Wall Panel Installation Services VIC 2026 - Get Quotes

How a Panel Wall Differs From a Board Wall

The fundamental difference is that boards overlap and panels do not. On a weatherboard wall every course laps the one below, so water running down the face is shed outward by the geometry of the profile regardless of how carefully the carpenter worked. A panel wall has straight vertical and horizontal lines where two sheet edges meet, and at every one of those lines the only thing between the weather and the frame is the joint detail. That single fact explains why panel installation is a more exacting trade than board fixing, and why the difference between a good installer and a poor one shows up much faster. The cladding services guide for Victoria puts panel systems alongside the other wall types used across the state.

Panels also demand far more of the substrate. A slightly bowed stud is invisible behind a 150 millimetre board and obvious behind a 2.4 metre sheet, because a large flat plane shows every deviation as a shadow or a ripple across the face. Older Victorian frames are rarely dead flat, so packing, planing or battening the frame into true is routinely part of the job and not an optional extra. An installer who inspects the frame with a string line before quoting has understood the work. One who quotes from the wall area alone has not. It is a quick check to make and it tells you whether the installer is thinking about the finished appearance or only about coverage.

The products themselves cover a wide range and each behaves differently. Flat fibre cement sheet is the economical workhorse and takes paint well, express joint systems build the joint into the design with a formed recess and a jointer, grooved and scored panels give a board look from a sheet, compressed fibre cement is dense and strong for exposed or trafficked locations, autoclaved aerated concrete panel behaves like lightweight masonry, and metal and composite panels give factory finished flat planes. What they share is the joint problem, not any material property. Choosing between them is largely about appearance, fire requirements and budget, since the installation discipline is common to all of them. The sheet is rarely what decides whether the wall lasts.

Movement is the other thing that separates panel from board. Sheets expand and contract across their width and length with temperature and moisture, and Victoria asks a lot of that in districts such as Ballarat, Daylesford and the Macedon Ranges where hard frosts and hot February afternoons occur in the same year. Panels therefore need gaps at every joint, control joints at intervals set by the manufacturer, and fixings placed so the sheet can move without splitting around the fastener. A wall fixed tight will crack at the corners of openings first, which is the classic sign. Those cracks are not cosmetic, because they open a direct path for water into the frame behind. Where panel is being compared against boards for the same wall, the honest comparison includes the whole build up.

Panel is generally faster to install over large uninterrupted areas and slower around many openings, because each opening multiplies the flashing and trim work. A gable with no windows suits a panel system very well, while a wall with four windows and a door may cost more in panel than in boards. The exterior wall cladding page covers how the systems compare across a complete wall. Counting the openings on each elevation before asking for prices gives a realistic sense of where the labour will sit. It also explains why two walls of the same area can be quoted thousands apart.

Setout and Module Planning

Setout is the drawing exercise that happens before anything is ordered, and it is where a panel wall is either designed or left to chance. Sheets come in fixed sizes, commonly 1200 or 900 millimetres wide and from 2400 up to 3000 millimetres long, and the wall has to be divided into those modules so that every vertical joint lands on a stud and the pattern reads deliberately across the elevation. Doing that properly may mean adjusting stud centres in new work, or adding studs and nogging in existing framing so that every sheet edge has something solid to land on. Older Victorian houses rarely have stud spacings that suit a modern sheet module, so this comes up on most older houses. Adding noggins or a batten grid to suit the sheet is ordinary work and should appear on the quote.

It is an hour at the drawing stage that determines how the wall looks for its whole life. Joints should relate to the openings instead of ignoring them. A vertical joint that runs into the corner of a window is both visually awkward and a crack waiting to happen, because openings concentrate movement at their corners. Good practice is to align joints with the edges of windows and doors where possible, or to keep them clearly away, and to avoid small slivers of panel at the end of a run. If an elevation cannot be divided neatly, the leftover goes somewhere inconspicuous and never beside the front door. A rear corner or a wall behind a garden bed absorbs an awkward module far better than the entry elevation does.

