The Language of Doors
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By Jessy Zhang
Posted: October 30, 2014
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Active: In paired or double doors, the hinged door leaf which is primarily operable.

Affidavit Label:
For fire-rated doors, a label that states that the door meets a type or types of test criteria.

Air Infiltration:
Air passing through a door system when the door is under pressure, usually from wind.

Astragal: The post-type fitting on the latch-side edge of a set of double doors, which covers the margin between doors when they are closed, and which houses or contains the weatherstrip.

Backset:
For locating a machined hole, recess, or mortise, the distance from an edge or surfaces to the center or edge of the recess, hole or mortise.

Barbed:
Describes the feature of a part which inserts into a slot, and which has surface features that enable it to stay firmly inserted into the slot.

Boot: A term used for the rubber part at the bottom or top end of an astragal, which seals the end and the door frame or sill.

Boss, Screw Boss:
A feature which enables the fastening of a screw. Screw bosses are features of molded plastic lite frames and extruded aluminum door sills.

Box-Framed:
A door and sidelite unit that is framed as separate units, with heads and sills separate. Box-framed doors are joined to box-frames sidelites.

Brickmould: A molding used to trim the outside edge of a door frame. Brickmould is most often applied to prehung units.

Came, caming:
Formed metal stripping, made of brass, brushed nickel or black nickel plated steel, used between cut-glass pieces to assemble the pieces into a decorative glass panel. Caming is soldered at joints to bond the glass assembly together.

Carpet Shim:
A spacer block used under a door sill to raise the sill so the door panel clears the carpet when opened.

Casing:
A horizontal or vertical molding, which accents or trims edges of doors and windows to the surrounding walls.

Caulking:
Sealant which is extruded or troweled into a recess or joint, to seal against air and water leakage through the joint.

Clad:
Provided with a facing which works as a protection against weather, and provides a finished appearance. Cladding may be painted metal, plastic, or a heavy coating.

Clear Jambs:
Natural wood door frames without joints or knots.

Continuous Sill:
A sill for a door and sidelite unit that has full width top and bottom frame parts, and internal posts separating sidelites from the door panel.

Core:
The center section or part of a door or door part.

Corner Seal Pad: a small part, usually made of resilient material, used to seal water from getting between the door edge and the jambs, adjacent to the bottom gasket.

Cove Molding:
A small molded wood lineal piece, usually formed with a scooped face, used to trim and fasten a panel into a frame.

Cylinder Lock, Cylindrical Lock:
Lock hardware which mounts into a door which has been prepared with a bored hole or holes through the face, and into the edge.

Deadbolt: A latch used to secure a door closed, the latch being driven from the door into a receiver in the jamb or frame.

Doorlite: An assembly of frame and glass panel, which when fitted to a door in a formed or cut-out hole, creates a door with a glass opening.

Double-Glazed: Outfitted with two panes of glass with a sealed airspace between.

Drip Strip: In exterior doors, a fitting used across, the outside face of the door adjacent to the bottom edge, to divert cascading rain away from the door bottom edge and away from the door/sill joint.

Drywall Opening: A rectangular opening in a wall prepared to the size necessary to receive a pre-hung assembly.

Dummy Cylinder: A lock without a latch used for the passive door panel of a double door unit, so that the hardware appears equal to that used on the active panel.

Edge Bore: The hole bored through the edge of a door to allow the latch to pass through, into the strike.

End Seal Pad: A closed-cell foam piece, about 1/16-inch thick, in the shape of a sill profile, fastened between the sill and the jamb to seal the joint.

Etched Glass: Glass used for doorlites on which a decorative pattern is engraved by means of chemical action or mechanical sand-blasting.

Extension Unit: A framed fixed door panel with a full-sized lite of glass, adjacent to a two-panel patio door, to make the door unit into a three-panel door.

Faceplate: The plated or solid metal trim piece, usually about 1x2-1/4 inches, housed flush into the edge of a door, through which projects the latch of a passage lock or deadbolt.

