|Replacement/Retrofit Window Terminology
Here are some basic window terms that
will help you better understand replacing your windows.
Head Jamb- Groove at the top
of the window which allows the window sashes to slide into place and
seat inside the window frame.
Upper Sash- The top portion of the
window comprised of a pane of glass set inside a frame. Is fixed in a
single hung window and slides up and down in a double hung window.
Glass Pane- In the window shown at
right there are two panes of glass, one in the top sash and one in the
Side Jamb- Grooves in window that
allows the window sashes to slide up and down or side to side.
Trim- The trim extends beyond the
end of the window frame on the outside of the window. This allows the
window to fit flush with the exterior wall when the window in
A wood trim member nailed to the window frame to hold,
position or separate window parts. The stop is often molded into
the jamb liners on sliding windows.
Lower Sash- The bottom portion of
the window comprised of a pane of glass set inside a frame. Is fixed in
a single hung window and slides up and down in a double hung window.
Sill- Located at the very bottom
of the window, the sill is usually sloped to allow water to run off the
bottom of the window in rain or during cleaning.
Flush Fin window-
A replacement window with flush fin is used when replacing an existing
aluminum sliding window. This is the most commonly used replacement window type.
Block Frame window-
A block frame window is used when replacing the wood sash of an old
double hung wood window.
Sloped Sill Adapter-
A sloped sill adapter is used to cover the gap between the old sloped
sill window and the new block frame window. It adapts a new window to the existing
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