One of the three principal design formats for pediments
is a rounded form: some portion of a circle. A plain window pediment
is a simple arch that mounts with either end aligned with the ends
of the breastboard, so that the arch appears to be an extension of
the rectangular window below. Plain window pediments are broad arches,
less than a quarter of a circle, extending across the wall above
the breastboard. While a breastboard can be milled with several steps
and a top lip to give the window frame some dimension, a plain window
pediment is a basic piece of unadorned moulding curving from corner
- Standard pediments require one more installation step in the
window framing process than pediments with attached breastboards.
- Many standard pediments, including plain window designs, are
produced today from synthetic materials such as polyurethane or
- Synthetic plain window pediments installed above the exterior
of a window will match wooden moulding nicely and will resist the
impact of weather better than wood will.
- Standard pediments in plain window designs can be mounted above
any type of window moulding during a remodel. Because there is
no attached breastboard a standard pediment will match up with
types of moulding, especially when a simple design such as the
plain window is used.
- Squaring the window frame and leveling the breastboard are
critical when you are mounting a pediment in order that the arch
- Pediments are a decorative addition that enhances any home,
whether used indoors or out.