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Moulding Glossary

When you’re shopping for moulding, it helps to understand all the language you’ll find to describe the different types. Use this helpful glossary to make sure you get the right moulding for your project.

Entry room with wall and door moulding

A-C

Chair Rail

Apron
A piece of horizontal sash, window trim or casing applied to the wall immediately below the window stool; the apron serves to conceal the joint made by the sash or window frame sill and the interior wall surface

Astragal
An interior moulding attached to a pair of doors or sash in order to prevent swing-through of both doors that ensures a tight fit where the doors meet; a flat astragal is one applied to the face of the meeting stile of the door; a T astragal is rabbeted (notched) to the approximate thickness of the swinging door

Back Band
A narrow, rabbeted (notched) moulding applied to the outside corner and edge of interior window and door casing to create a heavy trim look; this increases both the ornamentation as well as the width of the trim


Band Moulding
A flat, decorative or protective strip that’s flush or raised above the surface; this moulding is similar to a panel moulding as well as an apron profile, and it’s often used to trim mantels or cabinets


Base Cap
A moulding applied to the top of a piece of base moulding, increasing the decorative look; it’s sometimes used with baseboard; base cap may also be used as a panel moulding or multipurpose profile


Base Shoe
Also called shoe or floor mould, this narrow moulding provides a transition between finished floors and walls or cabinets; it protects the base from damage and conceals uneven lines or cracks where the base meets the floor; can be used in place of quarter round


Bead Moulding
Plain or sprung moulding that’s applied where two surfaces come together at an angle; the profile usually consists of a bead and a cove; it’s often used in place of crown where the walls and the ceiling meet


Brick Mould
A thick moulding used on an exterior door and window as a casing that joins the exterior facing and provides a surface for brick or other siding to butt against; it may be used to form a rabbet for screens, storm sash or a combination door


Cased Opening
An interior opening without a door but finished with jambs and casing


Casing
Moulded or surfaced four-sides (S4S) trim used around door and window openings; exterior casing is used to trim the exterior of windows and doors, and interior casing is used to trim the interior perimeters of windows and doors


Caulk
Waterproofing sealant for cracks and joints around window and doorframes


Chair Rail
Interior moulding applied on the wall about 1/3 of the way up from the floor, paralleling any base or crown moulding, and encircling the room; originally used to prevent chairs from damaging the walls, it’s now used more for decorative purposes; it can be made from more than one piece of moulding to build up the effect


Cope
To cut or shape the end of a piece of moulding so that it will cover and fit the contour of the piece it’s placed against


Corner Blocks
Square blocks used in place of mitering the side and head casings


Cove
A moulding with a concave profile used primarily where two planes in a construction come together at right angles to each other; it may be used as a crown around the ceiling or on the inside of a vertical corner as a corner guard


Crown Moulding

Moulding used to cover the intersection where the walls and the ceiling meet; usually applied wherever a large angle is to be covered; always installed sprung (angled); also called cornice moulding

D-F

Door Frame

Dentil Moulding
Moulding featuring a series of small square blocks uniformly spaced and projecting like teeth

 
Dentil Crown
Crown moulding made up of dentil moulding and other moulding types, such as crown and base or base cap, to make up a crown mould system

 
Doorjamb
The part of a doorframe that surrounds and contacts the edges of the stiles and top rail of a door

 
Finger Jointed
A piece of wood that has a series of fingers machined on the ends of the two pieces to be joined that are meshed together and are held firmly in position by a water-resistant adhesive; these joints are made in a mill used to join short lengths together to make long lengths


Frame
All parts that enclose the window sash or door; vertical members are called side jamb, the top horizontal piece is called the head jamb and the bottom horizontal piece is called the sill

G-M

Lattice

Jamb
A vertical perimeter frame of a window or door


Lattice
A thin strip of wood, or PVC, surfaced on four sides


Lineal Foot
1 foot of a board or moulding regardless of the width or thickness, also called the running foot; usually this term designates nonspecified lengths


Miter
An angled cut across the end of a lineal part that’s usually done to join with a similarly cut part at a corner; the cutting of the end of a piece at an angle other than a right angle


Moulding
A narrow strip of wood shaped to a curved profile that’s used to accent and emphasize the ornamentation of a structure and to conceal surface or angle joints; it may either be exterior or interior


Mullion
Also called the mull, this is the vertical member of a sash, window or doorframe between openings in a multiple opening frame

N-P

Picture Moulding

Panel Mould
A decorative moulding used to trim out raised-panel wall construction

 
Picture Moulding
A narrow moulding along the perimeter of the walls near the ceiling line to support hooks for picture hanging; it can be used to make decorative, formal squares on the wall; it’s also called picture rail moulding or picture frame moulding

 
Plinth Block
A decorative block of wood, thicker and wider than a door casing; used as part of the door trim at the base to enhance the appearance; also called a base block, foot block or pilaster block


Plumb
Exactly perpendicular or vertical; at right angles to the floor of a structure


Primed Moulding
Moulding with a layer of paint or primer applied to it


PVC
Polyvinyl chloride; a plastic material used to make moulded or extruded parts

Q-T

Rosette detail on the fireplace

Quarter Round
Moulding that’s 1/4 of a full circle rod and may be used as a base shoe or inside-corner moulding


Rabbet
A rectangular recess cut or formed along the long edge of a wood part; a cutout along the end or edge of lumber; a groove cut in or near the edge of a piece of lumber to fit the edge of another piece


Rosette
A decorative wood plaque secured to a wall and abutted by the end of a stair rail; it may also be used as ornamental decoration at the bottom of window or doorjambs

 

Solid Moulding
Nonfinger jointed moulding


Square Foot
The length of an item in feet multiplied by its width in feet

Stool Moulding
A moulded interior trim member serving as a sash or window frame sill cap; these are generally rabbeted


Stop Moulding
In window trim, a moulding that holds the bottom sash of a double-hung window in place and can also be used as an apron under window stools; in door trim, a stop is nailed to the faces of the doorframe to prevent the door from swinging through the frame

U-Z

Wainscot

Wainscot
A lower-interior wall surface that contrasts with the wall surface above it and is generally 3 to 4 feet in height, often with a chair rail added to its top perimeter


Wall Base
A moulding applied around the perimeter of a room along a finished floor; also called baseboard, mop