Aluminium Louvre Screens and Windows: Sun Control, Privacy and Ventilation Coordination

An aluminium louvre looks like a simple thing: a row of blades in a frame. In practice it is one of the most heavily compromised components on a façade, because a louvre is usually asked to do three jobs that pull in opposite directions at once. It must keep sun off glass and off people, it must stop neighbours and passers-by from seeing in, and it must still let air through. Every blade angle that improves one of those outcomes degrades another. Add the practical realities of fixing brackets into a substrate that may be brick, concrete, timber or a thin rainscreen panel, a coastal atmosphere that attacks anything left unprotected, a drainage path that has to work in driving rain, and a glazed opening sitting directly behind the screen, and the louvre stops being a decorative add-on and becomes an interface problem. This guide sets out how louvre screens and louvre windows differ, how the competing objectives should be ranked before any product is selected, and how orientation, brackets, drainage, corrosion protection, coatings, glazing interfaces, maintenance and the Australian and New Zealand compliance framework fit together. It is written for architects, builders, developers, façade consultants and owners who need a specification that survives contact with a real site.

What a Louvre Screen Is, and What a Louvre Window Is Not

The first source of error in most louvre projects is linguistic. The same word is used for a fixed external screen and for an operable window, and the two are specified, tested and installed under completely different assumptions. Getting the terminology right at the briefing stage prevents most of the expensive mistakes later.

The screen as an outer layer of the façade

A louvre screen is a secondary skin. It is mounted outside the primary envelope, in front of a window, a wall, a balcony, a plant area or a car park opening, and it is intended to modify the environment behind it rather than to close it. The building remains weathertight because of the wall and the window behind the screen; the screen is not the weather seal, and it should never be detailed as though it were. That distinction has consequences. A screen can be relatively open, because water and air that pass between its blades are still handled by the drained and sealed construction behind it. Its brackets can be designed for wind load on the blades and frame alone, without the added responsibility of keeping the interior dry. And because it is a separate element, it can be removed, adjusted or replaced without opening the building envelope.

The louvre window as an operable window

A louvre window is a window. The blades are the closing element, they sit within a window frame that is fixed into the wall, and when the window is closed the assembly is expected to resist air infiltration, water penetration and wind load as a window does. The blades are glazed, the frame carries gaskets and drainage, and the unit has an operator, usually a handle, lever or crank, and often a mechanism that turns every blade at once. Because it is a window, its performance is a window performance question: the frame profile, the glazing, the seal between blade and frame, the drainage of the sill, and the installation of the frame into the wall all matter, and all of them are the things a project should be asking a supplier to document.

The practical difference is therefore one of responsibility. With a screen, the envelope behind it is already complete and the screen is an environmental filter. With a louvre window, the louvre is the envelope, and everything that follows in this article about drainage, sealing, glazing and testing applies with far more force.

Where the two meet

Many projects combine them: a louvre window for ventilation, protected by a fixed screen for sun and privacy, or a bank of fixed louvres above an operable window. These hybrid arrangements can work very well, but they multiply the interfaces. The screen changes the wind pressure and the rain angle that the window behind it experiences, it can trap heat between the two layers, and it makes access for cleaning and maintenance harder. The design should be drawn as a single assembly with a clear sequence of layers, not as two products bought separately and expected to coexist.

Defining the Brief: Solar Control, Privacy and Ventilation Are Different Problems

Before a blade profile is chosen, the project needs to state which of the three objectives dominates, on which elevation, at which time of day and in which season. A brief that says the louvre must provide sun control, privacy and ventilation without ranking them leaves the designer to guess, and the guess is usually resolved in favour of whichever objective is easiest to draw.

Solar control

Solar control is about intercepting direct radiation before it reaches glass or occupants. A louvre blade works in two ways at once: it blocks the direct beam, and it absorbs or reflects energy that then has to go somewhere. The first effect is geometric and depends on the sun angle relative to the blade angle. The second is a materials and finish question, and it is the reason a dark blade in still air can become noticeably hot while a lighter, more reflective finish behaves differently. Because the sun path changes through the day and through the year, a fixed blade angle is always a compromise, and the compromise should be chosen for the season and the hour that matter most to the brief, not for the average.

