And Better - This is typically abbreviated as "&Btr", and what it indicates is that the lumber contains pieces that exist in a higher grade than the lowest grade that is acceptable.

Appearance Grade - This is a grade used for framing lumber that is intended for use in exposed housing and in light construction where a high quality appearance is required.

Blow - This describes a separation within a portion of veneers in a panel made from plywood that were caused by a steam pocket. Steam pockets usually occur during the pressing process.

Board Foot - This is the basic measurement unit that is used for measuring lumber. A single board foot equals a 1 inch thick board that is 12 inches in length and 12 inches in width. A 10-foot long board that is 12 inches wide with 1 inch in thickness, then, would equal 10 board feet. Nominal sizes are generally assumed in the calculation of board feet.

Bright - This term is used to refer to recently milled material that is fresh, unstained and also free from any discoloration.

Check - This is a separation of wood that runs lengthwise, typically occurring across the annual growth rings which generally occurs as a result of seasoning.

Clear - This term refers to wood product that is either completely free or at least mostly free from any defects, characteristics or blemishes.

Common - This term describes lumber that is considered to be suitable for utility and general construction purposes.

Cull - This is a term to describe lumber of such a low quality that it has no real value commercially.

Dry - This is wood that has been seasoned and that has a moisture content that is 19 percent or lower.

Economy - This is the lowest grade that is recognized in lumber. It permits serious lumber defects including large holes, knots, splits, unsound wood, wane and other similar defects.

Fingerjoint - This is a method that is used to join two lumber pieces end to end by sawing each of the piece's on their ends and projecting interlocking fingers to form a strong glue joint when the pieces are pushed together.

FOHC - This is an acronym that refers to being free of heart center, meaning that it is lumber that is specifically cut to exclude the log's heart center.

Glue Lam - This is a shortened form of glue laminated, which involves bonding together individual slices of veneer or lumber using an adhesive to create a single piece of lumber.

Hardwood - This is a general term that is used to refer to deciduous trees and their lumber. It does not actually have anything to do with the true hardness of the lumber.

Kiln Dried - This is a term that describes lumber that has been kiln seasoned until it reaches a pre-determined content of moisture.

Photo Credits: Incase Designs

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