Deciding where that offcut goes belongs in the setout, not on the day. On express joint systems the setout becomes the architecture. The recessed joint lines are a visible design feature, so their spacing, their alignment from one elevation to the next and their relationship to windows, eaves and the base of the wall all show. A wall where the joint lines on the front do not continue around the corner looks unresolved even to someone who could not say why. Setting those lines out on a drawing and marking them on the frame before fixing anything is the only way to get it right.

The marking takes an afternoon and the mistake, once the sheets are up, takes a week to undo. Horizontal joints need their own thought and they are where most panel walls leak. Where a wall is taller than one sheet, the horizontal join has to be flashed with a purpose made z-flashing or the manufacturer's jointing accessory, with the upper sheet lapping over the flashing and a gap left so water can escape. Sealing a horizontal joint with nothing but a bead of sealant is the most common serious mistake on panel walls in Victoria. It looks fine for two years and then stains appear below the line. By the time the staining is visible on the outside, the frame behind that joint has usually been damp through several winters.

A written setout and detail plan costs $280 to $750 on a typical house and is money well spent on anything beyond a simple gable. It should show the panel layout for each elevation, the joint type at every condition, the flashing details at window heads, sills, the base of the wall and material junctions, and the control joint positions. That document is also what lets three quotes be compared properly, because everyone is pricing the same wall instead of their own assumptions about it. On a house with several elevations and a mix of materials it is close to essential, since the junctions between systems are exactly where improvisation causes trouble.

Joint Systems and Movement

There are four common ways to handle a vertical joint and each is a legitimate system when executed properly. An expressed joint leaves a deliberate gap, backed by a flashing or a proprietary jointer, and celebrates the line as a design feature. A sealed butt joint brings sheets close with a backing rod and a flexible sealant over a flashing behind. A battened joint covers the gap with a timber or metal batten, which is the traditional board and batten approach applied to sheet. A flashed joint uses a formed metal section that the sheets engage into.

Which one suits depends on the look wanted, the panel product and how much movement the wall will see, and mixing approaches on one elevation rarely looks deliberate. The important point is that the sealant is never the waterproofing on its own. In every properly built system there is a flashing or a drainage path behind the joint, and the sealant is a secondary line that keeps most of the water out and will eventually need replacing. Sealants have a service life measured in perhaps ten to fifteen years in Victorian conditions, less on north and west elevations, and a wall that depends entirely on sealant has a defined expiry date. Find out what sits behind every sealed joint, because that answer separates a wall that lasts from one that starts leaking in its second decade. Backing rods matter more than their cost suggests.

A sealant bead needs the correct depth to width ratio to flex properly, and it must adhere to the two sheet edges and not to the back of the joint, which is exactly what a closed cell backing rod achieves. Sealant packed hard into a joint without a rod bonds on three sides, cannot stretch, and tears away from one edge the first time the wall moves. This is an invisible detail that predicts whether a joint survives its first few summers. The materials cost very little and the only variable is whether the installer follows the method. Control joints are the larger scale version of the same problem.

Manufacturers specify maximum distances between control joints for their panels, and long uninterrupted runs of wall need them at those intervals whether or not they are visually welcome. They are also needed where the structure changes, such as at a junction between an original house and an addition, because the two parts will move independently. A wall built without them cracks where the designer did not choose, instead of moving where the designer did. Owners often resist control joints on appearance grounds, which is understandable, but a crack in the wrong place looks considerably worse than a joint in the right one.

Sealant choice and workmanship deserve attention too. Exterior joints need a high movement capability sealant appropriate to the substrate, applied to clean dry edges within the temperature range on the tube, and tooled properly so it wets both faces. Painting over sealant is common on fibre cement walls and the paint has to be compatible or it will crack along the bead. Products from Sika, Bostik and Selleys are widely used on Victorian sites, and the manufacturer's own recommendation for the panel should take precedence over habit. Recording which sealant was used, and when, makes the eventual replacement a much simpler conversation.

