Aluminium Door Finishes and Coastal Care: Colours, Coatings, Cleaning and Service Life

An aluminium door is usually chosen for its frame, its glass and its hardware, and then judged for years afterwards on its surface. The finish is the only part of the assembly that a client, a tenant or a buyer actually touches, and it is the part most exposed to sun, salt, rain and cleaning chemicals. When a door looks tired after a few seasons, the cause is rarely the aluminium itself. It is almost always a finish decision that was made late, a cleaning regime that was never established, or a drainage path that was blocked and forgotten.

This guide sets out how finish selection, colour choice, coastal exposure, cleaning, drainage, seals, glazing, hardware and repair escalation fit together for aluminium doors in Australian and New Zealand projects. It is written for architects, builders, joiners, strata managers, facility teams and owners who have to make a defensible decision and then live with it. It is deliberately restrained about numbers: coating performance depends on the specific product, the specific pretreatment, the specific exposure and the specific maintenance regime, so this article describes the categories and the decisions rather than promising a service life that no generic article can guarantee.

Why Finish Selection Belongs at the Start of the Project

A Finish Is a System, Not a Colour Card

The word “finish” covers several different things that are often discussed as one. It includes the surface pretreatment applied to the aluminium extrusion, the coating or anodic layer that provides the visible and protective surface, the colour or sheen that the coating delivers, the sealant and gasket materials that touch the coated surface, and the cleaning regime that will be applied after handover. Each of these interacts with the others. A coating that is perfectly adequate inland can be the wrong choice on a beachfront facade, not because the coating is poor, but because the surrounding decisions were made for a different environment.

Selecting the finish early matters because finish choices constrain almost everything downstream. Colour affects surface temperature and therefore thermal movement. Coating type affects how scratches can be treated and whether touch-up is even possible. Surface texture affects how visible dust, salt bloom and finger marks become. Pretreatment and coating quality affect how the door behaves at cut edges, at fixing points and at the base of the frame where water collects. By the time the door is being fabricated, most of these choices are locked, and the only remaining lever is maintenance.

What a Finish Has to Do

A door finish has four jobs, and they are not equally important on every project. The first is to protect the aluminium substrate from the environment, which for aluminium means limiting the time that water and chloride sit on the surface and limiting the opportunity for galvanic interaction with other metals. The second is to deliver the intended appearance consistently across every panel, every leaf and every adjacent window, including panels fabricated at different times. The third is to remain cleanable, meaning that the surface should tolerate the mild cleaning that a building will realistically receive rather than requiring specialist care that nobody performs. The fourth is to be repairable or at least touchable-up in a way that does not make damage more obvious.

When those four jobs are written into the specification as outcomes, the conversation changes. Instead of asking which colour is fashionable, the project asks which finish system is appropriate for this exposure, which appearance standard applies across the elevation, and what the owner will be expected to do every few months. That is a much better basis for a decision that will be judged a decade later.

Where the Finish Decision Sits Against Performance Evidence

Finish selection is separate from, but related to, the performance evidence for the door system. Structural, watertightness and air permeability performance are established by testing a specific system in a specific configuration, and that evidence is discussed later in this article under AS 2047 and AS 4284. The finish is part of the tested specimen, but the test does not measure how the coating will look after years of coastal exposure. A project therefore needs two separate conversations: one about tested performance, and one about finish durability and maintenance. Combining them into a single brochure claim is where misunderstandings begin.

Powder-Coated and Anodised: The Two General Categories

Powder Coating as a Category

Powder coating is a factory-applied organic coating. Dry powder is sprayed onto a prepared aluminium surface and cured in an oven to form a continuous film. As a category, it offers the widest colour range, including bright and dark colours, metallics and textured finishes, and it produces a film of measurable thickness that covers the extrusion uniformly on the visible faces. Because it is an applied film, it can be damaged by sharp impact, and deep damage that reaches the substrate is not something a site applicator can restore to factory appearance.

The performance of a powder-coated door depends heavily on what happens before the powder is applied. Pretreatment of the aluminium, the quality and consistency of the cure, the film build and the adhesion of the coating all matter more than the colour name on the sample. This is why two doors that look identical on a colour chart can behave very differently after several years in the same street. For a project, the useful questions are about the coating system and the pretreatment as a documented package, not about the colour alone.