Where the screen sits in front of glazing, its shading effect also interacts with the glass. A shaded window receives less direct radiation, so the glass performs differently from the same glass unshaded, and any energy modelling done for the project should reflect the screen rather than the bare opening. This is one of the clearest examples of why screen and glazing have to be specified together.

Privacy

Privacy is a viewing-angle problem, not a coverage problem. A louvre that completely blocks a view from one position may offer a clear view from a different height or a different distance, particularly where the observer is looking up from the street or down from a neighbouring upper floor. The design question is therefore: from where must the interior be screened, and from where is screening unnecessary or even undesirable? A bathroom window needs protection from close neighbours at eye level; a living room may want an open outlook with screening only at the ends of the day. Resolving this requires a site section with sight lines drawn from actual observer positions, not an assumption that a louvre is private by nature.

Privacy also has a night-time dimension that is often missed. When the interior is lit and the exterior is dark, the viewing direction reverses in practical terms: the occupant becomes the visible subject. A screen that reads as opaque by day can read as a lit display by night if the blade overlap is modest.

Ventilation

Ventilation needs an uninterrupted path for air, from an inlet to an outlet, at a rate that serves the space. A louvre contributes an open area, and that open area is reduced by every element in the way: the blade depth relative to the blade pitch, the frame, mullions, any insect mesh, and the screen’s own brackets. The free area at the face of the louvre is not the same as the effective area through the depth of the blade set, and it is not the same again as the area available at the opening behind it. A generous louvre in front of an undersized opening ventilates like the opening, not like the louvre.

For a louvre window, ventilation is controlled rather than continuous: the blades open to a chosen angle, and the angle determines both the airflow and the rain resistance. That is a genuine advantage in climates with sudden weather, but it also means the window depends on occupant behaviour, and a window left partly open in a storm is a window that will be asked to do something it was not designed for.

Where the goals conflict

The conflicts are predictable. Deep blades at a steep angle give good shade and good privacy, and poor ventilation and poor daylight. Shallow blades at a shallow angle give generous airflow and a wide view, and little shading. Fully closed blades give privacy and no ventilation at all. Dense screens in front of a window reduce both unwanted solar gain and wanted daylight, so a room can become gloomy and still overheat if the screen is dark and the glazing behind it is ordinary. The honest approach is to accept the trade-off explicitly, document the reasoning, and let the elevation express that reasoning rather than pretending a single angle solves everything.

Orientation and the Sun Path

Orientation is the single largest determinant of how a louvre performs, and it is free. A blade set that is well matched to a north elevation can be actively wrong on a west elevation, because the sun arrives at a different altitude and azimuth and therefore meets the blade geometry from a different direction. The design should start with a sun path study for the specific latitude, overlaid on the specific elevation, before any product literature is opened.

What each elevation asks for

Elevations that receive high-angle sun for much of the day are generally the easiest to shade with horizontal blades, because the geometry works with the sun rather than against it. Elevations that receive low-angle sun, particularly in the late afternoon, are the difficult ones: horizontal blades tilted to block a low sun also block the view and the breeze, and the screen may need a different blade orientation, a vertical arrangement, or a combination. East elevations bring low morning sun and are often dealt with by accepting some early gain in exchange for an open outlook. The point is not to prescribe an angle here, but to insist that the angle is derived from the actual sun path rather than from a catalogue photograph.

Wind, not only sun

Ventilation strategy depends on prevailing breezes as much as on shading. A louvre designed purely for shade can sit directly across the summer breeze, and a screen that shelters a window from wind-driven rain may also shelter it from the cooling wind the room needs. On exposed sites, the screen can be useful precisely because it breaks the wind before it reaches an open window; on sheltered sites, the same screen may be unnecessary obstruction. Local wind data, terrain and the height of the building all belong in the analysis.