Substrate, Cavity and Membrane

Behind the panels sits the part of the wall that actually keeps the building dry. In Victoria that begins with a vapour permeable pliable membrane complying with AS/NZS 4200.1 and installed to AS/NZS 4200.2, in place of the impermeable sarking used on older houses. The condensation management provisions in the National Construction Code drive this, and Victoria sits in climate zones 6, 7 and 8, the cold end of the national map. Running heaters through the colder half of the year drives damp indoor air into the wall, and a membrane that lets the vapour keep moving outward is what stops it turning to water against the frame. A drained and ventilated cavity is the strongest single upgrade on a panel wall and it is close to standard practice on good Victorian work now. Battens hold the panels off the frame, creating an air gap open at the bottom and vented at the top, so any water that gets past a joint runs down the back of the panel and out instead of soaking into the frame.

It also lets the back of the panel dry. Battens add roughly 20 millimetres to the wall thickness and $18 to $45 a square metre, and they change every reveal and trim dimension, so they belong on the drawing and not on site. Insulation should be settled in the same conversation because the frame will not be this open again. Expect R2.0 to R2.7 batts in a 90 millimetre stud at $18 to $45 a square metre, with rough sawn hardwood framing and 70 millimetre studs narrowing the options. In a Melbourne, Ballarat or Bendigo winter the comfort difference is immediate and the heating load drops every year afterwards.

The wall and ceiling insulation page covers products and installation practice. Flashings at openings are where the whole assembly is tested, and there are only a handful of conditions to get right. Window and door heads need a head flashing that laps over the panel or trim below and turns up behind the membrane, sills need to drain outward with stop ends, the base of the wall needs a flashing and a clear drainage path with adequate ground clearance, and every junction with another material needs a flashing, never a bead of sealant. Many older Victorian windows went in without a head flashing of any kind, and an overclad or a reclad is the natural point to put that right. Doing it later means opening the wall again for a component worth a few dollars.

Tired frames are best dealt with in the same visit through window repairs, because returning later means disturbing new panels. Bracing is a quieter question that deserves asking on any job where sheet is being removed. On many framed houses the original sheet cladding or internal bracing contributes to the wall's resistance to racking, and AS 1684 sets the bracing requirements for timber framed houses. Removing sheet can remove part of that capacity, so bracing ply or strap bracing may be needed before new panels go on. Where the frame's condition is uncertain, a structural inspection gives a definite answer instead of an opinion. It is a small cost against the risk of discovering a bracing shortfall after the panels are on.

Wind classification drives the fixing specification and it varies widely across Victoria. AS 4055 sets the classifications used for housing, and an exposed ridge in the Macedon Ranges, an open site in the Wimmera or a Surf Coast block attracts a higher classification than a sheltered suburban lot. That classification determines fastener type, spacing and sometimes panel thickness. An installer quoting a standard fixing pattern without asking about site exposure has not engineered the wall for where it is going. On an exposed site that is a question worth pressing before signing anything.

Fixing and How the Job Runs

Fastener selection follows the panel and the exposure. Fibre cement panels take purpose made screws or nails with the head finished flush or slightly below the surface, never driven so hard that they crush the sheet, and hot dip galvanised is the general minimum inland with stainless steel required within the salt affected strip running along the bay, the Bellarine, the Surf Coast and into Gippsland. Edge distances matter because a fastener too close to a sheet edge will break it out, and manufacturers publish minimum distances for edges and corners. These are ordinary rules that a specialist installer follows automatically. A general carpenter who fixes sheet occasionally may not know them, which is why the trade matters on this kind of work. Cutting is a health question as much as a workmanship one.