Anodising as a Category

Anodising is an electrochemical process that grows a controlled oxide layer into the aluminium surface rather than adding a film on top of it. As a category, it produces a metallic appearance with a characteristic depth, and it is available in clear and in coloured variants, with different surface treatments before and after anodising affecting the final look. Because the oxide layer is integrated with the metal, an anodised surface does not chip or peel in the way an applied film can, but it can be scratched, and it can be marked by strongly alkaline or strongly acidic cleaning agents.

Anodised finishes are often chosen where a metallic appearance is wanted, where a very uniform appearance across large elevations is important, or where the design language is industrial or minimalist. They are also chosen where the project wants to avoid the visible film edge that appears when a coated component is cut or machined after coating. That advantage is real, but it does not remove the need for maintenance, and it does not make anodised aluminium immune to coastal salt.

Comparing the Categories Without Inventing Numbers

Comparisons between powder coating and anodising are frequently reduced to single figures, such as a number of years or a number of hours in a salt spray cabinet. Those figures are not transferable between products, and quoting them in a project document creates a promise that the supplier may never have made. A more honest comparison is qualitative and is set out below.

The table deliberately contains no performance figures. What it does show is that neither category is universally superior. The right choice depends on the appearance the design needs, the exposure the door will face, the maintenance the building will actually receive, and the evidence the supplier can provide for the specific system being offered.

What Should Not Be Claimed

Several claims are common in finish discussions and should be treated with caution. A coating does not have a single service life independent of where it is installed. Salt spray test duration does not translate into years of coastal life. Gloss retention figures measured on a test panel do not predict the appearance of a door that is washed twice a decade. A warranty period is a contractual statement about a defined defect under defined conditions, not a prediction of appearance. And a colour name does not describe a coating system: the same colour can be produced in different systems with different performance.

For a project specification, the safe approach is to require the supplier to state the finish system, the pretreatment, the colour and the appearance standard in writing, and to require that the maintenance instructions be issued with the product rather than left to a generic cleaning note in the building manual.

Colour, Solar Exposure and Surface Temperature

Why Colour Is a Technical Decision

Colour is usually discussed as an aesthetic question, but on an aluminium door it is also a thermal question. A dark surface absorbs more solar radiation than a light surface and therefore reaches a higher temperature in direct sun. That temperature difference matters for three reasons. It increases thermal movement of the frame and the leaf, which affects clearances, seals and hardware alignment over the life of the door. It increases the thermal gradient through the coating system, which is one of the mechanisms that stresses an applied film. And it changes how the surface feels and performs in relation to anything that touches it, including gaskets and sealants.

None of this means dark colours should be avoided. It means dark colours should be chosen with the exposure in mind, and the details that accommodate movement should be confirmed. On a west-facing elevation with long afternoon sun, a dark door in full sun is a different proposition from the same door under a deep eave or in a shaded courtyard.

Exposure Is Local, Not Regional

Two buildings in the same suburb can have very different solar exposure on their doors. Orientation, overshadowing from neighbouring structures, the depth of the eave or balcony above, the reflectivity of adjacent surfaces such as paving or glazing, and the amount of time the door sits in direct sun all change the real exposure. Reflected heat from a light-coloured paved area or from a neighbouring glass facade can add to the load on a surface that is not in direct sun at all.

A practical specification note is to record, for each elevation, whether the door is sheltered, partially sheltered or fully exposed, and to note any significant reflective surfaces nearby. That record does not need to be a thermal calculation. It simply gives the supplier and the builder a shared basis for discussing finish choice and movement details, and it gives the owner a reference point when appearance changes are noticed later.

Colour Consistency Across an Elevation

Doors are rarely installed in isolation. They sit next to windows, fixed panels, louvres and balustrades, often supplied as separate items and sometimes fabricated at different times. Colour consistency across all of these is a real project risk, particularly for bright and metallic colours, and particularly where the same nominal colour is produced in more than one plant or in more than one production run. The mitigation is procedural rather than technical: confirm that all components on a visible elevation come from the same finish specification and, where possible, the same production batch, and inspect components together in natural light before installation rather than in a showroom.

It is also worth agreeing at specification stage how appearance will be assessed. Natural light on site, viewed from a normal distance, is a very different standard from a close inspection under direct sun at a shallow angle. Writing down the viewing conditions prevents a dispute that is really about expectations rather than defects.