Neighbours and overlooking

Orientation also determines the privacy problem. The relevant question is not the compass bearing but the position of the nearest observer, which may be a neighbouring balcony, a second-storey window, a public footpath or a future development permitted on the adjoining lot. Where overlooking is likely to change, a screen that can be adjusted or supplemented later is worth more than one that is optimised for today’s site conditions and sealed in place.

Brackets, Fixings and the Structural Question

A louvre screen is a sail. It presents an area to the wind, it is mounted on brackets that create a lever arm from the fixing point, and it transfers that load into whatever the brackets are fixed to. Most failures of louvre installations are not failures of the blades; they are failures of the connection, the substrate, or the assumption that the substrate was what the drawing said it was.

Reading the substrate

The fixing design must begin with a verified substrate, not an assumed one. Structural concrete, masonry with a cavity, lightweight cladding panels, fibre cement sheeting, timber framing and steel studs all accept fixings in different ways and tolerate different loads. A screen fixed through a rainscreen panel into the structure behind it behaves quite differently from one fixed to the panel itself, and a cavity of unknown depth is a connection of unknown capacity. Where the substrate is uncertain, the correct response is investigation, not a longer screw.

Brackets, standoff and access

Brackets set the screen off the wall, and that standoff has three consequences. It defines the gap through which the screen can be cleaned and the wall behind it inspected. It determines the lever arm on the fixings. And it sets the depth of the pocket of air between screen and wall, which affects both the thermal behaviour of the assembly and the amount of rain that can be driven into the gap. A minimal standoff looks neat and leaves no room to work; an excessive standoff loads the connection without proportionate benefit. The bracket should be a designed component with a stated adjustment range, not a folded strap chosen on site.

Movement, tolerance and adjustment

Aluminium moves with temperature, and long runs of louvre accumulate that movement. Fixings and brackets should allow for it, and the frame should be detailed with joints that accommodate expansion rather than resisting it. Site tolerance matters too: a screen fabricated to millimetre precision and installed against a wall built to normal construction tolerance will either not fit or will be forced, and forcing a louvre frame distorts the blade alignment that the whole appearance depends on. Slotted connections, shims and a stated adjustment allowance in the brackets are what make a precise product installable on an imprecise building.

Drainage and Water Management

Louvres are not watertight, and a design that assumes they are is the most common source of complaint. The correct expectation is that some water will pass the blade line under wind-driven rain, and the assembly should be detailed so that the water which passes is collected, directed and discharged without entering the building. This is a design responsibility that sits with the whole assembly, not with the louvre supplier alone.

Blades, gutters and the free edge

A blade profile does several things: it turns the sun, it stiffens itself against wind, and it forms a small channel along its leading edge. That channel is useful, because water running down the face of a blade can be caught and carried to the end rather than allowed to drip off the middle of the span. But the channel only works if its ends are open. If the blade is capped, siliconed or fitted with a tight end plate, the channel fills, overflows and begins to discharge along its full length, which puts water exactly where the design intended it not to go. Blade end details are small and they are almost never shown on a drawing, which is why they should be.

The free edge of each blade also determines how water leaves. A blade with a drip detail sheds water cleanly; a blade with a flat underside tends to hold a bead along its edge and release it later, often onto whatever is below. On a screen in front of a window, that means water arriving at the head of the window in a concentrated line rather than as a diffuse film.

Screen in front of a drained opening

Where a louvre screen protects a window, the window behind it still has to drain, and the screen must not discharge into the window’s own drainage zone. Ideally the screen sheds water outside the plane of the window head and away from the sill, and the gap between screen and wall is detailed so that water running down the wall cannot be trapped against the frame. A screen mounted tight to the wall, with its bottom edge below the window sill and no outlet, creates a small reservoir that keeps the wall and the frame wet long after the rain has stopped. That is a durability problem as much as a waterproofing one.

Head, jambs and sill

Three details decide whether the assembly behaves. At the head, the screen should not create a ledge that collects water against the wall; a weathering detail above it, or a gap that allows water to pass, is preferable to a horizontal cap. At the jambs, the screen should be separated from the wall so that water can escape and air can dry the gap. At the sill, the base of the screen should sit clear of the finished surface with a defined outlet, rather than being bedded in mortar or sealed to the paving. Each of these is a small decision made on site by someone who may not have seen the design intent, which is why the intent has to be drawn and written.

