Astragal

An astragal is molding profile composed of a half round surface surrounded by two flat planes (fillets). An astragal is sometimes referred to as a miniature torus. It can be an architectural element used at the top or base of a column, but is also employed as a framing device on furniture and woodwork.

An astragal is commonly used to seal between a pair of doors. Exterior astragals are kerfed for weatherstripping. Also flush bolt hardware is commonly mortised into the astragal to hold the inactive door in place at the top and bottom.

It is related to Moulding.

Also known as “Meeting Stile Seals,” the term can refer to the raised half-round overlap where swinging doors meet. An astragal is designed to be applied to one or both doors of a pair at their meeting edges (meeting stiles). The astragal closes the clearance gap for the purpose of either providing a weather seal, preventing sound from leaking in or out of a room, minimizing the passage of light between the doors, or retarding the passage of smoke or flame during a fire.

Doors are typically the weakest link in any partition that is designed to block sound. This is often due to poor sealing around the perimeter of the door. Astragals, perimeter gasketing, drop seals and door sweeps can all be used to prevent sound from leaking through cracks around the door perimeter.

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  • astragal — ASTRAGÁL, astragale, s.n. 1. Unul din cele două oase mai mari ale tarsului. 2. Element decorativ de secţiune semicirculară, care separă fusul coloanei de capitel. – Din fr. atragale, lat. astragalus. Trimis de baron, 13.09.2007. Sursa: DEX 98 … …   Dicționar Român

  • Astragal — As tra*gal, n. [L. astragalus, Gr. ? the ankle bone, a molding in the capital of the Ionic column.] 1. (Arch.) A convex molding of rounded surface, generally from half to three quarters of a circle. [1913 Webster] 2. (Gun.) A round molding… …   The Collaborative International Dictionary of English

  • Astragal — steht für: das als Würfel dienende knöcherne Sprungbein (Griech. astragalos) von Tieren für das antike griechisch römische Würfelspiel Astragaloi eine bestimmte Profilform (in der Baukunst auch Perlstab), siehe Fries. Siehe auch: Astragalus… …   Deutsch Wikipedia

  • Astragal — (v. gr., Bauk.), s. Astragalus 4) …   Pierer's Universal-Lexikon

  • Astragal — (Perlenstab, Perlenschnur, Rundstab, Stäbchen), Bandmotiv mit halbkreisförmigem Querschnitt …   Lexikon der gesamten Technik

  • astragal — astràgāl m <G astragála> DEFINICIJA 1. arhit. ukrasni dio na stupu ispod kapitela, najčešće u obliku niza krupnih biserolikih izbočina 2. anat. jedna od nožnih koščica ETIMOLOGIJA grč. astrágalos …   Hrvatski jezični portal

  • astragal — [as′trə gəl] n. [L astragalus < Gr astragalos, anklebone, vertebra, architectural molding] 1. Anat. ASTRAGALUS 2. Archit. a small, convex molding, sometimes cut like beading …   English World dictionary

  • Astragal — As|t|ra|gal, der; s, e [lat. astragalus < griech. astrágalos, eigtl. = Knöchel] (Archit.): rundum laufende Verzierung, besonders zwischen Schaft u. Kapitell einer Säule. * * * Astragal   [Astragalos] der, s/ e,    1) antiker Spielwürfel, meist …   Universal-Lexikon

  • astragal — noun Etymology: Latin astragalus, from Greek astragalos neck vertebra, molding; akin to Greek astakos lobster, osteon bone more at osseous Date: 1563 1. a narrow half round molding 2. a projecting strip on the edge of a folding door …   New Collegiate Dictionary

  • astragal — n. [Gr. astragalos, vertebra] (MOLLUSCA: Gastropoda) The step sided, rounded elevations of a shell, that extend spirally around the whorls giving added strength …   Dictionary of invertebrate zoology


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