Coastal Salt as a Project-Specific Condition

Coastal Is a Spectrum

“Coastal” is used in the industry as if it were a single condition, but the exposure of a door on a headland taking prevailing onshore wind and salt spray is not the exposure of a door three streets back, sheltered by buildings and vegetation, even though both may be described as coastal. Distance from the surf line, elevation above sea level, prevailing wind direction, the amount of vegetation and built form between the door and the sea, and the frequency of onshore storms all change how much chloride reaches the surface and how often it is washed off by rain.

Because of that, this article does not define a coastal zone and does not offer a distance-based rule. The correct approach is to treat coastal exposure as a project-specific condition to be described and confirmed, and to ask the supplier what finish and maintenance regime they recommend for that described condition. The description should be written down, because it is the basis for every later conversation about appearance and durability.

What the Project Should Establish

A useful coastal exposure statement covers six things. First, the approximate distance and direction from the shoreline, including whether the shore is surf-exposed ocean or sheltered bay or estuary. Second, the prevailing wind direction and whether the elevation in question faces it. Third, the height of the door above ground and above sea level, since both affect spray deposition. Fourth, the sheltering provided by terrain, vegetation and neighbouring buildings. Fifth, whether the door is under an eave, balcony or recess, which determines how much rain washes the surface. Sixth, whether the building is in a location with regular atmospheric salt deposition that leaves visible residue on glass and surfaces.

With that statement in hand, the finish discussion becomes specific. Fully exposed, windward, unsheltered doors facing surf may justify a more protective system and a more frequent cleaning regime than sheltered doors on the leeward side of the same building. Where the building has mixed exposures, it is legitimate to record different maintenance frequencies for different elevations, provided the owner understands why.

Dissimilar Metals, Fixings and Cut Edges

Salt accelerates galvanic corrosion wherever two dissimilar metals are in contact in the presence of moisture and chloride. On an aluminium door, the vulnerable points are fixings, hinges, lock cases, closers, roller assemblies, and any steel or stainless component in contact with the aluminium frame. The choice of fixing and hardware material, and the use of isolating washers or separation tapes where required, therefore forms part of the coastal strategy, not a separate hardware question.

Cut edges and site-drilled holes are the other weak points. When a coated or anodised extrusion is cut or drilled on site, the protection at that edge is interrupted, and that is exactly where salt-laden water tends to sit. The response is to minimise site cutting, to specify where cutting is permitted, and to treat cut edges and drilled holes as the supplier directs. Sealant applied over an untreated cut edge is not a substitute for correct treatment, and in some cases it can trap moisture against the exposed metal.

Cleaning: The Regime That Actually Protects the Door

Cleaning Is a Design Requirement, Not Housekeeping

Cleaning is the single most influential maintenance activity for any door finish, and it is the one most often left undefined. A finish that is cleaned regularly with a mild method will usually outperform a nominally superior finish that is never cleaned. Salt, dust, pollen, insect residue and airborne pollutants all accumulate on horizontal surfaces such as the top of the head, the bottom track and the sill, and each of these deposits holds moisture against the surface.

The specification should therefore state a cleaning method and a frequency that the building can realistically sustain, and the handover pack should include the supplier’s own cleaning instructions. Where the supplier’s instructions differ from a generic building cleaning schedule, the supplier’s instructions should govern, because they are written for that finish system.

Method: Mild, Frequent and Thorough

The safe general method is to remove loose material first with a soft brush or a gentle water rinse, then wash with a mild detergent solution in lukewarm water using a soft cloth or soft brush, then rinse thoroughly with clean water, then dry the surface where practical. Rinsing is the step that is most often skipped and matters most in coastal locations, because rinsing is what removes the dissolved salt rather than simply redistributing it. Fresh water is the point of the exercise.

Frequency should follow exposure. Inland and sheltered locations can usually be managed on a longer cycle, while exposed coastal elevations may need attention far more often, particularly after storm events that deposit spray. Rather than commit to a single interval for a whole building, it is more useful to set a base interval and add an inspection after significant weather, with the option to increase frequency where residue is visibly returning.

What Not to Use

Several common cleaning practices cause avoidable damage. Abrasive pads, scouring creams and aggressive brushes scratch coated and anodised surfaces and leave a permanently visible area. Strong alkaline cleaners attack anodised surfaces. Strong acidic cleaners, including some descalers and cement removers, attack coated surfaces and can stain them. Solvent-based products may soften or dull a coating. Bleach-based products can leave residues that are difficult to rinse and can affect seals and gaskets. Cleaning agents should be mild, should be used at the dilution on the label, and should be rinsed off rather than left to dry.

