Guides
Cast Aluminium Durability: Service Life and Upkeep
A cast leaf is bought for how it looks and kept for how it holds up. The two are connected, because a deep relief collects dirt in a way a flat panel does not, and a finish that reaches into that relief decides whether the face still reads after years of sun and rain. Durability here is a question about the finish, the seals and the core behind the face.
Where the durability actually sits
A cast leaf is thick where it needs to be, because the mould can vary the section around the hinges and the lock body. That mass resists the knock which dents a thin panel. The rest of the assembly does the weather work: the frame, the seals at the head and the bottom rail, the threshold and the finish over the whole face. A cast face on a poor frame is a heavy leaf on a weak opening.
Sun, rain and salt on a cast face
Ultraviolet light works on the coating rather than on the casting, and it shows first on the elevation taking the afternoon sun. Rain leaves a cast face alone where the relief drains, and holds in the pattern where it does not, which is why a deep detail needs a fall to the outside and a clear threshold. Coastal air adds chloride to the same surfaces and moves the finish choice to fluorocarbon.
Service life is the finish and the seals
In most coastal and desert installations, service life runs to the finish and the seals, not the metal. The casting outlasts the coating on it, the gasket at the bottom rail and the lock mechanism. That is not a weakness in the leaf; it is where the maintenance belongs. A door recoated before the substrate shows and resealed when the gasket hardens will outlast one left alone and repainted late.
The upkeep that changes the outcome
Four actions carry most of it: wash the face and let the relief dry, check the seal at the head and the bottom rail, keep the threshold clear so water leaves, and look at the hinge and lock for movement or stiffness. Recoat while the old finish still covers, because a spot repair on a sound coat is small and a strip and refinish is not. Colour is approved on the cast surface.
When cast is the better leaf
Cast wins where a single entrance has to carry a sculpted face, a deep relief or a heavy lock and hinge boss, and where the leaf reads as one piece from threshold to head. An extruded leaf wins on a repeat schedule, on glazing and on grille inserts, because the section is consistent and the cost follows the metre. Many projects use both, with one finish across all of it.
FAQ
Frequently asked
Is cast aluminium durable?
Yes, as a leaf. A casting can be thick where the hinges and lock sit, so it resists impact that dents a thin panel, and it does not corrode the way steel does. What limits the door is the finish and the seals, the parts that need attention over the years. The frame and hardware behind the leaf matter as much as the face does.
How long does a cast aluminium door last?
Longer than its first finish, in most coastal and desert installations, because the casting outlasts the coating and the gaskets. Service life depends on the exposure, the recoat interval and whether the threshold drains. A door inspected and recoated before the metal shows will serve far longer than one left until the finish fails.
Does the relief trap dirt?
It can, which is why a pattern is drawn with drainage in mind and the face is washed rather than scrubbed with an abrasive. A deep detail holds a film of dust in dry air and a film of salt at the coast, and water removes both. A texture that holds water is a design fault rather than a maintenance problem.
Cast or extruded for a coastal entrance?
Cast works where the entrance should read as one sculpted piece, and it takes fluorocarbon in salt air as readily as an extruded leaf. Extruded wins where the door repeats down a block or has to carry glass and grille inserts. Judge on the leaf build and the finish rather than on the production route alone.
What maintenance does a cast door need?
Washing, a seal check at the head and bottom rail, a clear threshold and an inspection of the hinge and lock. Recoating belongs on the plan before the old coat fails, not after. The work stays small in that order, and it is the difference between a face that still reads and one that has to be stripped.
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