For a louvre window, drainage follows window logic rather than screen logic. The frame has a sill with a collection channel, outlets at the low points, and a path from the glazing rebate into that channel. Blades close against gaskets, so the seal depends on the gasket compression being consistent along the blade, which in turn depends on the frame being square and the mechanism being correctly adjusted. A louvre window that leaks is usually a louvre window whose blades do not meet their gaskets evenly, or whose sill outlets are blocked.

Corrosion, Coatings and the Coastal Question

Aluminium is chosen for louvres because it does not rust and because it can be formed into precise, thin profiles. It is not immune to attack, however, and the environments where louvres are most useful, being exposed façades with wind, salt and rain, are also the environments that test the finish.

Alloy, temper and finish together

Corrosion resistance is a property of the whole system: the alloy and temper of the extrusion, the surface preparation before coating, the coating itself, and the fixings and accessories in contact with it. A good coating on a poorly prepared surface will fail at the interface; an excellent extrusion assembled with incompatible fasteners will corrode at the fasteners. The specification should therefore name the finish system and the fastener material together, and should require that they are compatible with each other and with the environment.

Powder coating and anodising

Powder coating provides a continuous film with good colour stability and a wide choice of finishes, and its durability depends heavily on pre-treatment and on film integrity at cut edges, drilled holes and site-damaged areas. Anodising converts the aluminium surface itself into a hard oxide layer, giving a metallic appearance and good resistance to abrasion, but it is less forgiving of deep scratches and its colour range is narrower. Neither finish is a substitute for design: sharp edges, water traps, unsealed joints and dissimilar metal contact will degrade both.

Dissimilar metals and fixings

Where aluminium meets steel, stainless steel or masonry fixings in the presence of moisture, galvanic action is possible, and the aluminium is usually the metal that loses. The correct response is isolation: separating washers, isolating tapes, compatible coatings on the steel, or the selection of fasteners that are appropriate for the environment. On coastal sites this is not a refinement but a basic requirement, and it applies to every screw, rivet, bracket and anchor in the assembly, including those hidden behind the blades.

Cleaning as corrosion control

Salt and airborne contaminants sit on surfaces and hold moisture against the coating. Washing removes them. A louvre that is never cleaned accumulates a film on the upward-facing surfaces of the blades and in the joints where water sits, and that film is where the finish will fail first. The cleaning regime is therefore part of the corrosion specification, and it should be written into the maintenance schedule with the access method that makes it possible.

Glazing Interfaces and AS 1288

Where a louvre screen or a louvre window involves glass, the interface needs explicit design attention, because glass introduces its own structural, safety and thermal requirements and because the louvre changes the conditions the glass experiences.

A screen in front of glazing

The screen reduces the radiation reaching the glass, which changes the temperature profile through the glazing. It also reduces the wind reaching the glass, and it can change how the glass is cleaned. From a safety perspective, the screen is a barrier in front of the glazing, and its own blades must be secure: a blade that works loose at height is a falling-object risk quite separate from the glass. From a maintenance perspective, the gap between screen and glass has to be wide enough to allow cleaning, because a glazed surface that cannot be reached will eventually become opaque and the occupant will remove the screen to get at it.

Louvre windows and glass

In a louvre window the glass is the blade, so the glazing is part of the operating mechanism. Glass selection must satisfy the safety glazing requirements that apply to the location and size of the pane, which in Australia is the province of AS 1288 and the associated safety glazing provisions, and the glazing must be held in the blade in a way that survives operation, wind load and thermal movement. Blade glazing that is simply bedded and left to friction is a maintenance liability.

