What is an Astragal?

Definition of Astragal in Construction
Refers to a trim piece that covers the interface of assembled window or door units. There can be an interior or an exterior astragal to cover the point of assembly. Astragal is a general term used to describe a vinyl, wood, aluminum, steel piece that covers some type of connection, and can be used differently, dependent upon the trade, the region of the country and the application. Care must be taken when using this term due to its generality in the construction industry. Each area of the country and the world uses the term to mean various products or to describe different construction elements.