Fibre cement contains crystalline silica and cutting it dry with an angle grinder releases respirable dust that Victorian occupational health and safety law requires to be controlled. The correct methods are score and snap, shears, or a saw fitted with dust extraction, along with wet cutting where appropriate and respiratory protection. WorkSafe Victoria administers those duties. An installer dry grinding sheets in a driveway without extraction is both breaking the rules and leaving dust across the property. Shears and a score and snap knife handle most cuts with no dust at all.

The order of work on a panel job is predictable and easy to check against a quote. Access is set up, existing cladding is removed where relevant, the frame is inspected, repaired and brought into true, bracing is dealt with, the membrane is installed and every opening flashed, battens follow if a cavity is specified, panels are set out and fixed working to the drawing, joints are formed, sealants and jointers are installed, trims and flashings are completed and the coating goes on last. Licensed trades take the services off before the strip out and put them back once the panels are fixed. Access is a significant cost and it is quoted for the building instead of by rate. Scaffold costs $900 to $4,500 for the elevation and the hire period, and it is required on anything above a single storey as well as on plenty of single storey houses with tall gables or a fall across the block.

Working at height is regulated by WorkSafe Victoria. Panels are large, heavy and awkward, so handling on scaffold takes more people than boards do, which is part of why upper level work costs more per square metre than ground floor work on the same house. Winter weather sets the pace of the job. Open only as much wall in a day as can be sealed up before dark, because a bare frame caught by a southwesterly change will soak the insulation and linings behind it. Sealants also have minimum application temperatures and will not cure properly on a cold Ballarat morning, and coatings have their own limits. A program that acknowledges all of that has been written by someone who works here.

Many owners prefer to schedule panel work for spring through early autumn where the timing allows, although a well managed winter job is perfectly achievable. Waste is bulkier on panel jobs than owners expect, since offcuts cannot be nested efficiently and broken sheets happen. Skip bin hire and a council permit where the skip stands on the road should be organised before the start. When the existing wall is being removed, the strip out fills the skip quickly, and asbestos waste, where it exists, is handled entirely separately by the licensed removalist and never goes into a general skip.

Coating is the last stage and on fibre cement it is doing real work. A quality exterior acrylic system over a suitable sealer is the standard approach, and products such as Dulux Weathershield, Wattyl Solagard and Dulux Acratex texture systems are widely used across Victoria. Very dark colours on large panels raise surface temperature and increase movement, which asks more of every joint, so checking that a colour is approved for the substrate is worth doing before committing. The exterior painting page covers systems and preparation.

Overcladding an Existing Wall

Overcladding means fixing new panels over the existing wall instead of stripping it, and on the right building it is a sensible saving. It avoids the strip out labour, the waste disposal and the risk of exposing the frame to weather, and it can be quicker by a week or more. Where it works well is over a sound framed wall with a functioning membrane, where the existing surface is reasonably flat and where the extra thickness can be accommodated at the openings. Where it does not work is more important to understand, because the savings disappear quickly once a hidden problem surfaces.

The first question on any pre-1990 wall is asbestos. Sheeting, eaves linings and gable infills are all suspect on an older building, and no one can tell by looking. A few hundred dollars spent on asbestos testing and inspection settles the question properly. Panelling straight over asbestos sheet hands the problem to the next owner and to anyone who later needs to fix something to that wall, and an inspection before sale will pick it up. Where removal is needed, the obligations under the Occupational Health and Safety Regulations 2017 require a licensed removalist and disposal to a facility licensed by the Environment Protection Authority Victoria, which the asbestos removal page covers. The second question is where the waterproof line sits in the new arrangement.

Adding a second skin creates a cavity between the old wall and the new panels, and that cavity has to drain and dry instead of trapping moisture. If the old wall has no membrane, or has an impermeable sarking, the new build up can seal moisture into the wall in a heating climate. The honest answer is often to install a new membrane over the existing cladding on battens, which is why an overclad on an older Victorian house frequently ends up costing more than the headline saving suggested. The third question is dimensional and it catches people out. Moving the face of the wall outward by 30 to 60 millimetres changes every window and door reveal, every sill, the relationship with the eaves and fascia, the position of meter boxes, taps, lights and air conditioner brackets, and sometimes the roof edge.

