Glossary - L
A Glossary of window terminology
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
Lap
To overlap the ends of two siding panels or accessory pieces to allow for
expansion and contraction of the vinyl product.
Lift Handle
for raising the lower sash in a double-hung window. Also called sash
lift.
Lite
A unit of glass in a window.
Lug/Crimp
The raised “ears” or tabs on a siding panel, created by a snaplock punch,
which can be used to lock a siding panel into place when the nailing hem has
been removed.
Length of Embedment
The length of the fastener that penetrates the structure framing.
Level
A condition that exists when a surface is exactly horizontal.
Lever Operator
A window opening mechanism that has a handle that pivots right and left
to open and close an awning window.
Lock Block
A solid or glued block of wood the thickness of a hollow core interior
door or steel exterior door stile, which is joined to the inside edge of the
stile and to which a lock is fitted.
Lock Rail
The intermediate rail of a door at lock height.
Low-E (Low-Emissivity)
insulating glass
Low-E insulating glass provides the best year-round performance and
lowers energy costs by at least 15 percent (based on savings over clear glass).
Low-E glass features transparent microscopic layers of silver placed between
layers of anti-reflective metal oxide coatings. These coatings block 83 percent
of harmful UV rays and 96 percent of the sun’s infrared heat, so homes stay
cooler in the summer and interior furnishings fade less. In the winter, Low-E
helps keep homes warmer for improved comfort and reduces condensation. It also
delivers greater visible light transmittance than tinted glass.
Louver
An opening with a series of horizontal slats, called louver boards,
arranged sloping downward to permit ventilation but exclude rain, sunlight or
vision. Louvers can be made in various shapes.
Louver Door
A panel door with part or all of the panels replaced by louvers; a blind
door.