A: slight natural colour variation possible, calm and reduced appearance of rift/quarter cut, contrasting colour variation are a valued feature (greyish/blueish/redish). Sound knots and dead knots possible, bark pockets and small cracks as well as cracked knots partially allowed, knotholes professionally filled. Joint free gluing.
Backing C+: fir, knotholes and shakes professionally filled, twin layers not laid next to each other, no special quality specifications, finger-jointed allowed.
Panels are glued SWP/2 NS (non structural): solid wood panels for non-structural use in wet areas, with regard to appropriate constructional protection also suitable for exterior use (sheltered areas).
Legend: SML = strip core, BML = board middle layer