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What Is A Window Sill/Board? A window board is a piece of wood (or in our case premium MDF) that is found underneath a window. They are commonly referred to as window sills. Buy Window Boards Now What are they used for? A window sill's primary use is to cover the reveal at the bottom of the window. External walls are usually a lot thicker than a window and because they are fitted flush with the outs… Read more