plywood
Veneer Grade Descriptions CSA O121

 
VENEER GRADE DESCRIPTION

Grade "A" Veneer

(4.1.1)

 

 

 

Grade "A" veneer shall present a firm, smoothly cut, solid surface, free from sand-throughs, knots except for pin knots, which shall not exceed six per face, pitch pockets, and open defects. Grade "A" veneer permits:

(a) Use of filler to fill splits up to 6 mm and chipped or open areas;

(b) Minor surface roughness, including slight grain imperfections and/or sanding and patching defects, that does not affect the serviceability of the panel;

(c) Tight splits, streaks, and discolourations;

(d) Wood inlay patches up to 60 mm in width; single patches, any number; and double patches, not wider than 100 mm, where one patch overlaps another, shall be limited to three per face; and

(e) Synthetic patches up to 75 mm in width when measured across the grain of the panel, provided that open defects so repaired do not exceed the maximum size permitted in this Standard.


Grade "B" Veneer

(4.1.2)

In addition to the characteristics permitted in Grade "A" veneer, Grade "B" veneer permits:

(a) Sound tight knots up to 40 mm measured across the grain;

(b) Use of filler to fill splits up to 6 mm in width and chipped areas or openings up to
20 mm in maximum dimension;

(c) Grain imperfections;

(d) Spits and other openings up to 5 mm in width; limited to a maximum of six per ply; and

(e) Wood inlay patches, whether singly or in combination, up to a maximum of 100 mm in width measured across the grain.

Grade "C" Veneer

(4.1.3)

In addition to the characteristics permitted in Grade "B" veneer, Grade "C" veneer permits:

(a) Sound knots in outer plies up to 50 mm measured across the grain, limited to a maximum of nine per ply;

(b) Sound knots in inner plies up to 50 mm measured across the grain;

(c) Knot-holes in outer plies up to 32 mm measured across the grain and knot-holes up to 40 mm measured across the grain, limited to nine per ply;

(d) Knot-holes in inner plies up to 40 mm measured across the grain;

(e) Pitch pockets up to 25 mm in least dimension;

(f) Splits tapering to a point:

(i) Within 25 mm from panel edge; maximum width 6 mm;
(ii)Not closer than 25 mm from panel edge; maximum width
10 mm; any length;
(iii)Not closer than 25 mm from panel edge; maximum width
15 mm; not exceeding 600 mm in length;

(g) Worm or borer holes up to 15 mm in width and
38 mm in length; and

(h) Other characteristics in number and size that will not affect the serviceability of the panel.