Two further cautions are worth writing into the building manual. First, cleaning should never be done on a hot surface in direct sun, because the cleaning solution can dry before it is rinsed. Second, cleaning should be done from the top down so that dirty water does not run over surfaces that have already been cleaned. Both are simple disciplines that make a large difference to appearance over time.

Tracks, Sills and Drainage Paths

Sliding and stacking doors deserve particular attention because their tracks and sills collect debris. Sand, leaf litter, pollen and grit accumulate in the bottom track, hold moisture, and in time can block the drainage path. The track should be cleaned with a soft brush and a gentle water flush, with debris lifted out rather than pushed into the drain slots. Sill and threshold drainage openings should be checked at the same time and cleared if blocked.

This is also the point at which cleaning becomes inspection. A person cleaning a track is perfectly placed to notice a blocked weep hole, a hardened seal, a loose screw or a scratch, and to report it. Building manuals that treat cleaning and inspection as one task tend to produce better outcomes than manuals that separate them into two schedules that nobody coordinates.

Drainage and Water Management

Doors Are Designed to Get Wet

An external aluminium door is not intended to be waterproof in the sense of a sealed box. It is designed to shed most water at the outer face, to limit the amount that penetrates past the seals, and to drain away whatever does penetrate through deliberate paths. This is why sill and frame drainage exists. Water that enters the frame is collected and directed outward through weep slots or drainage openings rather than being trapped inside the profile.

The consequence is that drainage paths must remain open for the life of the door. A blocked weep slot converts a drained system into a container, and a container eventually overflows inward or corrodes from the inside. Blocked drainage is one of the most common causes of water appearing at the inside of a door that has performed correctly for years.

Slopes, Clearances and the Building Interface

Drainage also depends on the building around the door. The sill detail should shed water away from the opening, the external paving or deck should fall away from the threshold, and the head detail should not concentrate water onto the frame. Where a door sits at the bottom of a recessed opening or below an unsealed balcony, water can arrive at the threshold from directions the door was never designed to resist. In those cases the solution is usually at the building interface, not in the door.

Clearances matter as well. If the bottom of the frame is set into a mortar bed or sealed with a continuous bead that closes the drainage path, water has nowhere to go. The installation detail should show how the frame is supported, how the drainage openings are kept clear, and how the junction between frame and structure is sealed without blocking the path.

Sealant Joints: Sealing Versus Draining

Sealant performs two different jobs and they are often confused. On the external face, sealant keeps bulk water out of the junction between frame and wall. Behind and below the frame, the system must still be able to drain and ventilate. Applying sealant generously to every gap, in the belief that more sealant means more protection, frequently traps water where it cannot escape and can accelerate deterioration of the very materials it was meant to protect.

Sealant also has a service life of its own. It moves with the joint, it is exposed to ultraviolet light, and it eventually loses adhesion or elasticity. A joint that has started to fail should be cut out and replaced rather than patched, because a patch over a failing bead usually hides the problem rather than solving it. Sealant replacement is normal maintenance, and it should be included in the building’s long-term maintenance plan rather than treated as a defect.

Seals, Gaskets and Glazing

The Moving Joint Is Where Doors Differ From Windows

A door has a joint that opens and closes thousands of times, and that joint has to remain weathertight while the leaf moves, the frame moves thermally, and the building settles. The seals that manage this are usually compression seals, either in the form of gaskets, bubbles or fin seals, and their performance depends on being compressed by the right amount. Too little compression and the seal does not close the gap. Too much and the seal deforms permanently, the door becomes hard to operate, and the hardware carries load it was not designed for.

Seal condition should be checked as part of routine maintenance, particularly at the hinge side and the lock side where wear concentrates, and along the bottom of the leaf where the door meets the sill. A seal that has flattened, hardened, torn or detached should be replaced rather than adjusted around. Replacement seals should be the correct profile for the system; generic foam or brush seals fitted to close a gap often interfere with drainage and can hold water against the frame.

Glazing: Selection, Safety and Unit Integrity

Glazing in a door is governed by standards that address three distinct questions: whether the glass is strong enough for the loads and support conditions, whether it is appropriate for a location where people could impact it, and whether the sealed unit itself will remain intact in service. The relevant Australian references are AS 1288 for the selection and installation of glass in buildings, AS 2208 for safety glazing materials, and AS 4666, which addresses insulating glass units and their installation. In New Zealand, glazing and window performance requirements sit alongside the New Zealand building code and the product standards cited for certification.

