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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 ).
One common code requirement is that the total area of attic vents be equal to or greater than 1/150 of the floor area of the attic, with 50 percent or more of the vent area located in the upper portion of the attic. Vents and louvers should face away from prevailing winds to keep out driven rain. Soffit vents under the eaves normally provide ...
Eaves must be designed for local wind speeds as the overhang can significantly increase the wind loading on the roof. [7] The line on the ground under the outer edge of the eaves is the eavesdrip, or dripline, and in typical building planning regulations defines the extent of the building and cannot oversail the property boundary.
The two most common types of cornice return are the Greek return and the soffit return (also called a boxed or box soffit return). The former includes a sloped hip shape on the inside of the cornice under the eaves, which is sheathed or shingled like the rest of the roof above it and is considered very attractive; the latter is a simple return ...
The finished surface below the fascia and rafters is called the soffit or eave. In classical architecture, the fascia is the plain, wide band (or bands) that make up the architrave section of the entablature, directly above the columns. The guttae or drip edge was mounted on the fascia in the Doric order, below the triglyph.
Air transfer fire dampers in facades are vents applied in wall, eave soffit, gable or foundation. In the US, these are used to protect from exterior fire exposure from neighboring structure or via window-, arson- and wildfire (ASTM E2912 plus ASTM E119) or against wildfire only (ASTM E2886).
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