soffit

American  

[sof-it] / ˈsɒf ɪt /

noun

Architecture.

1. the underside of an architectural feature, as a beam, arch, ceiling, vault, or cornice.

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soffit British  

/ ˈsɒfɪt /

noun

1. the underside of a part of a building or a structural component, such as an arch, beam, stair, etc

2. Also called: crown.   vertex.  the upper inner surface of a drain or sewer Compare invert

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Etymology

Origin of soffit

1605–15; < French soffite < Italian soffitto < Vulgar Latin *suffīctus, for Latin suffīxus; see suffix

Explanation

A soffit is the underside of a part on a building, like a protective covering under the eaves of a house, or the surface of an arch as seen from below. The word soffit traces back to the Latin word suffixus, meaning “fastened below.” So when your dad asks you to help replace the soffit, you know you’ll be dealing with the underside of some part of a building. The most common type of soffit is the one you’ll see on the underside of the eaves, running from the outside wall to the outer edge of the roof.

Example Sentences

Don’t pile insulation around the edges, however, because that would block the soffit vents.

From Washington Post • Nov. 23, 2021

Why is this soffit tucked into the southeast corner of an eave?

From New York Times • Jul. 1, 2020

He found deteriorating paint, rotting soffit and fascia, a hole in the roof.

From Washington Times • Feb. 22, 2020

“A light glow will project from the building facade while the soffit underneath the building canopy will include a lighting feature that emulates a ‘starry night,’ ” a design slideshow reads.

From Seattle Times • Aug. 16, 2016

The hard, ringing noise from under the soffit, so much unlike any sound to be heard in an earth tunnel, was disturbing.

From "Watership Down: A Novel" by Richard Adams