5-LAYER – SPRUCE

Class A (A under EN 13017-1):
Joint-tight surface, plain to slightly coarsely ringed wood, healthy firmly intergrown knots, individual black point knots permitted, individual slight compression wood occurring, slight pith portions possible, slight colour deviations permissible, slight cracks on panel edges permissible, natural knot plugs, resin pockets and resin pocket repairs to a large extent permissible, individual sapwood permissible (for pine, larch and Douglas fir), overall homogeneous wood pattern.

Class B (B under EN 13017-1):
Joint-tight surface, strong and pronounced wood pattern, largish knots and resin pockets permissible, increased repairs with natural knot plugs and resin pocket patches possible, compression wood, slight discolorations, pith and sapwood (for pine, larch, Douglas fir and Swiss stone pine) permissible.

Class C+ (C under EN 13017-1):
No particular quality standards, discolorations, pith, compression wood, knots, resin pockets and cracks to a large extent possible, generally without special requirements in respect of the surface. With the class C+, the C side would be repaired.