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NC State Extension

Sill Plate – Defined

A wood plank that lays ‑at on top of a concrete or masonry foundation or wall that supports a floor or ceiling joist. The band joist and sill plate are the set of boards (in wood frame houses), or blocks (in a brick house) that sit on top of the foundation wall and run in a band around the house. Great video explaing band / sill and why you need to air seal this area.