Thermal and acoustic interaction

An external screen changes the thermal behaviour of the window behind it by shading and by creating a ventilated or unventilated cavity. An unventilated cavity can become hot, which is not always an improvement. On acoustics, a screen can scatter sound and may reduce the noise reaching the glass, but any such effect is configuration-specific and should not be assumed from the presence of blades. Where acoustic or thermal performance is a project requirement, it belongs in the performance documentation for the assembly, not in a general statement about louvres.

Performance Claims: Project-Specific, Not Generic

Louvre products attract loose language. Brochures describe blades as “cyclone rated”, screens as “privacy guaranteed” and systems as “weatherproof”, and none of those phrases carries a defined meaning. A specification should replace them with statements that can be checked: the configuration tested, the standard applied, the test report referenced, and the project conditions the result is claimed for.

What a credible claim looks like

A credible claim names the exact product and configuration, identifies the standard and the test method, cites a report that can be produced on request, and states the size and fixing conditions under which the result applies. A claim that is transferred from a different blade profile, a different span, a different frame or a different fixing arrangement is not a claim about the product being supplied. This is not pedantry: it is the difference between a document that will satisfy a certifier and one that will not.

Reading a watertightness figure correctly

Meichen documents water tightness of up to 960 Pa under AS 4284 for elements of its window and door range. That is a pressure figure obtained in a laboratory test on a defined window assembly, and it says something meaningful about the sealing and drainage design of those systems. It is not a figure for a louvre screen, it is not a rainfall intensity, and it does not mean a louvre will keep out all water. Any project that wants a comparable statement for a louvre assembly has to obtain it for that assembly, by test or by an engineering assessment that states its basis.

Mock-ups and site verification

Because louvre performance depends so heavily on brackets, gaps, flashings and installation, a mock-up is often more informative than a data sheet. A mock-up built with the actual substrate, the actual bracket and the actual interface details can be water tested and inspected, and defects found there are cheap to correct. Where a mock-up is not practical, the alternative is a documented inspection regime at the interfaces before they are closed.

The Compliance Framework: NCC, ABCB and the Product Standards

In Australia the National Construction Code, issued under the authority of the Australian Building Code Board, sets the performance requirements that a building must satisfy. The NCC does not tell a designer which louvre to use; it establishes the outcomes, and the standards and referenced documents describe how compliance with those outcomes is demonstrated. A louvre screen or louvre window is therefore assessed twice: once as a building element affecting weatherproofing, structural safety, fire performance where relevant, and energy performance, and once as a product whose claimed performance has to be evidenced.

The Australian standards in play

AS 2047 covers windows and doors for buildings and is the standard against which window products are typically rated and certified. AS 4284 defines the performance of windows, covering the characteristics against which a window is tested, including air infiltration, water penetration and wind load resistance, and it is the standard under which a tested result becomes a comparable figure. AS 4666 governs the installation of windows and doors, and it matters because a product’s rated performance is only realised if the unit is installed as tested, with the correct fixing, sealing and clearance. AS 1288 governs glass in buildings and sets out how glazing must be selected and installed for the location, size and support conditions, with the safety glazing requirements for particular applications sitting alongside it.

The application of each standard to a given louvre arrangement should be confirmed rather than assumed. AS 2047 and AS 4284 are written around windows and doors, so a louvre window is the closer fit and a fixed external screen is generally not a window at all. A screen is instead assessed as a façade element: structural adequacy of blades, frame and brackets, fixing capacity, corrosion resistance of the finish system, and the effect of the screen on the performance of the element behind it. Getting this classification wrong at the outset leads either to a screen being asked for certification it cannot have, or to a louvre window being installed with no test evidence at all.

New Zealand

New Zealand projects work within the New Zealand building code framework, with verification methods and acceptable solutions that reference the applicable product standards. For window and door products the relevant referenced documents include SNZ TS 4211:2022 and SNZ 4223, which are used alongside the New Zealand building code context in the same way that AS 2047 and its companion standards are used in Australia. A product certified for the Australian market is not automatically compliant in New Zealand, and vice versa; the two frameworks have different referenced documents, different climate and exposure assumptions and different documentation expectations. Suppliers who work in both markets maintain evidence for both.