All of that has to be drawn before anything is ordered, because window reveals that were not allowed for turn a tidy job into an awkward one. Get a drawn section through the proposed wall at a window, since a verbal assurance shows nothing. A single drawing at that one condition usually reveals whether the whole overclad has been thought through. If the existing wall is not flat, battens solve the problem and add cost.

Older Victorian frames, particularly on houses that have moved on their stumps, are commonly out of true by enough to show across a large sheet. Battens packed to a string line bring the plane back and provide the drained cavity at the same time, which makes them two jobs for one price. Where movement in the house is ongoing instead of historic, restumping or reblocking belongs before the cladding, since relevelling a house afterwards will crack new panels. Whether to overclad or strip is ultimately a judgement about what is hidden.

Stripping costs more and takes longer but exposes the frame, the bottom plates, the window flashings and the insulation, all of which are cheap to fix while open and expensive later. Overcladding is faster and cheaper but accepts whatever is behind. On a house with any history of leaks, soft boards or unexplained damp, stripping is the safer decision, and the full sequence is covered on the house recladding page. Overcladding a wall that was already wet simply hides the problem for a few more years. The saving disappears the moment the frame has to be opened up again.

Permits, Fire and Overlays

Victorian domestic building work priced over $10,000 needs a major domestic building contract and a registered builder behind it. Registration sits with the Building and Plumbing Commission, which replaced the Victorian Building Authority in that role in July 2025. Most panel installation on a house passes that threshold. On work above $16,000 the builder carries domestic building insurance and hands over the certificate before any money changes hands. Deposits are limited to 5% below $20,000 and 10% from $20,000 up. Checking the public register takes a minute and confirms both registration and class.

A registered building surveyor decides whether a permit is required, working from the Building Act 1993 and the Building Regulations 2018 as published on the Victorian Legislation site. A change of cladding material, structural work, work in a bushfire prone area and work affecting fire separation commonly require one, and a like for like replacement often does not. Where a permit is needed it must be issued before work starts and the surveyor carries out mandatory inspections. Fees typically run $1,200 to $3,500 and the final certificate is a document worth having at resale.

Fire requirements apply to more houses than owners expect. A wall close enough to a boundary to fall inside the setback distances set by the National Construction Code, or a wall separating two dwellings, can be required to reach a fire resistance level, and only a tested system will satisfy that, never a panel on its own. This comes up constantly on townhouses, dual occupancies and garages near boundaries, which the garage wall cladding page covers. Where a rating is required, the evidence is a test report or assessment for the system as built, and the building surveyor signs off on it. Bushfire attack level governs material choice across a large part of Victoria.

Designated bushfire prone areas cover the hills east of Melbourne, the ranges to the north and west, the forested southwest and a broad band of the urban fringe, with construction assessed under AS 3959 on a scale from BAL-LOW through to BAL-FZ. The Country Fire Authority explains what each rating requires. Fibre cement and AAC panels meet the higher ratings comfortably, while combustible cored products become restricted. The standard also controls gaps above three millimetres, so joint detailing and base of wall sealing form part of the assessment. Planning overlays are separate again and they matter for appearance instead of performance. Heritage and neighbourhood character overlays across the inner suburbs, Ballarat, Bendigo, Castlemaine, Geelong and many country towns control the material and profile of street facing elevations, and a flat modern panel on a controlled elevation will usually need a planning permit.

