I agree that whether the board lays flat or not has great importance to quality
lumber and difficulties at the planer. Again, the single most recurring factor at my kilns causing non-flat boards would be sawmill mismanufacture. Boards that are
thicker than target cause the stacking stick to not lay flat across all boards in
that layer. This causes a gap between the layers that has no pressure created
on the thinner boards, thus allowing them to cup if board characteristics for
cupping are there. I also permits board warpage for the same reason. If boards
are thinner than target, they too, will be permitted to cup and warp because
the pressure is not on that board as the sticks are being supported by the
target boards, again permitting space for the thin board to cup and warp.
Thick and thin stacking sticks create this same problem. Thick and thin sticks
and non-target boards also cause stick warpage, which is expensive.
Hello, Joe, long time no see!