Basement Windows need replacing also and there are
special vinyl windows made specifically for replacing
old wooden or steel basement windows.
Most old basement windows swing in - either down or
up. The vinyl basement window is primarily a hopper
window also with the hinge side down and the oper-
ating handle and locks on the top of the sash.  
In some instances, a small slider window can be
used, as shown below.
The basic type of vinyl basement window is built
exactly like a regular double hung. It has a 3-1/4”
frame and 3/4” to 7/8” insulated glass.It will install
the same as a replacement window, i.e. against a
blindstop. If the old window is a steel type, the
instructions for removal and preparation of the 
opening found in the metal window section will be
basically the same for a basement window. 
For most wood windows installed directly to the
masonry, the old window has to be removed 
completely. Once the old window is removed, a 
wood “buck” can be fashioned from 1” x 4” or 1” x 6”
pine boards. These boards should be fastened to the
masonry opening on all four sides with concrete nails
or a power nailer. Be sure to mount them plumb and
square in the opening. 
A quality silicone
sealer can seal
where the wood
buck meets the
masonry. It is
advisable to use
treated lumber 
or use a sealer to
keep the wood
from rotting or
deteriorating.
Note: Once the
wood buck is in
position, you can
then calculate the
proper window
size to purchase.
Windows.
Removing Steel Basement Windows
Look at the section in the manual covering installing 
windows in Masonry. It will give you some informa-
tion on how the old window is anchored in the block
or masonry foundation wall. Using this information
you can either remove the old window and fashion
the new wood buck as shown here, or you can mount
the new window to the left-in-place old frame.
Installing
Basement 
Windows
Window Fitters Guide to Window Installation 
75                ©2022 AWDI, LLC Do not reproduce without permission
Old Steel Basement Window
Dryer Vent included in Hopper
Before: Old Wood Basement Window
After: New Hopper Basement Window
New Slider Basement Window
SAMPLE MANUAL

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