A Pennsylvania barn is a type of banked barn built in the US from about 1790 to 1900. The style's most distinguishing feature is the presence of an overshoot or forebay, an area where one or more walls overshoot its foundation. These barns were banked, that is set into a hillside to ensure easy access to both the basement and the level above. Almost all Pennsylvania barns also have gable roofs. Barn scholar Robert Ensminger classified the Pennsylvania barn into three types: Standard Pennsylvania, Sweitzer, and Extended Pennsylvania barns.: 56 The Pennsylvania-style barns were also built west of Pennsylvania and in Canada.
Standard Pennsylvania barn
"The Standard Pennsylvania barn is the most numerous and widely distributed class of the Pennsylvania barns.": 67 These were built between 1790 and 1890. The key characteristic in identifying this type is the forebay, which is built so that the gable end is symmetrical, with both front and rear walls being the same height.
Sweitzer barns are also known as Swetzer or Swisser. The name reflects the barn's probable origin from Switzerland. The Sweitzer is the "original Pennsylvania barn"; it was originally a log crib-type barn built between 1730 and 1850.: 56 The distinguishing feature of this type of forebay barn is that the forebay projects in a way that the gable end is asymmetrical.
Extended Pennsylvania barn
As agricultural productivity increased, the Standard Pennsylvania barn was not large enough, and this third class of barn was developed first by adding on to the Standard barn. New barns were based on the Standard but with more space added to the forebay side, ramp side, or by being made taller and adding another floor (storey) level.: 87
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- "Pennsylvania Barns" Archived 2009-05-14 at the Wayback Machine, Agricultural Architecture Field Guide, Pennsylvania Historical & Museum Commission. Retrieved 9 February 2007.
- Ensminger, Robert F. The Pennsylvania barn: its origin, evolution, and distribution in North America. 2nd ed. Baltimore: Johns Hopkins University Press, 2003.
- Charles Harris Whitaker, "Some Thoughts About Barns", Journal of the American Institute of Architects, October 1924