Gambrel is a shortened name for a gambrel roof shape, a usually symmetrical two-sided roof with two slopes on each side. The upper slope is positioned at a shallow angle, while the lower slope is steep. This design provides the advantages of a sloped roof while maximizing headroom inside the building's upper level and shortening what would otherwise be a tall roof. The name comes from the Medieval Latin word gamba, meaning horse's hock or leg. The term gambrel is of American origin, the older, European name being a curb (kerb, kirb) roof. Europeans historically did not distinguish between a gambrel and a Mansard but called both types a Mansard. In the U.S.A., various shapes of gambrel roofs are sometimes called Dutch gambrel or Dutch Colonial gambrel with bell-cast eaves, Swedish ~, German ~, English ~ , French ~, or New England gambrel.
The cross-section of a gambrel roof is similar to that of a mansard roof, but a gambrel has vertical gable ends instead of being hipped at the four corners of the building. A gambrel roof overhangs the façade, whereas a mansard normally does not.
Origin and use of the term 
Gambrel is a Norman English word, sometimes spelled gambol such as in the 1774 Boston carpenters' price book (revised 1800). Other spellings include gamerel, gamrel, gambril, gameral, gambering, cambrel, cambering, chambrel referring to a wooden bar used by butchers to hang the carcasses of slaughtered animals. Butcher's gambrels, later made of metal, resembled the two-sloped appearance of a gambrel roof when in use. Gambrel is also a term for the joint in the upper part of a horse's hind leg, the hock.
Oliver Wendell Holmes, Sr. wrote: "Know old Cambridge? Hope you do.-- Born there? Don't say so! I was, too. (Born in a house with a gambrel-roof,-- Standing still, if you must have proof.-- "Gambrel?--Gambrel?"—Let me beg You'll look at a horse's hinder leg,-- First great angle above the hoof,-- That 's the gambrel; hence gambrel-roof.)."
The Dictionary of Americanisms, published in 1848, defines gambrel as "A hipped roof of a house, so called from the resemblance to the hind leg of a horse which by farriers is termed the gambrel." Websters Dictionary also confusingly used the term hip in the definition of this roof.
The term is also used for a single mansard roof in France and Germany. In Dutch the term 'two-sided mansard roof' is used for gambrel roofs.
Origins of the gambrel in America 
The origin of the gambrel roof form in North America is unknown. The oldest known gambrel roof in America was on the second Harvard Hall at Harvard University built in 1677. Possibly the oldest surviving house in the U.S.A. with a gambrel roof is the circa 1677-1678 Peter Tufts House. Note that the oldest surviving framed house in America, the Fairbanks House, has an ell with a gambrel roof but this roof was a later addition.
Claims to the origin of the gambrel roof form in America include: 1) Spanish, Portuguese, Dutch, and English mariners and traders had visited or settled in to the area of southeast Asia now called Indonesia prior to permanent European settlement in America. In Indonesia, they saw dwellings with a roof style where the end of a roof started as a hip and finished as a gable end at the ridge. The gable end was an opening, to allow smoke to dissipate from the cooking fires. This roof design was brought back to Europe and the American Colonies, and adapted to local conditions. The roof style is still in use around the world today; 2) Seamen who traveled to the Netherlands brought the design back to America; 3) or practical reasons such as a way to allow wider buildings, the use of shorter rafters, or to avoid taxes.
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Peter Tufts House, Medford, Massachusetts, believed to date from 1677-78.
Captain Moses W. Collyer House with gambrel roof.
Dwelling with gambrel roof at 108 Ocean Avenue in Amityville, New York.
If the date of construction and the roof of the Henry Bull House was original to the circa 1639 date this would be the oldest known example of a gambrel in America.
Another candidate for oldest gambrel roof, said to be from 1666, Alexander Standish House.
- Harper, Douglas. "gambrel". Online Etymology Dictionary. Retrieved 2010-11-13.
- Harper, Douglas. "gambol". Online Etymology Dictionary. Retrieved 2010-11-13.
- Oxford English Dictionary, 2nd ed., Gambrel:4.
- A New English Dictionary on Historical Principles: Founded Mainly ..., Volume 4. p. 36.
- US patent 1345112, W. A. Andrew, "Release gambrel", issued 1920-06-29
- Oliver Wendell Holmes, Sr., "Parson Turell's Legacy or, The President's Old Arm-Chair: A Mathematical Story", The Poetical Works of Oliver Wendell Holmes, Vol. 6, Poems From The Breakfast-Table Series (1857-1872). http://eremita.di.uminho.pt/gutenberg/7/3/9/7393/7393.txt accessed 2/3/2013
- Bartlett, John Russell (1848). "GAMBREL". Dictionary of Americanisms: a glossary of words and phrases, usually regarded as peculiar to the United States. American culture. New York: Bartlett and Welford. p. 153. OCLC 6758564.
- Kelly, John Frederick. Early domestic architecture of connecticut. Unknown: 1924, Dover Publications, Inc. reprint 1963. 63.
- Harris, Cyril M.. American architecture: an illustrated encyclopedia. New York: W.W. Norton, 1998. 144. ISBN 0393731030
- Allen, James H. (2010). Statics for Dummies. For Dummies. Hoboken, New Jersey: Wiley. p. 255. ISBN 978-0-470-59894-8. OCLC 505422830.
- Robert E. Lee Memorial Foundation. Stratford: Colonial Home and Plantation, Westmoreland county, Virginia: birthplace of Robert E. Lee and of two signers of the Declaration of Independence. Press of B. S. Adams, 1940. 27.