The documentation set

A project should be able to assemble a file containing: the louvre schedule with product series, blade profile, frame, finish and span; the bracket and fixing design with the substrate assumed; the interface details at head, jambs and sill; the finish specification and the fastener specification; the glazing specification where glass is involved; the test reports or engineering assessments supporting each performance claim, matched to the exact configuration; the installation method statement; and the maintenance instructions. Meichen’s own position in this framework is documented rather than asserted: 43 product series certified against the Australian standards set covering AS 2047, AS 4284, AS 1288, AS 4666 and AS 2208, 13 certified product lines in New Zealand, and CodeMark certification actively being pursued as the highest level of product certification in Australia, supported by verification partners including BV, CSI, NATA, AZUMA and INTERTEK. The company has been dedicated to the Australian and New Zealand market since 2017, bringing 18 to 19 years of industry experience, and manufactures in a 20,000 square metre facility in Zhaoqing, Guangdong, with local partnerships in Sydney and a supply chain that includes AAG for aluminium, CSG for glass and ANZ-specialised hardware suppliers.

Maintenance

A louvre is a moving or at least an exposed assembly, and it needs a maintenance regime that is written for it rather than inherited from the window schedule. The regime should be proportionate to the exposure: a sheltered suburban screen and a coastal screen on an exposed elevation do not need the same frequency.

Routine attention

Routine attention covers what an occupant or a cleaner can reasonably do. Washing the blades removes salt, dust and pollen and allows the coating to shed water. Clearing debris from the base of the screen and from any drainage path prevents water sitting against the frame. Checking that blade ends are open and that no cap or sealant has been added since handover keeps the shedding behaviour intact. For a louvre window, routine attention includes operating the blades through their full range, checking that they close evenly against the gaskets and that the operator moves without excessive force.

Scheduled inspection

Scheduled inspection covers what needs a technician. Fixings should be checked for tightness and for corrosion, particularly where brackets meet the substrate and wherever dissimilar metals are in contact. Gaskets should be checked for compression set, hardening and tearing, because a gasket that has lost its memory no longer seals regardless of how tight the blade closes. Sealant joints should be inspected for adhesion loss and cracking, and replaced rather than patched. Coatings should be inspected at cut edges, at fixing points and on upward-facing surfaces, which are the places where failure begins. After any significant wind event, the blade alignment and the bracket connections should be checked before the screen is returned to normal service.

What maintenance cannot fix

Maintenance cannot correct a design that has no drainage path, a bracket fixed to a substrate that cannot carry the load, a screen mounted so close to the wall that neither surface can be cleaned, or a blade set that discharges water directly onto the head of the window below. Those are design and installation defects, and the remedy is modification, not more frequent cleaning. Recognising the difference early saves years of repeated call-backs.

Specification Checklist

Classify the element. State whether each louvre is a fixed screen, an operable louvre window, or part of a combined assembly, and apply the appropriate performance regime.
Rank the objectives. Record which of solar control, privacy and ventilation dominates on each elevation, and accept the trade-off in writing.
Derive the geometry. Base blade orientation and spacing on a sun path study and a wind assessment for the actual latitude, elevation and site exposure.
Verify the substrate. Confirm the material, thickness and capacity at every bracket location before the fixing design is finalised.
Design the bracket. Specify a bracket with a defined standoff and adjustment range, sized for wind load on the screen and for the lever arm it creates.
Detail the drainage. Show blade end openings, the discharge line, the clear gap at the base and the separation from the wall, and keep the screen’s discharge away from the opening below.
Specify the finish system. Name the coating or anodising, the pre-treatment, the fastener material and the isolation details, and match all of them to the exposure category.
Coordinate the glazing. Confirm glass selection, safety glazing requirements and blade glazing details, and allow access for cleaning between screen and glass.
Require evidence. Ask for test reports or engineering assessments for the exact configuration, not for a similar product, and reject undefined marketing terms.
Plan the maintenance. Issue instructions covering cleaning frequency, access method, gasket and sealant inspection, and fixing checks.

Frequently Asked Questions

Is a louvre screen the same as a louvre window?

