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). Soffit is derived from a French word that means "formed as a ceiling" and the Latin term "to fix underneath.
Its basic function is to help with attic ventilation as it has small holes that allow air through for circulation. Fascias and soffits are the boards that cover the ends of the roof rafters where they sit on top of the outer wall of a house.
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Sep Also, soffit helps your building breathe. With vented soffit, air can flow through the vents to provide regular air circulation to your attic.