What is an Astragal?

A molding attached to one or both doors of a pair at their meeting edges.


An astragal is an integral feature in the design and functionality of double doors, where it plays a significant role in sealing the gap between them to prevent sound, light, and air from passing through. Traditionally made from wood, astragals can also be crafted from metal, plastic, or other materials to match or complement the doors they are attached to. This molding typically runs the full height of the doors and can be plain or ornately designed, depending on the architectural style and preferences. Beyond its practical functions, an astragal also adds a finishing touch to the doors, enhancing their aesthetic appeal and contributing to the overall harmony of the interior design.


In residential settings, astragals are commonly found on double French doors leading to a patio or garden, providing an elegant transition between indoor and outdoor spaces. In commercial buildings, they are often used in conference rooms or offices where sound insulation is important. Moreover, in historical or traditional architecture, ornate astragals are used to add character and detail to double doors, reflecting the design period.


  • Can astragals be added to existing doors?

    Yes, astragals can be retrofitted to existing doors. They are available in various styles and materials to match the current door design.

  • Are there different types of astragals?

    Yes, astragals come in different types, including T-astragals, flat astragals, and surface-mounted astragals, each serving specific design and functional needs.

  • How are astragals installed?

    Astragals can be surface mounted or integrated into the door's edge. The installation method depends on the door design and the type of astragal.

Practical Application

When selecting an astragal for a double door setup, consider the door material, the desired level of sound and light insulation, and the overall interior design theme. Ensure the astragal complements the style of the doors and the room to achieve a cohesive look. For functional considerations, choose the appropriate type of astragal to effectively seal the gap between the doors.