Check the address against the free VicPlan report published by Planning Victoria site, then ask the council planning counter what the result means before settling on a product. The usual consumer protections apply here too. Materials and workmanship are guaranteed under the Australian Consumer Law, building consumer guidance comes from Consumer Affairs Victoria, and the Domestic Building Contracts Act 1995 writes warranties into every domestic building contract. A dispute goes to the builder in writing to begin with, then to Domestic Building Dispute Resolution Victoria, which conciliates and can make binding orders, and finally to the Victorian Civil and Administrative Tribunal if it is still unresolved. Photographs of the membrane, flashings and battens taken before the panels went on are the most useful evidence available in a cladding dispute, since there is no way to inspect behind a finished panel wall without removing part of it.

Costs in Detail

A measure, setout and detail plan runs $280 to $750 and earns its cost on anything beyond a single simple elevation. It establishes the panel layout, the joint type at every condition and the flashing details, which is what lets three quotes be compared on equal terms. Without it, each installer prices their own assumptions about the joints and the spread between quotes becomes meaningless. On a complex elevation it also prevents an expensive ordering mistake, since sheets ordered to the wrong module cannot usually be returned once they have been cut. Flat fibre cement sheet supplied and installed runs $85 to $170 a square metre, express joint panel systems $120 to $230, and compressed fibre cement $150 to $290 given the weight and handling involved. AAC panel installed and rendered typically runs $140 to $235, and metal or composite panel systems $160 to $340.

Overcladding an existing wall generally runs $110 to $210 a square metre, which sits above the equivalent new work rate because of battening and the detailing at reveals. Painting adds $35 to $75 a square metre on unpainted fibre cement. The wall behind the panels carries its own rates. A vapour permeable membrane adds $9 to $22 a square metre, a cavity batten system $18 to $45, and wall insulation $18 to $45 while the frame is open.

Reflashing existing windows into a new membrane runs $180 to $650 per opening, and framing repairs are charged at $65 to $180 a lineal metre, and that rate should appear in the quote instead of being left to the invoice. Bracing work is priced similarly to framing repairs where it is needed, and it is worth asking whether the quote has allowed for any at all on an older framed house. Maintenance and rectification have their own figures. Replacing failed joint sealant runs $22 to $48 a lineal metre including preparation and, where required, painting the bead. Rectifying a poorly detailed horizontal joint, which usually means removing panels to install the flashing that should have been there, is considerably more and is priced per job. How a damaged panel is repaired depends entirely on the product, and the cladding repairs page sets out the methods by wall type.

Keeping a couple of spare sheets from the original order makes a future repair far easier to match. Access and compliance sit on top of all of it and are independent of the panel choice. Access sits at $900 to $4,500, a surveyor charges $1,200 to $3,500 where a permit applies, council fees attach to planning permits in overlay areas and the approval pushes the start date back by weeks, engineering for an unusual detail or a high wind classification adds several hundred to a few thousand, and services on the wall are dealt with by licensed electrical and gas trades, priced by them directly. Measure the elevations and deduct the openings and most single storey houses land between 130 and 200 square metres of wall, which is the number that converts every rate above into a total.

Regional pricing follows its own pattern and it runs both ways. Melbourne based crews working in Gippsland, the Wimmera, the northeast or the Mallee charge for the travel and sometimes for a night away, whereas trades already established in Ballarat, Bendigo, Geelong or Shepparton tend to be keener on price and slower to become available. Large sheets travel badly, so freight to remote sites costs more and the occasional cracked panel has to be replaced. Asking each quote to state how travel, delivery and breakage have been allowed for makes regional comparisons clearer.

What to Look Out For

Be cautious of any quote that does not describe the joints. A price per square metre with no mention of whether joints are expressed, sealed, battened or flashed, and no mention of what sits behind them, is a price for sheets, not for a wall. Get specific answers on what happens at a vertical joint, a horizontal joint, a window head and the base of the wall. An installer who answers those four questions confidently is the one to shortlist. The answers should follow the manufacturer's published details, not a personal preference. Watch for horizontal joints sealed with nothing but a bead of sealant.