The practical point for a finishes and care article is that glazing and finish are related at the perimeter. Glass is held by glazing beads, gaskets and setting blocks, and water that reaches the glazing rebate must be able to drain away from it. A rebate that is blocked, a gasket that has shrunk, or a bead sealant that has failed will allow water to sit against the edge of the glass and against the frame, which is precisely where coating damage and seal failure begin. Cleaning the glass with the same mild method described above, and rinsing the frame at the same time, keeps that perimeter in better condition.

It is also worth noting that glazing replacement is a common event in the life of a door, whether from impact, breakage or a failed sealed unit. When glass is replaced, the beads and gaskets should be renewed and the rebate cleaned and checked, rather than reused because they still look serviceable. A replacement that disturbs the finish at the bead line should be touched up according to the supplier’s instructions, and the event should be recorded.

Hardware in Coastal Service

What Fails First

Hardware is usually the first part of an aluminium door to show the effects of coastal exposure, because it has moving parts, small clearances, mixed materials and lubricant that degrades over time. Hinges, rollers, lock mechanisms, handles, flush bolts and closers all contain interfaces where moisture and chloride can sit undisturbed. The visible symptom is often stiffness, a change in the sound of the door, a handle that needs more force, or a dark stain appearing around a fixing.

The relationship between hardware and finish is direct. A stiff hinge transfers more load into the frame and the leaf, which can distort clearances and compress seals unevenly. A roller that no longer rolls smoothly causes the leaf to drag, which scuffs the track and can damage the bottom finish. Attending to hardware early protects the finish, and neglecting it is one of the ways a well-finished door begins to look tired.

Lubrication, Adjustment and Replacement

Lubrication should follow the hardware manufacturer’s instruction, using the specified product rather than a general-purpose oil or grease that may attract dust or attack seals. Silicon-based lubricants are commonly specified for sliding hardware because they do not gum up with dust in the same way as some petroleum products, but the specific recommendation for the specific hardware should always govern. Lubricant applied to a dirty mechanism simply traps the dirt, so cleaning comes before lubrication.

Adjustment is the second routine task. Hinges that have crept, rollers that have worn, and strikes that no longer align can usually be adjusted within the range the system provides. Adjustment should be recorded, because repeated adjustment in the same direction is a signal that a component is worn and should be replaced. Replacement parts should be the correct component for the system and should be suitable for the exposure; substituting a general hardware item in a coastal location often shortens the life of the whole assembly.

Scratches, Damage and Repair Escalation

Assess Before Touching

Damage to a finish should be assessed before anything is applied to it. The useful questions are: what caused it, how deep is it, has it reached the substrate, is it on a visible face, and is it in a location where water will collect? Damage that has exposed bare aluminium is a different matter from a surface scuff in the coating, because exposed aluminium in a coastal environment is where corrosion will start. Damage at the base of a frame or on a sill is more consequential than the same damage in a sheltered position, because water sits there longer.

Photographing the damage before any treatment is worthwhile. It establishes the condition at the time it was found, which is useful for a warranty discussion later, and it prevents the argument that a repair attempt made the damage worse.

What Can Be Handled On Site

Light surface marks, scuffs from handling and residues from adhesives or sealants can usually be dealt with on site using the supplier’s recommended cleaning method and a soft cloth. Adhesive residue should be softened with the recommended agent rather than scraped with a blade. Light scratches that do not penetrate the coating can sometimes be reduced in visibility using the supplier’s recommended method, but they should not be polished aggressively, because polishing thins the coating and creates a visibly different sheen in that area.

Beyond light marks, site repair is limited. Touch-up pens and aerosol products exist, but on a visible face they rarely match the factory finish, and on a large area they can look worse than the damage. For anodised surfaces there is no realistic site repair at all. The professional approach is to treat anything beyond light marking as a supplier conversation rather than a maintenance task.

When It Becomes a Supplier or Warranty Matter

Escalation is warranted when damage reaches the substrate, when corrosion is visible at a cut edge, fixing or sill, when the same defect appears across multiple doors, when a coating is lifting, blistering or chalking well beyond what the maintenance history would explain, or when the appearance of an elevation has changed in a way the owner did not expect. In each case the supplier should be given photographs, the door identification, the installation date, the exposure description and the cleaning history.

