nail down installation: A method of installing in which wood planks are attached directly to the plywood sub-floor with nails driven either through the top of the surface layer (top or face nailing) or through the tongue of each board ( side nailing).

National Hardwood Lumber Association: NHLA- an organization founded to establish a uniform system of grading rules for the measurement and inspection of hardwood lumber.

natural: Lumber that is not color selected.

nested bundle: Flooring placed end to end continuously in runs with the run length equaling the nominal bundle length plus or minus 6”.

net lumber tally: Lumber measured in board feet after kiln drying- compare to gross lumber tally.

newel: The vertical post at the top and bottom of a staircase where the banister is supported.

NGR stains: Non-Grain raising stains are dye solutions that do not contain pigments. Spray application gives an overall transparent color to the wood, offering a high degree of clarity.

nitrocellulose: the basic ingredient of most common natural lacquers

nominal size: As applied to timber or lumber, the size by which it is known and sold in the market ( often differs from actual size) such as 2 x 4.

nondrying: Lacking the ability to absorb oxygen from the air or to change from a liquid to a solid state when spread out in a thin film. Mineral oils, castor oil, peanut oil, and coconut oil are examples of nondrying oils.

nonvolatile: Not subject to high rates of evaporation- describes portion of finishing agent that remains after any volatile portions have evaporated.

northern: Lumber logged from states that are adjacent to the Canadian border, from North Dakota, Minnesota, Wisconsin, Michigan, Northern Pennsylvania, Upper New York, New Hampshire and Maine.

northern hardwood forest type: A forest type common to the northeastern US, includes Sugar Maple, Red Maple, Yellow Birch, Hemlock and American Beech.

nosing: The rounded front edge of a stair tread that extends over the riser. Also-A hardwood moulding used to cover the outside corner of a step, milled to meet the hardwood floor in a horizontal plane, to meet the riser in a vertical plane. (Usually used on lan

nubs: Ane of the size grading of natural resins, being about the size of the end of the finger. Smaller than “Bold”, but larger than “seed” or “dust” grading.

number one common (#1 common): An NHLA grade for hardwood lumber primarily used in furniture and cabinet shops. Requires a clear face cutting yield of 2/3rds.