Replacement Windows, Vinyl Padio Doors & Vinyl Siding    

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

L

Laminated Glass:  Glass that is made by bonding two or more pieces of glass together with a tough protective layer or polyvinyl butyl (PVB) between the panes by using heat and pressure.   Used for safety glazing and sound reduction. Often used in Hurricane areas.

Lift Handle:  A handle for raising and lowering the sash that is not continuous across the sash.

Lift Rail:  A handle for raising and lowering the sash that is continuous across the sash.

Light: A unit or pane of glass in a window.  Also spelled lite.

Light Shaft:  An insulated shaft built to direct the light from a roof window or skylight through the attic to the room below.

Lintel:  A horizontal header beam above a window or door opening that supports the structure above and spans a window or door opening; may be structural or solely decorative

Lite:  A unit or pane of glass in a window.  Also spelled light.

Lock Rail:  The horizontal section of the sash where the cam lock is attached.

Lock Stile:  The vertical section of the sash where the cam lock is attached.

Long-Wave Infrared Radiation:   Invisible radiation, IR, beyond red light on the electromagnetic spectrum (above 3.5 micro meters), emitted by warm surfaces such as a body at room temperature radiating to a cold window surface. In thermograph photos, can show where heat is coming in and out of house structures and windows.

Low-E:  See low emissivity.

Low-Emittance/Emissivity (low-E) Coating:  Microscopically thin, undetectable, metal or metallic oxide layers applied onto or into a window or skylight glazing surface primarily to reduce the U-factor and solar heat gain coefficient (SHGC) by suppressing radiant heat flow. A typical type of low-E coating will let in normal light through a window but reflect summer heat back outside.   The coating allows short-wave energy to pass through but reflects long-wave infrared energy which improves the U-value and reduces solar heat gain coefficient.   In the winter, Low-E also helps retain furnace heat by reflecting the heat back into the home, rather than allowing it to escape through the window.  Low-E also reduces the damaging effects of UV rays that fade window coverings, carpet and furniture.

Lunette:  A crescent-shaped window framed by moldings or an arch.