The cleaning history is the part owners most often cannot provide, and it is the part that determines the outcome of many discussions. A supplier asked to assess a finish with no maintenance record has to assume the worst; a supplier given a record of regular mild cleaning and timely hardware attention can assess the product on its merits. This is the strongest practical argument for keeping records, discussed next.

Repair or Replace

The decision between repair and replacement usually turns on visibility and function rather than on the size of the damage. A damaged component on a secondary elevation may be perfectly acceptable to repair cosmetically. A damaged leaf on the main entry elevation, where it will be seen every day, is usually better replaced or re-finished by the supplier. Where the damage affects the operation of the door, the seal line or the drainage path, replacement of the affected component is the safer default, because a compromised part tends to damage its neighbours over time.

Maintenance Records and Handover

What to Record

A maintenance record does not need to be complicated. For each door, it should identify the door by the same reference used on the drawings and in the window schedule, and record the finish system and colour as installed, the date of installation, the exposure description, the cleaning dates and method, any hardware adjustment or lubrication, any damage observed and action taken, any sealant or seal replacement, and any glass replacement. Photographs at handover and at each significant event make the record far more useful.

The record should also include the supplier’s maintenance instructions as issued, not a rewritten version. If the building manual summarises them, the summary should reference the original document so that the precise wording is available when it matters.

Why Records Matter at Warranty Time

Finish and hardware warranties are typically conditional on maintenance being carried out as instructed. That condition is reasonable, because appearance and corrosion outcomes depend heavily on cleaning in coastal environments. An owner who can produce a record of regular cleaning and prompt attention to damage is in a much stronger position than one who cannot, regardless of the merit of the claim.

Records also support the building’s longer-term planning. A strata or facility manager who can see that sealant replacement has been needed on one elevation but not another, or that hardware on the west-facing doors is adjusted more often, can budget and schedule work rather than react to failures. Maintenance records turn a series of unrelated complaints into a pattern that can be managed.

Service Life: The Variables That Actually Decide It

Service life is the question every owner asks and no generic article can answer with a number. What can be described honestly is the set of variables that decide it. The finish system and its pretreatment come first, because they determine the starting condition. The exposure comes second, because salt, sun and shelter determine the rate at which the surface is challenged. The maintenance regime comes third, and in practice it is often the most influential, because regular mild cleaning and prompt attention to damage will usually outperform a better finish that is neglected.

Installation quality then enters the picture. A door installed with blocked drainage, damaged seals, untreated cut edges or over-tight fixings will deteriorate faster than the same door installed correctly, irrespective of the finish. Hardware condition matters because stiff or worn hardware loads the frame and the seals. And the building itself matters, because a door under a deep eave with good runoff and no reflected heat is in a materially easier position than one at the end of an exposed walkway.

The practical conclusion is that service life should be managed rather than predicted. Specify the finish for the exposure, install it so that it can drain, clean it on a realistic cycle, keep the hardware working, and record what was done. Those five actions are within the control of every project, and they are what separate a door that still looks and operates well after many years from one that does not.

Standards and Compliance Context

NCC and the ABCB

In Australia, the National Construction Code sets the performance requirements for building work, and the Australian Building Codes Board administers it. For windows and external glazed doors, the NCC and its referenced documents establish requirements for structural performance, water penetration, energy efficiency and, for glazed elements, human impact safety. The NCC operates through performance requirements supported by deemed-to-satisfy provisions, and a project may also use a performance solution where the prescriptive route does not suit the design.

Finish selection is not, by itself, an NCC compliance item in the way that structural or energy performance is. But the finish sits inside the compliance chain in two ways. It is part of the product that must be installed as tested, and it affects durability, which is relevant to how the assembly performs over the life of the building. Projects should confirm with the building surveyor or certifier which edition and which state or territory variations apply to the permit, since adoption dates and variations differ.

AS 2047 and AS 4284: Product Performance and Test Evidence

AS 2047 is the Australian Standard for windows and external glazed doors in buildings, and it is the reference against which window and door systems are assessed for performance. AS 4284 covers the testing of building facades, including the laboratory testing that establishes structural, watertightness and air permeability performance for a specimen. Together, these standards produce the evidence that a system performs as claimed, and that evidence is specific to the specimen tested: its size, its configuration, its glazing and its hardware.

