Soffit

A soffit is an exterior architectural feature, generally the horizontal, aloft underside of the roof edge. Its archetypal form, sometimes incorporating or implying the projection of rafters or trusses over the exterior of supporting walls, is the underside of eaves (to connect a supporting wall to projecting edge(s) of the roof). The vertical band at the edge of the roof is called a fascia. A soffit of an arch is frequently called an intrados.

## Contents

* 1 Etymology
* 2 Soffits in homes and offices
* 3 Under the eaves of a roof
* 4 References

## 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

Main article: Engineering:Eaves

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 [2]. 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.

## References

1. ↑ "Range Hood Installation Under Sloped / High Ceiling". Futuro Futuro. http://www.futurofuturo.com/rangehood-FAQ-sloped-ceiling.php.
2. ↑ "Fascia Vents and Eave Vents" (in en-US). https://alpineventilation.com.au/product-category/eave-fascia-vents/.

* This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed (1911). "Soffit". Encyclopædia Britannica (11th ed.). Cambridge University Press.

* v
* t
* e

Roofs

Roof shapes|

* Barrel roof
* Bochka roof
* Bow roof
* Butterfly roof
* Clerestory
* Conical roof
* Flat roof
* Gable roof
* Gablet roof
* Gambrel roof
* Half-hipped roof
* Hip roof
* Onion dome
* Mansard roof
* Pavilion roof
* Rhombic roof
* Ridged roof
* Saddle roof
* Sawtooth roof
* Shed roof
* Tented roof

Roof elements|

* Attic
* Catslide
* Collar beam
* Dormer
* Eaves
* Flashing
* Gable
* Gutter
* Hanging beam
* Joist
* Loft
* Purlin
* Rafter
* Roof batten
* Roofline
* Roof ridge
* Roof sheeting
* Roof terrace
* Roof tiles
* Roof truss
* Roof window
* Skylight
* Wind brace

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