The Ultimate

Dictionary of Wood Door Terms

You Should Know

50 Terms That are Imperative

to Anyone Learning About Doors.

1.Door Core A core placed inside the door to provide either strength or fire rating. Core types are corrugated  honeycomb paper, particleboard, wood stave, mineral fiber, polyurethane, 
 or polystyrene.


2.Veneer- A thin sheet or layer of wood, usually rotary cut, sliced or sawn from a log, bolt or flitch; thickness may vary  from 1/100 to 1/4 of an inch. Also referred to as skin, ply, veneer ply.


3.Height- The measurement from the base to top of the door.


4.Width- The measurement from side to side of the door.


5.Trim- Millwork, primarily mouldings and/or trim to finish-off (trim around) window and door openings, fireplaces, walls and  other members.


6.Fire Door- Fire doors are designed to meet independent testing facilities' (Underwriter's Laboratory [UL] and Warnock  Hersey [WH] standards for fire ratings of 20, 30, 45, 60, or 90 minutes. The specific rating is achieved through the application of  special door cores and framing materials.


7.Weathering-The mechanical or chemical disintegration and discoloration of the surface of wood caused by exposure to light.  The action of dust and sand carried by winds and alternate shrinking and swelling of the surface fibers with continual variation in  moisture content due to changes in  the weather. Also an inclined surface on a member such as a cornice or sill which directs  away rain water.

8.Gap- Open splits in the inner ply or plies or improperly joined veneer when joined veneers are used for inner plies.


9.Flat Jamb- This jamb is a plain piece of lumber, not rabbeted or ploughed. Instead of a door rabbet, this jamb requires a  door stop applied to prevent the door from swinging through.

10.Architectural Door- Doors designed for commercial and industrial applications meeting specific standards  of construction (eg. Fire rating, sound transmission). Generally used to signify higher standards than "residential" doors.


11.Flush Door- A flat-faced door that may have a variety of door facings and may be hollow-core or solid-core.


12.Stile - The upright or vertical framework pieces of a door.


13.Hollow Core Door- A type of door that has corrugated cardboard between the stiles and rails and is made up of 
 an interior frame of stiles and rails, covered by a skin of veneer or hardboard, plastic, or metal.

14.Bifold Door- A door capable of being folded into two parts,as with doors that are hinged together.

15.Door Panel-A sheet of thin lumber, plywood or composition material inserted into the frame formed by the stiles, rails and  mullions of a door.


16.Door Bevel- An angled cut on the lock side of a door, usually 3 degrees, that enables it to swing free of the door frame  when opening and closing.

17.Door Jamb- The part of a door frame which surrounds and contacts the edges of the stiles and top rail of a door. Jambs  may be classified as (1) "head" or "side" jambs and (2) "plain" or "rabbeted".

18.Exterior Threshold - A threshold non-symmetrically beveled, (the more gradual and longer bevel facing the exterior) which, 
 when secured to the exterior door frame sill and/or finished floor,  prevents water from driving under the door.


19.Face- Outer or exposed ply in cross banded construction. Also the surface from which lumber grade is determined.

20.Top Rail- Upper most horizontal member of a sash, door, blind or other similar panel assembly.


21.Trim- Millwork, primarily mouldings and/or trim to finish-off (trim around) window and door openings, fireplaces, walls and 
other members


22.Rabbet- A rectangular cut consisting of two surfaces cut on the edge of a member parallel with the grain. A rabbet has two  surfaces and a "plough" has three. Also referred to as a "rebate" or rabbit.


23.Rail-The cross or horizontal pieces of a door's framework of: "top rail," "mullion rail," "lock rail," and "bottom rail" are  different types of rails based on their location in the structure of the door.


24.Veneer Cut- A thin sheet or layer of wood, usually rotary cut, sliced or sawn from a log, bolt or flitch; thickness may vary  from 1/100 to 1/4 of an inch. Also referred to as skin, ply, veneer ply.


25.End Joint- A joint formed by the ends of wood members. The most common is the "fingerjoint".

26.Code- Code refers to a collection of laws, regulations, ordinances, or statutory requirements adopted by governmental legislative authorities.

27.Bottom Rail- The lower most horizontal member of a sash, door, blind or other panel assembly.

28.Blind Mortise-and-Tenon Joint - A joint where the tenon does not extend through the mortise (a rectangular cavity in a piece of wood, stone, or other material) and does not remain visible once the joint is completed.

29.Bevel- To cut to an angle other than a right angle, such as the edge of a board or door.

30.Adhesive-A substance capable of holding material together by surface attachment commonly referred to as glue.

31.Aesthetics-The appreciation of beauty or good taste.

32.Astragal- A special molding attached to one of a pair of doors that prevents them from swinging or sliding completely through the opening. Also to prevent air infiltration.

33.Base Moulding- A moulding applied where the floor and wall meet, forming a visual foundation. A base protects walls from kicks, bumps, furniture, and cleaning tools. A base may be referred to as one, two, or three member. The base shoe and base cap are used to conceal uneven floor and wall junctions. Also when a relatively small moulding is applied to the top of the base with a two-member base it forms a three member base.

34.Cold Press-A bonding operation in which an assembly is subjected to pressure without the application of heat.

35.Cross Rail- Center most horizontal member.

36. Door Face-The wide flat surface of a door.

37.Double Action Door- A door, usually interior, with special hinges or pivots which allow the door to function in both  directions.

38.Extension Jamb- Flat parts which are nailed to the inside edges of the window or door frame, so that it will fit a wider  wall.

39.Finger Jointing- A method of joining wood pieces milled in the shape of fingers, which mesh together and are held firmly in position by a water-resistant adhesive. This method has enabled the millwork industry to create longer lengths of wood and to utilize shorter pieces of raw material. Finger jointing is not a new woodworking technique but has been vastly refined. So precise can the joint now be made on such items as mouldings, door and window jambs, and doors that the lines of joining are barely perceptible. When there is no great variation in grain or color, the end-welded pieces appear as one.

40.Fiberglass-The most familiar type of insulation. It is spun from molten glass, and is pure white. Additives and binders often color the fiberglass, with pink and yellow being the most common. Fiberglass comes in rolls, batts and as loose insulation which is blown into place.

41.Interior Door Frames- A door frame installed in the interior wall of a structure.

42.Laying Panels- Grain of panel running horizontally.

43.Louvre (or Louver) Door-A door, bifold or shutter constructed with a series of downward-sloping, horizontal slats that allow  ventilation, inhibit sunlight, and provide some privacy.

44.Mineral Core- Fire-rated core of a door available in 45, 60, or 90 minute versions.

45.Plank and Beam- A type of construction technique where planks and beams (large timbers) are utilized in a framework to  provide the support structure for a house or building.

46.Rotary Cut- A veneer cut from a full log-like unwinding a roll of paper-which produces a wide and variegated grain pattern.

47. Sheathing- A surface, usually of wood or fiberboard, applied to the exterior faces of the studs or wall frame.

48.Solid-Core Door- A door with a solid interior made from composite wood, agri-fiber, wood staves, particleboard, or fire-rated  mineral fiber.

49.Telegraphing- When the internal components of a door show through as lines on the face of the veneer.

50.Weatherstrip- Variously shaped metal, vinyl plastic or moulded fiber strips which fit tightly against sash or door frame parts to prevent air infiltration through cracks. Adjustable pressure weatherstrip-sash or window weather-stripping on which sash tension is maintained by means of spring action.

109 Kero Road, Carlstadt, NJ 07072

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