This specificity matters when a project changes any of those variables. A larger leaf, a different glazing make-up, a different mullion arrangement or a different hardware set may fall outside the tested configuration, and the project should ask for documented extension of the evidence rather than assume it. For finish discussions, the relevant point is that the tested specimen includes its finish and seals, and that installing a door with different seals, blocked drainage or altered hardware changes the assembly that was tested.

AS 1288, AS 2208 and AS 4666: Glass and Glazing

AS 1288 governs the selection and installation of glass in buildings, taking account of glass type, thickness, panel size and support conditions, and the loads acting on the panel. AS 2208 addresses safety glazing materials for locations where human impact is a consideration, which for doors includes the glazed areas people walk towards and through. AS 4666 addresses insulating glass units, the factory-made sealed units used where thermal performance requires them.

These three standards interact with the finish at the perimeter of the glass. The glazing system holds the glass through beads, gaskets and blocks, and the detailing must allow water that reaches the rebate to drain rather than sit. Where a project is replacing glass or a sealed unit, the reinstatement should follow the same standard basis as the original installation, and the finish at the bead line should be restored rather than left exposed.

New Zealand: SNZ TS 4211:2022 and SNZ 4223

New Zealand projects are assessed under the New Zealand Building Code by a building consent authority, with product information requirements that expect manufacturer data to be available and reliable. The window and door standards cited for certification include SNZ TS 4211:2022 and SNZ 4223. As with Australia, the evidence is product- and configuration-specific, and the consent documentation needs to show that the selected product, including its finish and glazing, is within the certified scope.

For finish and maintenance, the New Zealand context adds a practical emphasis on external moisture management, because the accepted solutions for drained and ventilated cavities, flashing sequence and air seals are prescribed rather than left to judgement. A door that drains correctly and is maintained correctly satisfies both the durability and the external moisture intentions of the code.

Meichen’s Verified Position

Meichen International Windows & Doors is an aluminium window and door manufacturer with 18 to 19 years of industry experience and a dedicated focus on the Australian and New Zealand markets since 2017. Manufacturing takes place in a 20,000 square metre facility, with aluminium supplied through AAG, glass through CSG, and hardware sourced from specialist ANZ hardware suppliers with more than ten years of experience in Australian and New Zealand requirements.

The Australian certification scope covers AS 2047, AS 4284, AS 1288, AS 4666 and AS 2208, with 43 product series certified. New Zealand certification covers 13 product lines against SNZ TS 4211:2022 and SNZ 4223. Product ranges include the ultra-slim coastal SD205-AS960 sliding and stacker doors, the SLMA100-20 slim sliding window, the MC140 sliding door, the MC100 series in awning, fixed, tilt and turn and double hung configurations, the MA73 bi-fold door, the MD150 series, the ApexAwning 100/150-AS960, and the BA150 curtain wall series, together with louvres, balustrades and shower enclosures. Water tightness for the relevant system has been tested up to 960 Pa under AS 4284, and that result applies to the tested system and configuration rather than to every door in the range.

Meichen is actively pursuing CodeMark certification, which is the highest level of product certification available in Australia. CodeMark is not currently held, and projects that require it should confirm the current status with the supplier at tender stage.

This article does not state a specific coating system, colour range, coating performance figure or coastal warranty position for Meichen products, because those details are product- and project-specific. Finish options, the applicable system for a given exposure, and the maintenance instructions that apply should be confirmed in writing with the supplier for the project in question.

Frequently Asked Questions

Does a darker colour shorten the life of an aluminium door finish?

Not automatically, but darker surfaces reach higher temperatures in direct sun, which increases thermal movement and stresses the coating system. The practical response is to consider the exposure of each elevation, confirm that the system is suitable for the intended colour, and make sure the installation accommodates movement. Colour choice should be a documented decision rather than a late selection from a sample fan.

Is anodising better than powder coating near the coast?

Neither category is universally better. Both depend on the specific system, the pretreatment and the maintenance regime. Anodising offers a metallic appearance and does not chip like an applied film; powder coating offers a wider colour range. The right question is which system the supplier recommends for the described exposure, and what maintenance that system requires.

How often should aluminium doors be cleaned?

There is no single interval that suits every building. Sheltered inland doors can be managed on a longer cycle than exposed coastal doors, and doors that receive salt spray may need attention after significant storm events as well as on a routine cycle. Set a base interval from the supplier’s instructions, inspect after weather events, and increase frequency where residue returns quickly.

