Astragals
A profile covering the gap between the two leaves of a double door, where there is no frame stile for the sealing element to close against. Configurations include T sections, overlapping sections and split sets cut to the opening. On fire-rated pairs the astragal forms part of the tested configuration, and it reduces clear opening width by the depth of its section.
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Frequently asked questions
Should I choose a T astragal or an overlapping astragal?
A T astragal is fixed to the face of one leaf, with the flange of the T spanning the gap and bearing on the other leaf. An overlapping astragal has a lip on the active leaf that laps over the inactive leaf. Both require the leaf carrying the astragal to close last, so a pair with closers on both leaves needs a coordinator to set the closing sequence.
When is a split astragal set used?
A split set has one section on the meeting edge of each leaf, making contact in the middle of the gap. It lets each leaf open independently with no closing sequence, which suits egress pairs with panic hardware on both leaves.
What should I measure to order a replacement astragal?
You need the leaf height, the gap between the leaves when closed, the leaf thickness and the handing (which leaf is active, and whether it swings in or out). On doors with top and bottom flush bolts, note the bolt positions so the astragal does not cover the bolt holes.
Can I replace the astragal on a fire-rated pair with a different one?
On a fire-rated pair the astragal is part of the tested configuration, so replace it only with the type listed in the door documentation or approved by the door manufacturer. A different material or section can void the fire rating of the opening.
Does an astragal reduce the clear opening width?
Yes. The section projects into the opening and reduces clear width at 90 degrees by its depth. On escape routes or trolley routes, check the required minimum width before choosing a section.
How are astragals fixed to the door?
Most metal astragals are screwed through pre-drilled holes into the leaf edge or face; on hollow steel leaves, self-drilling screws or blind rivets are used. Astragals with a replaceable sealing insert are preferable, because a worn insert can be pulled out and a new one fed in without removing the bar. Keep screw spacing even along the length so the bar does not bow and open a gap at mid-height.
Do astragals help with acoustic and dust control?
The meeting stile gap is usually a straight opening running the full height, so on a pair of doors it is a major path for sound and dust after the bottom gap. An astragal with a rubber or silicone insert bearing on the opposite leaf closes this path far better than a plain metal bar. For cleanrooms or acoustic rooms, choose an astragal with a continuous sealing insert and pair it with head seals so no gap remains at the top corner.
What finishes are available for astragals?
Aluminium astragals are commonly clear anodised, bronze anodised or powder coated to match the door, while steel astragals are often supplied primed for site painting. In damp or washdown areas, stainless steel is the more durable choice. When ordering, state the finish together with the profile so the astragal matches the other hardware on the leaf.
