Apron

The trim board below a window sill. The sides and top trim boards are called casing. When a window is trimmed without a sill, then all four sides of the window are trimmed with casing. Apron also refers to a trim board below a door threshold. A door can only have an apron on a side that has a step down from the threshold.

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2017-03-14T19:12:04+00:00