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From Wikipedia, the free encyclopedia

Eaves or soffit lining on a house in Northern Australia. The flat section (underside) would be referred to as a soffit. In this example the soffit is fixed to the slope of the rafters. The fascias form the outer edge and have a groove in them to receive the soffit lining sheets.
Eaves or soffit lining on a house in Northern Australia. The flat section (underside) would be referred to as a soffit. In this example the soffit is fixed to the slope of the rafters. The fascias form the outer edge and have a groove in them to receive the soffit lining sheets.
Soffit lining a house in Northern Florida, United States. In this example the soffit is 12 inches wide and made from center lanced U groove perforated sections of vinyl in a return fashion and fixed to a truss roofing system.
Soffit lining a house in Northern Florida, United States. In this example the soffit is 12 inches wide and made from center lanced U groove perforated sections of vinyl in a return fashion and fixed to a truss roofing system.
Soffit box providing a level mounting plane for kitchen ventilation hoods.
Soffit box providing a level mounting plane for kitchen ventilation hoods.
Four panels showing the construction and finishing of an improvised interior soffit used to hide a vent duct in Michigan.
Four panels showing the construction and finishing of an improvised interior soffit used to hide a vent duct in Michigan.

A soffit is an exterior or interior architectural feature, generally the horizontal, aloft underside of any construction element. Its archetypal form, sometimes incorporating or implying the projection of beams, is the underside of eaves (to connect a retaining wall to projecting edge(s) of the roof).

Etymology

The term soffit is from Italian: soffitto, formed as a ceiling; and directly from suffictus for suffixus, Latin: suffigere, to fix underneath).

Soffits in homes and offices

In architecture, soffit is the underside (but not base) of any construction element.

Examples include:

Description More precise synonym
undersurface or under-face of any overhanging section of a roof eave
underside of a cornice
underside of a flight of stairs, under the classical entablature
framework-filled area beneath kink of a chimney undercroft of chimney
wall into which loudspeakers are mounted in a recording studio wall with speaker recesses
curvature of e.g. plasterwork to fill the space above the kitchen cabinets, at the corner of the ceiling and wall coving (interior design)
underside of office ceiling of tiles (often gypsum) suspended, fastened or bonded to a grid system attached to the walls and/or ceiling false/suspended ceiling (tiles/grid) or dropped ceiling
underside of an arch or architrave (whether supported by piers or columns) underarches
lower (usually false) ceiling area to mask and allow egress of upper end of ventilation hood(s)/flues[1] false ceiling/lower ceiling beneath (multi-light/surround) lantern/raised skylight/dome/sloped upper ceiling

Under the eaves of a roof

In foremost use soffit is the first definition in the table above. In spatial analysis, it is one of the two necessary planes of any (3-dimensional) optionally built area, eaves, which projects, for such area to be within the building's space.

In two-dimensional face analysis it is a discrete face almost always parallel with the ground that bridges the gap(s) between a building's siding (walls) and either: their parallel extraneous plane (fascia) where such exists; or where no such plane, a point along (or the abrupt end of) the roof's outer projection (overhang). Soffits and fascias are archetypally screwed or nailed to rafters known as lookout rafters or lookouts for short, their repair being often undertaken simultaneously. A parapet wall or cornice tend to preclude eaves, as an alternate design, both favouring flat roofs and weather-proof walls. Very pronounced overhangs (eaves) are characteristic to European architecture to shield the walls from rain, sleet and snow such as Swiss chalet style, Dutch, Romanian, and Tudor architecture.

Soffit exposure profile (from wall to fascia) on a building's exterior can vary from a few centimetres (2–3 inches) to 3 feet or more, depending on construction. It can be non-ventilated or ventilated, to prevent condensation. A grill that covers the venting opening on the bottom of the soffit is called a soffit vent. A soffit joist can be added to the framework instead of or in addition to lookouts.

See also

References

  1. ^ "Range Hood Installation Under Sloped / High Ceiling". Futuro Futuro. Retrieved 15 November 2012.
This page was last edited on 28 April 2021, at 12:24
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