THE WOOD GLOSSARY




Wood terms beginning with:

A B C D E F G H IJK L M N O PQ R S T UV W XYZ


Patterned lumber - Lumber that is shaped to a pattern or to a molded form in addition to being dressed, matched, or shiplapped, or any combination of these workings.

Peavey - A tool used for rolling logs. Similar to a cant hook, but it has a point on the end.

Peck - Pockets or areas of disintegrated wood caused by advanced stages of localized decay in the living tree. It is usually associated with cypress and incense cedar. There is no further development of peck once the tree is seasoned.

Phloem - The inner part of a tree's bark that delivers water and other nutrients.

Photosynthesis - A process that plants use to synthesize nutrients from water end minerals, using light.

Piling - Round timber of any required size or length, usually used with smaller end in the ground.

Pin hole - From any cause approximately 1/16" in diameter.

Pin knot - A knot that is not more than 1/8 inch in diameter.

Pitch - An accumulation of resin.

Pitch pocket - An opening extending parallel (commonly) to the annual rings of growth usually containing, or which has contained, pitch, either solid or liquid. Most commonly found in wood from conifers (softwood), though can be found in some kinds of hardwood, such as cherry and Mesquite.

Pitch seam - Shake or check which is filled with pitch.

Pitch streak - A well-defined accumulation of pitch in the wood cells in a more or less regular streak. Most common in conifers.

Pith - The small, soft core occurring near the structural center of a tree trunk, branch, twig, or log, around which the annual rings form..

Pith fleck - A narrow streak, resembling pith on the surface of a piece; usually brownish, up to several inches in length; results from burrowing of larvae in the growing tissues of the tree.

Plain-sawn lumber - A method of sawing lumber where the log is cut tangential to the growth rings. Another term for flat-grained lumber; especially common in softwood lumber.

Plank - (1) A piece of lumber, from 2 but not including 5 inches thick, generally used with wide face horizontal: (differs from joist only that latter is used on edge). (2) A broad board, usually more than 1 inch thick, laid with its wide dimension horizontal and used as a bearing surface.

Plywood - A glued wood panel made up of relatively thin layers of veneer with the grain of adjacent layers at right angles, or of veneer in combination with a core of lumber or of reconstituted wood. The usual constructions have an odd number of layers.

Pocket - A pocket is a well-defined opening between the rings of annual growth, usually containing pitch or bark.

Pocket rot - Advanced decay which appears in the form of a hole, pocket or area of soft rot usually surrounded by apparently sound wood.

Pole - Round timber of any required size or length, usually used with larger end in ground.

Porous wood - Wood with larger than normal pores and vessels

Posts and timbers - Large pieces (nominal dimensions, 5" by 5" and larger, width not more than 2" greater than thickness) of square or approximately square cross section graded primarily for use as posts or columns.

Preservative - Any substance that, for a reasonable length of time, will prevent the action of wood-destroying fungi, borers of various kinds, and similar destructive life when the wood has been properly coated or impregnated with it.

Progressive kiln - A kiln in which the total charge of lumber is not dried as a single unit but as several units, such as kiln truckloads, that move progressively through the kiln. The kiln is designed so that the temperature is lower and the relative humidity higher at the end where the lumber enters than at the discharge end.

Pulp Trees - Small trees and saplings that will be ground to produce paper. Lumber farmers often over-plant their acreage and remove smaller trees for pulp as the crop matures.

Quarter - A unit of measure for the nominal thickness of hardwood, expressed in quarters of an inch. Generally expressed as a proper or improper fraction,such as 4/4 or 6/4. For example 4/4 (stated "four quarters") lumber has a nominal thickness of one inch, though the final measured thickness is usually somewhat less after the lumber has been dried and planed. Similarly, 8/4 lumber is nominally 2 inches thick, and so on.

Quarter-sawn - A method of cutting lumber where the annual rings are relatively perpendicular to the face of the board. Quarter-sawn lumber tends to be more dimensionally stable than other forms of lumber, such as plane-sawn. Quarter-sawn lumber as also referred to as edge-grained lumber.

Quilted Figure - Small-scale “pillow”-like figure most commonly found in Oregon Big-leaf Maple.



The Wood Glossary






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