Finger Joint: A way of joining short sections of board stock together, end to end to make longer stock. Door and frame parts are often made using finger-jointed pine stock.

Fire Door: A door which has been tested to contain the spread of fire from one room to another. Fire doors are listed and labeled in terms of time, i.e., 20-Minute, 90-Minute, etc.

Flush-Glazed: A type of glazed door which has its glass perimeter moldings flush with the face of the surrounding door.

Foam: Rigid or flexible plastic, light in weight and cellular in structure, used in door construction. Rigid foam is used as the insulating and binding core for doors.

Foot Bolt: A steel pin housed in a door bottom edge or astragal, with a latch mechanism, which can be driven down to project into a receiver socket in the floor or threshold, to secure the door when closed.

Frame: In door assemblies, the perimeter members at the top and sides, to which the door is hinged and latched. See jamb.

Galvanized: An adjective used to describe steel which has been zinc-coated. Galvanized steel is resistant to corrosion.

Gasket: A strip of flexible material which prevents air and water from penetrating or passing through joints between parts.

GBG: Abbreviation for grilles sealed between clear glass.

Glazing: The elastic material used to seal glass to a frame.

Grille: An assembly of wood or plastic pieces used to give a doorlite a patterned multi-pane look.

Grooved Glass: Glass which has been decorated with abrasively-routed recesses. Grooving can give a single piece of glass a multi-paned look.

Handing: A term which describes or determines the direction of swing of a door when opening.

Head Bolt: A steel pin housed in a door top edge or astragal. See foot bolt.

Head, Head Jamb: The horizontal top frame of a door assembly.

Hinge: Metal plates with a cylindrical metal pin that fastens to a door edge and door frame to allow the door to swing.

Hinge Stile: The full-length vertical edge of a door, at the side or edge of the door which fastens to its frame with hinges.

IG Unit: Abbreviation for insulated glass unit.

Inactive: A term for a door panel fixed in its frame. Inactive door panels are not hinged and are not operable.

Insulated Glass, Insulating Glass: A glass assembly of multiple full-lite pieces, separated by a perimeter spacer and sealed.

Inswing: A term used to describe an exterior entry door which swings into a home or building.

Jamb: A vertical perimeter frame part of a door system.

Kerf: A thin slot cut into a part with a molder or saw blades. Weatherstrip in inserted into kerfs cut into door jambs.

Latch: A moveable, usually spring-loaded pin or bolt, which is part of a lock mechanism, and engages a socket or clip on a door jamb, retaining the door closed.

Leaf: A term which can apply to a door or hinge and which defines a part of the assembly which can swing on a pivot.

Lite: An assembly of glass and a surrounding frame, which is assembled to a door at the factory.

Lock Block: A rectangular block of wood placed inside a door at the lock side edge, which reinforces the assembly when the lock hardware is installed.

Lock Bore: For cylindrical locksets, the through hole, usually 2-1/8-inches in diameter, bored near the door panel's lock edge, into which the lock mechanism is placed and installed.

Lock Stile: In wood stile and rail doors, the full length wood piece, 4 to 6-inches wide, at the lock edge of the door.

Low-E Glass: Glass which has been factory coated with a thin layer of material, nearly clear, which acts to absorb and reflect heat and light energy.

LVL: Abbreviation for laminated veneer lumber - a manufactured wood product of veneer layers bonded together and made to specified strengths for structural purposes.

Mortise: A recess cut into the edge of a door for the purpose of housing hardware such as hinges and lock parts.

Mull: A short term for mullion. Used to describe the joining of two door together, or the joining of a door to a sidelite unit.

Mullion: A post or divider which runs from sill to frame top in a multi-panel door or door and sidelite assembly. In stile and rail doors, the vertical wood parts which separate panels.

Multiple Extension Unit: In patio door assemblies, a fixed door panel in a separate frame, edge-joined to a patio door unit to add another glass panel to the installation.

Muntins: Thin vertical and horizontal divider bars, which give a doorlite a multi-paned look. They may be part of the lite frames, on the outside of the glass, or between the glass.

