In roofing terms, the soffit is the underside of the eave, that is, the area between the exterior of the house and the edge of the roofline. When we talk about installing a soffit, this typically refers to "boxing" in that underside of the eave to hide the rafters or trusses from view. The most commonly used materials for box soffits are plywood, cement board, and vinyl. It is important that the soffit be vented at regular intervals to allow air to flow in and out of the attic of a house, especially if that attic is non-livable space.
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