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After an initial cut through the diameter of a log, parallel cuts produce flitches—strips of lumber with consistent thickness. Two cuts on each flitch trim the bark from the sides, and reduces it to a standard board width with squared edges. Two more cuts at each end set the length.
To reduce buckling that may occur along the middle of flat-cut boards, the initial cut may be offset from the diameter, and resulting sections cut further before cutting the flitches.
Flat-sawn wood often exhibits "flat-" or "slash grain", where the angle between the visible growth rings and the width of the board is 45° or less. This makes the wood vulnerable to deformation as it dries, or if later exposed to moisture. Flat-sawn wood is less stable than quarter sawn or rift sawn wood, but can be produced more quickly and at lower cost.
The face of the board may show curved grain, sometimes with intricate patterns.
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- What is the difference between Quarter Sawn, Rift Sawn and Plain Sawn Lumber? - Hardware Distributor's Association
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