Can I use a household cream cleaner on marks?

No. Abrasive creams and pads scratch coated and anodised surfaces and leave a permanent dull patch. Mild detergent in lukewarm water, a soft cloth, and a thorough rinse with clean water are the appropriate method. Stubborn residues should be treated with the agent the supplier recommends, not with an abrasive.

What causes water to appear inside a door that used to be dry?

The most common causes are blocked drainage slots or weep holes, debris in the bottom track, failed or shrunken seals, deteriorated sealant at the frame-to-wall junction, or a change at the building interface such as a blocked or redirected path for water. The door itself may be unchanged. Cleaning the drainage path and inspecting the seals is the correct first step.

Can a scratched door be repaired to look new?

Light surface marks can often be reduced, and small areas can be touched up, but a factory finish is not normally reproduced on site. On visible faces, touch-up is usually visible, and anodised surfaces cannot be locally repaired at all. Damage that has reached the substrate should be assessed by the supplier, particularly in coastal locations where corrosion can start at the damaged point.

Do I need to keep cleaning records for a warranty claim?

Yes, and it is in your interest to do so. Finish and hardware warranties are normally conditional on maintenance being carried out as instructed and on damage being reported promptly. A dated record of cleaning, hardware attention and any observed damage gives the supplier a factual basis for assessment and demonstrates that the product was maintained in accordance with the instructions issued at handover.

Should every elevation be cleaned on the same schedule?

Not necessarily. Different elevations can have materially different exposure depending on orientation, prevailing wind, shelter and runoff. A building with a windward coastal face and a sheltered rear courtyard may reasonably adopt a shorter cleaning interval on the exposed face. The important thing is that the difference is recorded and understood, rather than discovered when one elevation looks different from another.

Does the finish affect how the door performs in a storm?

The finish itself is not what keeps water out; the drainage design, seals, glazing detail and installation are. The finish affects durability and appearance rather than watertightness. That is why a maintenance programme that keeps drainage clear and seals intact protects the performance of the door, while a maintenance programme that only washes the visible faces protects its appearance.

Conclusion

Finish selection is a decision about how an aluminium door will age, and it belongs at the start of the project rather than at the colour selection meeting. Powder coating and anodising are two general categories with different strengths, different damage modes and different limits on site repair, and neither is universally right. What matters is the specific system, its pretreatment, the colour and surface temperature it creates, and the exposure it will face, described in project terms rather than in general coastal labels.

Coastal salt is a project-specific condition, and the response to it is a combination of appropriate finish specification, correct detailing at fixings, cut edges and drainage paths, and a cleaning regime that the building can actually sustain. Doors are designed to drain, and drainage only works while it remains clear. Seals, glazing perimeters and hardware are the components that deteriorate first and the ones that, if neglected, damage the finish around them.

Damage should be assessed before it is touched, light marks handled with mild methods, and anything reaching the substrate escalated to the supplier with photographs and a maintenance history. Records are what make that escalation productive and what support a warranty discussion years after handover. Standards provide the framework: the NCC and the ABCB for building requirements, AS 2047 and AS 4284 for product performance and test evidence, AS 1288, AS 2208 and AS 4666 for glazing, and SNZ TS 4211:2022 and SNZ 4223 for New Zealand projects.

None of this produces a guaranteed number of years, and any article that offers one should be read with suspicion. What it produces is a defensible process: specify for the exposure, install so the assembly can drain, clean on a realistic cycle, keep the hardware working, record what was done, and confirm every product-specific claim in writing with the supplier. That process is what carries a door from handover to long service with its appearance and operation intact.

References

1. Australian Building Codes Board. National Construction Code, performance requirements for building work. https://ncc.abcb.gov.au
2. Standards Australia. AS 2047, Windows and external glazed doors in buildings.
3. Standards Australia. AS 4284, Testing of building facades.
4. Standards Australia. AS 1288, Glass in buildings – Selection and installation.
5. Standards Australia. AS 2208, Safety glazing materials in buildings.
6. Standards Australia. AS 4666, Insulating glass units and installation.
7. Standards New Zealand. SNZ TS 4211:2022.
8. Standards New Zealand. SNZ 4223.
9. Meichen International Windows & Doors. Product ranges, certifications and performance data. https://mcwindow.com.au

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