This is the most common serious defect on Victorian panel walls and it is invisible for the first couple of years, after which stains appear on the wall below the line and the frame behind begins to suffer. A horizontal joint needs a flashing with the upper sheet lapping over it and a drainage gap. Sealant alone in that position is not a system, it is a countdown. Be careful about substrate flatness on an older house. A large sheet shows every bow in the frame, and a quote that does not mention checking the frame with a string line, packing or battening has not allowed for the work that will be needed.

Discovering it once the first sheet is up leads to either a variation or a wall that reads wavy from the street. Establish how the plane will be made true before panels are ordered. A string line across the studs takes ten minutes and settles the question one way or the other. Look at how the cutting is being done. Dry grinding fibre cement without dust extraction releases respirable crystalline silica, which is both a legal issue and a practical one, since the dust settles across the property. Scoring and snapping, shears, or a saw running dust extraction are the accepted approaches, always with respiratory protection.

How an installer responds to that question is a reliable indicator of how the rest of the job will be run. It is also worth asking where the cutting station will be set up, since a position downwind of open windows or a neighbour's washing line is worth moving. Finally, check the base of the wall and the fixings. Panels should finish clear of soil, paving and garden beds with a drainage path and, on a timber framed house, a visible termite inspection zone, which AS 3660 addresses and which a termite inspection relies on.

Fasteners should be the right metal for the exposure, set flush and not crushed into the sheet, and kept the specified distance from edges. These are small items that cost nothing at installation and a great deal to correct later. They are also the first things a careful building inspector looks at on a pre-purchase report, so getting them right protects the sale as much as the wall. Photographs of the flashings taken before the panels went on are worth keeping with the house papers.

How to Get Comparable Quotes

Start with the setout and detail plan if the job is anything more than one simple elevation. Handing every installer the same drawing showing panel layout, joint types and flashing details means three quotes for the same wall, which is the only way the numbers mean anything. Without it, you are comparing one installer's careful detailing against another's assumption that sealant will do. That is not a price comparison, it is a specification gap dressed up as one. The plan costs a few hundred dollars and routinely saves multiples of that. It also gives you something concrete to hold the installer to once the work starts.

Then put the same written questions to everyone. Registration and insurance, the panel product and thickness, the joint system at each condition, the flashings at window heads, sills, base of wall and material junctions, the membrane product, batten or direct fix, insulation, the wind classification used and the resulting fixing pattern, bracing, substrate preparation, silica dust controls, the coating system, access, waste, framing contingency rate, permits, program and warranty. Identical questions are what let you read the gap between two prices as a difference in work instead of wording. Compare methods before totals. A quote that comes in cheaper by roughly the value of the battens, the membrane and proper horizontal joint flashings has priced a lesser wall, not struck a better deal.

Price those items back in and the two numbers usually meet. Where it does not, ask the lower priced installer to explain the difference in writing. Sometimes the answer is a genuine efficiency in their supply or their crew, and sometimes it is an omission, and a written answer makes clear which one you are dealing with. Keep the complete record once the job is finished. Note the panel product and thickness, the joint system and jointers used, the sealant brand and type with its expected service life, the membrane product, the insulation R-value, the coating system and colour codes, the permit and final certificate, and photographs of the membrane, battens and flashings taken before the panels went on. An inspector at sale time can be satisfied from those photographs without a panel coming off, and the sealant record tells a future owner when the joints will next need attention.

Owners who keep that file find every subsequent quote on the house easier to obtain. A panel wall detailed properly is a clean, durable and low maintenance wall that suits contemporary Victorian housing very well. What decides that outcome is not the panel but the setout, the joints, the flashings and the cavity behind, all of which are settled before the first sheet is lifted. Spending the time and a few hundred dollars on that stage is the difference between a wall that is still crisp in its twentieth year and one that is being investigated for leaks in its fifth. None of it is complicated work, but all of it has to be decided before the panels arrive instead of worked out as the job goes along.