I-L
Inconspicuous (Blending Pin Knot):
Sound knots 1/4 inch or less that do not contain dark centers. Inconspicuous or blending pin knots are hardly detectable at a distance of approximately 6' and do not seriously detract from the overall appearance of the panel. These are permitted in all grades.
Joint:
The line between the edges or ends of two adjacent sheets of veneer or strips of lumber in the same plane.
Kiln Dried:
Lumber that has been seasoned in a kiln to a predetermined moisture content.
Knot:
A branch or limb embedded in a tree and cut through in the process of manufacturing. Knots are classified according to size, quality and occurrence. In lumber, the size classifications are: Pin knot, one not over 1/2-inch in diameter; Small, a knot larger than 1/2-inch but not over 3/4-inch; Medium, larger than 3/4-inch but not over 1-1/2-inches; Large, over 1-1/2-inches in diameter.
Knot Occurrence:
Knots are classified by the way they occur in a piece of lumber. Types of occurrences include: 1. Branch knots, two or more divergent knots sawed lengthwise and tapering toward the pith at a common point. 2. Corner knot, one located at the intersection of adjacent faces. 3. Cluster, two or more knots grouped together, the fibers of the wood being deflected around the entire unit. 4. Single knot, one occurring by itself, the fibers of the wood being deflected around it. 5. Spike, a knot sawed in a lengthwise direction.
Knot Quality:
In addition to size, knots are classified according to quality. Classifications include: 1. Decayed, a knot softer than the surrounding wood, and containing advanced decay. 2. Encased, a knot whose rings of annual growth are not intergrown with those of the surrounding wood. 3. Intergrown, a knot partially or completely intergrown on one or two faces with the growth rings of the surrounding wood. 4. Loose, a knot not held tightly in place by growth or position, one that cannot be relied on to remain in place. 5. Fixed, a knot that will hold its place in a dry piece under ordinary conditions; one than can be moved under pressure but not easily pushed out of the surrounding wood. 6. Pith, a sound knot containing a pith hole not over 1/4-inch in diameter. 7. Sound, a knot that is solid across the face, as hard as the surrounding wood, and shows no indications of decay. 8. Star-checked, a knot having radial checks. 9. Tight, a knot fixed by growth or position so as to retain its place. 10. Firm, a knot that is solid across its face but contains incipient decay. 11. Watertight, a knot whose annual rings of growth are completely intergrown with those of the surrounding wood on one surface of the piece, and which is sound on the surface.
Lamination:
The process of gluing or bonding the component sections of the plywood into a single permanent unit stronger than the original wood itself.
Longwood:
The trunk of the tree is the part that begins just above the stump and continues to just below the crotch. Most veneers are cut from long wood by quarter, rotary, or flat cutting.
Laminated Veneer Lumber (LVL):
Structural wood members constructed of veneers laminated to make a "flitch" from which pieces of specific sizes can be cut.
Lath:
A thin, narrow wooden strip, used as a backing for wall plaster or other materials, or as a fencing material.
Lattice:
A small, plain, S4S moulding originally used in trellis work.
Long Lengths:
A loose term generally referring to boards or dimension lumber longer than the lengths that are common for the species or region. In the Inland West, long lengths are widely understood to be pieces 18 feet or longer. In other regions, the phrase refers usually to dimension 22 feet in length or longer.