NRP Hinge: A hinge with a non-removable pivot pin used when exterior doors swing out, as a security feature. The fixed pins make it impossible to remove a door by driving out pivot pins.

Outswing: An exterior door assembly in which the door panel swings outside the building.

Panic-proof Lock: A lock and latch device which permits a door to be opened outward by pressure being applied to a bar mounted across the inside face of the door.

Passive: In a double door assembly, the door which remains closed and fixed by bolts at tp and bottom.

Prehung: A door assembled in a frame (jamb) with sill, weatherstripping and hinges and ready to be installed into a rough opening.

R-Value: A number which describes the ability of a material or assembly to resist the flow or transmittance of heat. The higher the R-value the better the insulation.

Rail: In insulated door panels, the part, made of wood or a composite material, which runs inside the assembly, across the top and bottom edges. In stile and rail doors, horizontal pieces at top and bottom edges, and at intermediate points, which connect and frame between the stiles.

Reveal: The offset or margin between edges of parts.

Riser: A term which describes the part of an adjustable sill which can be moved up or down by turning adjusting screws.

Rough Opening: A structurally-framed opening in a wall which receives a door unit or window.

Safety Glass: Glass, which when broken, shatters into small pieces without sharp edges.

Screen Track: A feature of a door sill or frame head which provides a housing and runner for rollers, to allow a screen panel to slide from side to side in the door.

Sealant: Elastic material pumped or troweled into a joint to prevent water penetration.

Self-Locating Hinge: A hinge with indexing or locating tabs to aid in exact placement against a door edge.

Shim: A thin piece of material used between parts of an assembly, to change and fix the distance between parts, when parts are fastened.

Sidelite: A fixed narrow panel with glass, installed next to a door panel, for decorative purposes.

Sill: The horizon base of a door frame which functions with the door bottom to seal out air and water.

Slide Bolt: Part of an astragal at the top or bottom, which bolts into frame heads and sills for passive door panels closed.

Spacer, Glass Spacer: A lineal part with rectangular cross section, running along the perimeter edges, between the glass pieces of an insulating glass unit.

Stile: In insulated door panels, the full-length parts, usually wood, which make up the long edges. In stile and rail doors, the vertical edge parts.

Strike: A metal part with a hole for a door latch, and a curved face so a spring-loaded latch contacts it when closing. Strikes are fit into mortises in door jambs and screw-fastened.

Subfloor: The floor surface lying under the finished floor. Prehung door assemblies are installed atop the subfloor.

Substrate: The base or core material in an assembly of parts. In sills, the full length wood or composite part of the sill, visible only from the bottom side, or ends.

Tempered Glass: Glass sheet which has been strengthened by heat processing. Tempered glass when broken, shatters into small pieces without sharp edges. See safety glass.

Thermal Break: A feature of a door which separates metal or glass exposed to outside temperatures from coming into contact and transmitting heat to or from inside-exposed parts.

Threshold: Another term for sill. The horizontal part of a door assembly, fixed under the door panel and bearing on the floor.

Transom: A framed glass assembly mounted above a door unit.

Transport Clip: A steel piece used to temporarily fasten a prehung door assembly closed for handling and shipping, which maintains the door panel's proper position in the frame.

U-Value: A number which describes the ability of a material or assembly to transmit heat from outside to inside surfaces. Assemblies with lower U-values transmit less heat than those with higher values. A U-value is the inverse of an R-value.

Veneer:
A thin film or facing, adhesively bonded to a core or substrate, which makes up the exposed and decorative face of an assembly.

Weatherstripping: A narrow strip of material installed around a door which provides a seal against air and water infiltration.

Wired Glass: Glass made for use in fire doors, which has embedded wires which bind the glass, and permit the glass to remain monolithic when exposed to fire.

Wrought Iron: A soft, malleable and fibrous metal obtained by smelting iron ore and then worked (wrought) with a hammer to remove the slag (impurities) and formed/welded into the desired shape while still hot.

Yellow Zinc Dichromate: A brass-look plating to steel parts, which is highly corrosion-resistant.
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