Gas: This is an inert gas that is
inserted into the space between the glass. The gas is less
dense than air and therefore transmits heat and sound at a
slower rate. This adds to the sound proofing of the window
and adds to the insulation value. Over time this gas will
dissipate thereby losing it's value.
System®: A window renovation system in which the
single pane glass is replaced with insulated glass while retaining
the original sash and a vinyl jambliner system replaces the
old weight and pulley or friction balance system.
Balances: These are balances that are cut into the side
of the sash and attach to the jamb so that they remain hidden
from view at all times.
This refers to the air that leaks around the sash and works
it's way into the weight pocket area in the wall. This infiltration
makes up 2/3's of the heat loss in a standard single pane
Glass: This is two pieces of glass that are bonded together
using aluminum, foam, or butyl spacers. They do not have a
vacuum between the glass, but either air or argon gas. They
come in different thicknesses depending upon the application.
The jambliner consists of a vinyl unit that has spring balances
installed into it to balance the window sash in its operation.
This replaces the old weight and pulley system . They have
a foam backing to prevent infiltration and weather-stripping
to prevent air leakage at the meeting rails.
E Glass: A major cause of winter cold spots and drafts
is window glass. Here's what happens: When it's 0 degrees
Fahrenheit outside and 70 degrees in the room, the inside
surface of the glass in a single pane window is a very chilly
14 degrees! You feel a cold spot next to the window. The cold
spot interacts with the warm air, setting up currents which
cause cold drafts. Under the same winter conditions with "Comfort-E"
low-E glass, heat reflected by the glass warms the inside
pane of double pane windows to about 56 degrees. Cold spots
are drastically reduced, so there's little opportunity for
convection currents to develop or for condensation to form.
Low E glass is glass with coating of tin oxide applied to
the surface of the interior pane. The coating also adds in
the "R" Value increasing the insulation value of the glass
by up to 10%. The coating also reflects approximately 60%
of the ultraviolet rays out of the house thereby reducing
fading of carpets, floors and furniture.
Rails: The meeting rails are the horizontal parts of the
sash that meet each other in the center of the sash.
A muntin is the grid work that separates the panes of glass
in a sash.
The rails of the sash are the horizontal pieces.
Value: This refers to the resistance to heat loss of any
object. This is the measuring system used to specify and grade
insulated glass. Single pane glass has virtually no R value
while insulated panels 7/16" to 3/4" thick range from 1.87
This is the wooden operable part of the window, that holds
the glass in place.
Locks: There are a variety of locks for window sash. The
standard is a cam lock with a definite modern look. Reproduction
brass locks are also available.
Divided Lights: This is a term used to describe a sash
that is no longer true divided (many individual pieces of
glass in one sash) but has muntins applied permanently to
the interior and exterior. In some cases there is a spacer
grid placed between the glass panels in the insulated glass
that match the muntin pattern.
bulb weather-stripping: This weather-stripping is a silicone
product that is used to seal the horizontal joints of a window
sash. It has virtually no memory therefore retains it shape
even after being compressed all winter long.
The stiles of a window sash are the two vertical pieces of
Balance: Tape balances have been used for over a hundred
years and take the place of the weight and pulley system.
They are mounted in the pulley holes and have a flat spring
tape that replaces the sash cord. this system is good for
large windows where vinyl is not an option.
Windows: Window made completely of extruded vinyl.
Pockets: These are the pockets the weights are housed
in. They are filled with insulation when the weights are removed.