QUALITY CLASS

3 Layer – DOUGLAS FIR

Quality class A (A according to EN 13017-1):

Joint-tight surface, plain to slightly coarse wood, healthy firmly intergrown knots, isolated black point knots permitted, occasionally slight compression wood  occurring, small proportion of pith possible, slight colour deviations permissible, slight cracks at the edges of the panels permissible, natural knot plugs, resin pockets permitted and resin pocket repairs to a greater extent permissable, sapwood permissible (for pine, larch and Douglas fir), overall homogeneous wood appearance.

Quality class B (B avg. EN 13017-1):

Joint-tight surface, strong and pronounced wood pattern, larger knots and resin pockets permitted, increased repairs with natural knot plugs and resin pocket patches possible, compression wood, slight discoloration, pith and sapwood (for pine, larch, Douglas fir and stone pine) permissible.

Quality class B (B avg. EN 13017-1):

Joint-tight surface, strong and pronounced wood pattern, larger knots and resin pockets permitted, increased repairs with natural knot plugs and resin patches possible, compression wood, slight discoloration, sapwood (for pine, larch, Douglas fir and stone pine) permissible.

Quality class C+ (C+ avg. EN 13017-1):

No special quality requirements, discoloration, compression wood, branches, resin pockets and cracks possible on a larger scale, all in all without any special requirements for the surface.