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What are Eaves?

By M. J. Reed
Updated May 16, 2024
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Eaves are the horizontal section of a roof that extends beyond the outside wall of a structure. The sloped connection between a gable or shed roof and an exterior wall is called a rake. Building eaves provide protection to buildings. The overhang created by eaves prevents rain, snow and other debris from spilling directly down the side of the building and causing damage to the siding or foundation.

In addition to their mundane function, roof eaves have historically been used as architectural features. In Dutch Colonial houses, the bottom tips of flared roof eaves curve up and away from the roof creating a silhouette reminiscent of traditional Dutch caps. Frank Lloyd Wright used sweeping, elongated eaves on his prairie style residential homes to create flowing lines seemingly connected with the earth. Traditional Asian architecture of the Zhou period took advantage of extended sloping building eaves to construct the intricate painted designs, as is common on pagodas.

There are four basic types of eaves: exposed, soffited, boxed-in and abbreviated. In an exposed eave, the finished underside of the roof and its supporting rafters are viewable from underneath. The soffited eave adds a finish, or soffit, board that connects the bottom tip of the eave with the side of the building at a 90 degree angle. This creates a smooth surface when viewed from beneath. A boxed-in eave also encases the roof rafters when viewed from below, but meets the side of the building at the same angle as the roof itself. An abbreviated eave is cut off almost perpendicular with the side of the house.

Eave detail for the exposed, soffited and boxed-in types of eaves includes air vents to prevent over-heating during warm weather and condensation leading to rot during cool/wet weather. Eave flashing is installed under roofing material and wrapped over the edge of the eave to prevent wind and water damage. This is especially important where the edges of the eave meet the gable, or rake.

Over time, the word eave has also come to mean the enclosed space between the intersection of the roof with internal and external walls of a building. This occurs in buildings where a portion, or the entirety, of the ceiling is parallel rather than perpendicular to the roof – creating a sloping ceiling – which is terminated at some point by a partial wall called a knee wall. The space between the knee wall and the outside wall is commonly called the eaves and is most often used for storage. This kind of eave is common in traditional New England cape and farmhouse style houses.

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Discussion Comments
By hanley79 — On May 15, 2011

I love houses with eaves! I think they give a building some kind of rustic, country-style or old-fashioned feel that new cookie-cutter residential homes just don't have these days. Because water isn't diverted away from the edge of the roof, buildings with eaves are the most likely type to collect icicles during the winter.

By gimbell — On May 14, 2011

When I was growing up, my parents' house had eaves of the unfinished variety that helped block out rainfall and run water off to make up for the fact that the house has no gutters on top.

Unfortunately, the unfinished dry wood on the undersides of the eaves made a great haven for hornets to make their nests! Dad always had to climb up on a ladder to the first and second stories of the house to spray the nests with hornet spray, otherwise the little devils would come flying in our windows all the time. If you're considering putting in unfinished eaves or buying a house that has them, keep things like the hornets in mind.

By watson42 — On May 12, 2011

In many old houses, or even new houses built to mimic them, eaves can be irritating. There is a room in my parents' house with very large eaves, but it's so hard to get rid of them. Suppose the house's structure would not become unsound, there is the question of cleaning, painting, and proofing whatever surfaces exist behind the eaves.

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