gaps: Spaces between individual boards. Normal to open and close with changes in humidity.

gel: the act of taking on body or becoming gelatinous or jelly-like

glazing: An added step for achieving color uniformity and depth, and for highlighting the wood’s grain pattern.

gloss: Also referred to as sheen. A surface shininess or luster.

gloss meter: An instrument for measuring reflected light from a finished surface to define sheen. Can be used at different angles of deflection, the most common of which are 20, 60 and 85 degrees.

glue down installation: A method of installing in which planks (usually engineered) are glued using appropriate mastic directly to the subfloor. This application is often used for concrete subfloors.

glue joint: a joint that uses adhesive instead of nails or screws

glue line: the adhesive joint formed between two boards in a joint.

golden rectangle: A rectangle which has as its ratio of length to width equal to 1.618 (the golden ratio) l/w=(l+w/l ) (1 + sqrt5)/2 .

grade: The result of a process called grading by which boards are classified according to characteristics and quality standards as set by NHLA. Grading takes into account size, type and size of acceptable flaws and other characteristics.

grain: The direction, size, arrangement and appearance of the fibers in wood or veneer.

grain raising: The objectionable roughness of wood caused by the application and absorption of stains or other materials. The roughness is due to the short, broken fibers of wood which more or less stand up due to the swelling or raising action of the liquid coating.

grayness: An objectionable, hazy, dull appearance in a rubbed film, usually caused by the finish being oil rubbed too soon after application. Avoided by allowing more drying time.

grey pores: The objectionable appearance when the pores of the wood have a bleached, yellowish or grayish look after the finishing coats are applied. Caused by improper formulation of the filler or top coats or by the use of filler too weak in color strength for the

grit: Refers to the size of the particles used in sandpaper and sharpening stones- represents the number of particles in one square inch.

groove: A long narrow channel cut in wood.

gross lumber tally: Lumber measured in board feet when freshly cut and before kiln drying (which will shrink the wood and reduce the board footage).

gullet: A relief area cut in front of the tooth of a saw blade in order to provide a temporary place to store the material cut away by the tooth on each pass of the blade. Design of gullet must consider type of material being cut, type of cut (rip, crosscut), spe

gum patch: A particular form of gum pocket that commonly forms in American black cherry. Looks a little like black- line spalting or bark inclusion.

gymnosperm: A botanical classification for plants whose seeds are not enclosed in ovaries. Within this group are all softwood tree species. They have cones, and tend to have needles instead of broad leaves, and tend to be evergreen.