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Info You Need to Make an Educated Choice about Windows


Here on our Resources page, you can find information and tips that can help you while you shop for replacement windows.  If you would like to learn more about energy efficient windows and what they can do for your home, please give us a call today at (225) 274-8062 or fill out the easy Quick Contact Form to the right.


Window Terms Explained: A Basic Glossary

APRON: A piece of horizontal sash or window trim applied against the wall immediately below the stool; serves to conceal the joint between the window frame sill and the plaster on interior finish surface.

BASEMENT SASH UNIT: (cellar sash unit) - A sash unit, usually of the in swinging or hopper sash type, used for basement or cellar sash openings.

BAY WINDOW: Composed of three or more individual windows, generally with the side or flanker units at 45° or 30° angles to the wall of the structure.

BOTTOM RAIL: The bottom horizontal member of a window sash.

BOW WINDOW: Composed of three or more individual windows in a gently curved contour. Bow windows also project from the wall of the structure.

CAP / CAPPING: Cosmetic covering, usually found on the exterior of the window to achieve aesthetic sight lines.

CASING (Trim): Exposed molding or framing around a window, on either the inside or outside, to cover the space between the window frame or jamb and the wall.

CIRCLE TOP WINDOW: A window having a curved top and a flat bottom. The shape of the window is a half-circle with the height being usually one-half of the width.

COTTAGE-STYLE WINDOW: Hung Window (Single or Double) that has a larger bottom sash (lite) than the top sash (lite).

DESICCANT: A drying agent usually in granular form used by some manufacturers between the panes of insulating glass to prevent “fogging” between the panes.

DOUBLE HUNG WINDOW: Two sash which move vertically, by-passing each other in a single frame. Sash may be counter-balanced by weights or springs.

DOUBLE WINDOW: Two windows separated by a mullion, forming a unit. Also called a twin window unit.

EYEBROW WINDOW: Today, used to identify certain arch-topped or radius-topped windows that have a curved top like the shape of a human eyebrow.

FIXED LIGHT (Fixed Sash): Window, which is non-operative (does not open).

FRAME: Outside member of a window which encloses the sash.

GLIDING WINDOW: Same as a sliding window, the moving sash travels on rollers.

HOPPER VENT: Inward-opening sash hinged at the bottom (an upside-down awning window). Many basement windows are this type.

HUNG WINDOW: Window with one or more hanging (counter balanced) sashes.

JAMB: A vertical member at the side of the window frame; also refers to the horizontal member at the top of the window frame (Head Jamb and Window Jamb).

KEEPER: The part of a window lock, mounted on an opposing surface of the window, that the lock arm locks under or into to pull the sash into a locked position and fully releases it when opened.

LATCH (Catch/Lock): A device which holds a window shut, such as the latch at the meeting of a double-hung window, often referred to as Lock.

LITE (light): A window; a pane of glass within a window. The number of lites in upper and lower sash designates double-hung windows, as in six-over-six. Often spelled “Lite” to differentiate from sunlight or other light sources that shine through a window.

LOW-E GLASS: Glass that has been given a special micro-thin coating that blocks the passage of radiant heat through the glass for better energy efficiency without appreciably affecting the view through the glass (like tinting can do).

OBSCURE GLASS: A glass (frosted, etched, fluted, ground, etc.) for privacy, light diffusion, or decorative purposes.

PICTURE FRAME CASING: The use of trim casing on all four sides of the interior of a window, resembling a picture frame when installed.

POCKET SILL: A deep sill (frame) design that completely surrounds the bottom edge of the sash in the closed position.

PRIME SASH: The balanced or moving sash of a window unit.

QUARTER ROUND WINDOW: Stationary or operating window with glass shaped as a quarter circle.

RADIATION: Energy released in the form of waves or particles, due to a change in temperature within a gas or vacuum.

RAIL: Horizontal members of a window sash or door panel.

ROOF WINDOW: Sloped application of fenestration product, which allows for in-reach operation and rotation of sash to facilitate the cleaning of exterior surfaces.

R-VALUE (Thermal Resistance): A measure of the resistance a unit of heat has in flowing through a given material or construction; a higher value indicates a better heat-insulating property.

SASH: A single assembly of stiles and rails in which the lites of a window are set. The framework holding the glass in a window unit.

SIDE LITE (light): A fixed, often narrow, glass window next to a window.

SILL: The horizontal member at the bottom of the window frame; a masonry sill or sub-sill can be below the sill of the window unit.

SINGLE-HUNG WINDOW: A window that is similar to a double-hung window except that the top lite (light) is fixed (stationary).

STOP: A trim member attached to the window frame to stop the sash of a projecting window when closed to prevent it from swinging through the opening.

TEMPERED GLASS: Special heat-treated, high-strength safety glass which shatters into pebble-sized particles but not into long slivers, when broken.

ULTRA-VIOLET: Type of radiation with wavelengths shorter than those of visible light and longer than those of X-rays. Causes sunburn, fading and breakdown of fabric, wood, furniture and other exposed surfaces.

VERTICAL SLIDING WINDOW: One or more sashes that move in a vertical direction.

WARM EDGE SPACER: Use of a non-conductive edge spacer in insulating glass units instead of the conventional metal (conductive) edge spacer.

WEEPHOLE: Small holes drilled along the bottom edge of storm sash, combination storm-screens, or windows with “pocket” sills to permit moisture condensation or wind-driven rain to drain away from the sill to the outdoors.


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