oak , gum, cypress forest type: A forest type common to the bottom lands of the southeastern US.

oak- hickory forest type: A forest type common to the northeastern us, includes Red and White Oak, Hickory, Yellow Poplar, and Red Maple.

oak-pine forest type: A forest type common in the southeastern US- includes Loblolly Pine, Virginia Pine, Red Aak and White Ash.

odor: That property of a substance that is perceptible by the sense of smell; scent or fragrance of a material.

off color: Not matching the color of a standard with which a material is being compared.

off grade: Lumber that does not conform to the grade it was represented as being.

ogee: A shape usually referring specifically to moulding with a double curve which in cross section looks like the letter “S” with the convex part above and the concave part below.

oil based: Finishing agents made with a drying oil (linseed, tung or soya) as the vehicle and the binder, and mineral spirits/paint thinner or naphtha as the thinner.

old growth: Wood from an old growth forest; A term biologists use to describe trees which have been growing approximately 200 years or longer. The lumber and flooring industry defines trees by lumber grades or characteristics, not age. Not to be confused with the ter

old growth forest: An old forest that has never been altered or harvested by humans generally 200+ years old.

opacity: The extent to which a material does not pass light the ability of a finishing agent to hide the surface to which it is applied.

opaque: Describes material that completely blocks the passage of light and cannot be seen through.

open coat: Sandpaper is either open coat or closed coat. Closed coat has grit over 100% of the backing paper. Open coat has grit uniformly spread over the backing paper to cover 40to 60% For hardwoods, open coat clogs less and has a more uniform scratch pattern.

open defects: Any irregularity, such as checks, splits, open joints, cracks, knot holes, or loose knots that interrupt the smooth continuity of the veneer.

open grain hardwood: Such as Elm, Oak, Ash and chestnut are “ring porous” species. These species have distinct figure and grain patterns.

open staircase: A staircase in which there are only treads and no risers.

orange peel: Pebbled film surface similar to the skin of an orange appearance. It is caused by too rapid drying before leveling takes place.

OSB- Oriented Strand Board: Commonly used for an underlayment or subfloor material. Strands tend to be oriented with their length aligned with the panel length. OSB is therefore stronger and stiffer when installed with the long axis across supports.

outfeed: The direction the work piece is fed out of a blade or cutter; the area into which a work piece is fed out of a blade or cutter.

oven dried weight: The weight of a piece of lumber that has been dried in an oven, generally at 220 degrees F until it is devoid of all water. This weight is used in the calculation of the moisture content of the wood.

oven dry wood: Wood dried in an oven until it has no more moisture.

over wood/under wood: A flooring condition in which there is perceived misalignment of the flooring surface, with some pieces raised above the adjacent pieces, leaving a slightly uneven surface. Also called lippage.

overrun: A situation where the mill expects to achieve a certain number if board or lineal feet from a run, but obtain more than expected. Contrast with underrun.

overspray: The dry pebble-like surface caused when sprayed finish begins to dry in the air before it hits the surface. Sprayed finish which misses the area being finished and falls upon the surrounding surface.

oxidation: A layer of oxidized material on the surface.

oxidization: A layer of metal oxide formed by the chemical reaction of oxygen with a surface.

oxidize: To react chemically with oxygen- rust and fire are examples.