Installing 
Curved 
and Angled 
Windows
Vinyl Windows are made in more than just 
rectangular configuration. There are many choices 
of architectural shapes - round, half-round, quarter-
round, ovals, hexagons, octagons, trapezoids, and 
triangles. In fact, almost any shape can be ordered.
These odd shapes can add design flexibility to a
replacement or remodeling project, and they are
especially useful because they can fit into the most
unlikely places such as cramped stairwells and 
shallow attics. These window types generally don’t
have operating sash and they do not provide 
ventilation, but besides the decorative addition 
they make when used in combination with other 
windows, these special shapes, when used alone, 
can provide light in dark places, and their shapes 
will also add charm or traditional elegance.
Because they are shaped differently than rectangular
windows, special architectural shapes require some
modification to standard installation instructions. 
The following tips and illustrations are meant as
guides to determine the best way to proceed. Once
you have decided on the type of shape you want, 
consult your dealer or manufacturer for specific 
recommendations and available options for installa-
tion.
Installing Special Shapes
Special Shapes can be installed in two basic ways. 
If these shapes are ordered with a conventional 
double-hung, slider, or casement/awning type 
window, it may be possible to install them mulled
together with the rectangular window.
Header
King 
Stud
Jack 
Stud
Shim
Angled
Support
Window Fitters Guide to Window Installation 
94                ©2022 AWDI, LLC Do not reproduce without permission
SAMPLE MANUAL

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