No. A screen is a secondary skin mounted outside a complete building envelope, and the wall and window behind it remain responsible for weathertightness. A louvre window is the envelope itself: the blades close against gaskets in a window frame, and the unit is expected to resist air infiltration, water penetration and wind load as a window. The two are specified, tested and installed under different assumptions, even though they look similar from the street.

Can a louvre provide privacy and ventilation at the same time?

Yes, but only within a defined viewing angle and a reduced open area, and the balance has to be designed rather than assumed. Blade angle and overlap that block a sight line from a neighbour also reduce airflow and daylight. The workable approach is to draw the sight lines from the actual observer positions and to accept that the result is a compromise, ideally one that can be adjusted if the overlooking condition changes.

Will a louvre screen stop rain reaching the window behind it?

It will reduce the rain that reaches the window, particularly where the rain is wind-driven from a consistent direction, but it should not be relied on as a weather seal. The window behind the screen must be independently weathertight and drained, and the screen must be detailed so that the water it sheds does not discharge onto the window head or collect against the wall.

What fixing problem causes most louvre failures?

Fixing into a substrate that was assumed rather than verified, and brackets that were selected on site rather than designed. A screen presents a large area to the wind and the bracket creates a lever arm, so the load at the fixing is greater than the blade weight suggests. Cavities of unknown depth, thin cladding panels and aged masonry are the usual weak points.

Which standards apply to a louvre installation?

It depends on the classification. AS 2047, AS 4284 and AS 4666 are written around windows and doors, so they apply most directly to louvre windows and to the windows behind a screen, with AS 1288 governing the glass. A fixed screen is generally assessed as a façade element for structural adequacy, fixing capacity, corrosion resistance and its effect on the element behind. The National Construction Code, issued under the authority of the Australian Building Code Board, sets the overarching performance requirements, and New Zealand projects work to the New Zealand building code framework with referenced documents including SNZ TS 4211:2022 and SNZ 4223.

How often should louvres be cleaned?

There is no single correct interval, because it depends on exposure, orientation, nearby sources of contamination and the finish. What matters is that the interval is set for the site, that the access method makes cleaning actually possible, and that the regime includes inspection of gaskets, sealants, fixings and coating edges rather than washing alone. Coastal and exposed sites will need more frequent attention than sheltered inland ones.

Can I add a screen later to fix an overheating or privacy problem?

Often yes, and it is a common retrofit. The constraints are the substrate available for brackets, the space between the wall and the boundary or the glazing, the need to keep the window cleanable, and the effect of the screen on daylight. A retrofit designed with those four constraints in mind usually performs better than one installed to solve a single complaint.

Conclusion

Louvres fail in practice for reasons that have almost nothing to do with the blades. They fail because the brief never ranked sun control against privacy against ventilation, because the blade angle was chosen from a photograph rather than a sun path, because the brackets were fixed to a substrate nobody verified, because the water that passed the blades had nowhere designed to go, or because the finish system was never matched to a coastal exposure. Each of those is a decision, and each can be made correctly at the drawing stage for very little cost.

The discipline that ties the decisions together is coordination. A louvre screen only makes sense in relation to the glazing behind it, the wall it is fixed to, the room it serves and the neighbour it screens. A louvre window only makes sense in relation to the standards under which its performance is claimed and the installation that determines whether that performance survives. The compliance framework, from the National Construction Code through AS 2047, AS 4284, AS 4666 and AS 1288 in Australia, and the New Zealand building code with SNZ TS 4211:2022 and SNZ 4223, exists to make those relationships explicit and testable.

Meichen approaches louvres as part of a coordinated aluminium system rather than as an isolated product, alongside curtain walls, balustrades and window and door ranges, supported by 43 certified product series in Australia, 13 certified product lines in New Zealand and a documented supply chain. For project teams, the practical conclusion is simpler than the product range: define what the louvre has to achieve, verify the substrate and the fixing, draw the water path, name the finish, require evidence for every performance claim, and write a maintenance regime that someone can actually follow. Do that, and the louvre does the job it was chosen for.