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Moulding Glossary

A room with different types of moulding

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.


Apron

Apron

Shop Moulding

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

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

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

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

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

Cased Opening

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



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

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

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

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

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



Dentil Moulding

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



Jamb

Jamb

A vertical perimeter frame of a window or door



Lattice

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

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



Panel Mould

Panel Mould

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



Picture Moulding

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

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



Quarter Round

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

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



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

Wall Base

A moulding applied around the perimeter of a room along a finished floor; also called baseboard, mop board or skirting; it can be used in combination with shoe moulding to form a two-member base or base cap forming a three-member base


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