By Rachael Ayling and Kathryn Campbell
If you own a monolithic-clad home, you probably already know how quickly people can make assumptions about it.
Mention “monolithic cladding” and many people immediately think “leaky home”. However, monolithic describes an exterior cladding style or system. It is not, by itself, a diagnosis of a weathertightness problem.
Homes with monolithic cladding can vary considerably in their construction, design, age and condition. The exact cladding system, whether it has a cavity, the design and construction of the home, its maintenance history and its current condition are all relevant when assessing an individual property.
For owners and buyers, the important thing is not to make assumptions either way, but to understand exactly what you are dealing with and obtain appropriate specialist advice where needed.
Not All Plaster-Looking Homes Are the Same
Two homes can look very similar from the street but have quite different construction underneath.
A plaster-style exterior may involve fibre-cement sheet, polystyrene-based systems, solid plaster, or plaster over brick or masonry. Depending on the age and construction of the home, the cladding may also be direct-fixed or installed over a cavity.
It is not always possible to reliably identify the complete system simply by looking at the exterior. Council property files, approved building plans, consent documentation and product information may provide useful information, but where there is uncertainty, advice should be obtained from an appropriately qualified building professional.
Why Does a Cavity Matter?
One important consideration with some cladding systems is whether the cladding is direct-fixed or installed over a drained and ventilated cavity.
In general terms, a cavity provides separation between the exterior cladding and the building structure and is designed to assist with drainage and drying if moisture gets behind the exterior cladding.
Older direct-fixed construction does not have this same cavity arrangement, which is one of the reasons these homes can attract greater scrutiny from buyers, building inspectors, insurers and lenders.
However, neither construction method tells the whole story. Direct-fixed cladding does not automatically mean a home has leaked, while the presence of a cavity does not guarantee that a property is free from weathertightness issues.
The overall design, construction, exposure, maintenance and present condition of the individual property all matter.
What Other Factors Can Affect Risk?
Whether a home has a cavity is only one part of the picture. The overall design and construction of the building can also influence its weathertightness risk.
Features such as limited or no eaves, complex roof shapes and junctions, enclosed decks or balconies, parapets, penetrations through the cladding and the way windows and doors have been detailed can all increase the number of areas where careful design, construction and ongoing maintenance are important.
The home’s exposure to wind and rain can also make a difference. A highly exposed property may place greater demands on the exterior envelope than a more sheltered home.
These types of factors are reflected in MBIE’s E2/AS1 weathertightness risk framework, which considers matters including wind zone, number of storeys, roof/wall intersections, eaves, building-envelope complexity and deck design.*
Importantly, the presence of one or more of these features does not mean a house has leaked, just as the absence of them does not establish that it is problem-free. They are factors that a suitably qualified professional may consider when assessing the overall weathertightness risk of an individual property.
Why Does the Age of the Home Matter?
The Real Estate Authority notes that buildings with a higher risk of leaking were mostly built between the late 1980s and the mid-2000s, particularly those using plaster-style monolithic cladding systems.**
However, the age of a home is only one indicator of potential risk. Not every home built during this period has weathertightness problems, and a building date alone cannot establish whether a particular property is sound.
Changes to building requirements during the 2000s resulted in greater use of drained and ventilated cavities and other measures intended to improve weathertightness. This means establishing when a home was built, what cladding system was used and how it was constructed can be an important part of understanding the individual property.
Age should therefore be considered alongside the home’s design, construction, exposure, maintenance history and present condition, rather than in isolation.
Maintenance Matters
Like all homes, properties with monolithic cladding require ongoing maintenance.
Owners should be alert to deterioration such as cracking, failed sealants, damaged coatings and issues around windows, doors and other penetrations. Maintenance and repainting requirements can vary between cladding systems, so the manufacturer’s recommendations should be followed where these are available.
Some monolithic cladding systems require flexible or elastomeric coatings, which are designed to accommodate a degree of movement and help maintain the integrity of the exterior surface. Using an unsuitable paint or coating may not provide the same level of protection, so owners should check the requirements for their particular cladding system or seek appropriate professional advice before repainting.
High-pressure waterblasting may also be unsuitable for some cladding systems because it can damage exterior coatings or force water through small gaps and joints.
Good maintenance can help protect a building and address deterioration before it becomes more significant. However, maintenance cannot correct an underlying design or construction defect or establish whether concealed damage is present.
If there are concerns about the condition or weathertightness of a property, specialist advice should be obtained.
What About Moisture Inside the Home?
Not all dampness or mould inside a house is caused by water entering through the exterior.
Cooking, showers, drying clothes and everyday living all create moisture. Insufficient heating and ventilation can contribute to condensation, dampness and surface mould, particularly through Hutt Vally’s colder months.
Appropriate heating, ventilation and extractor fans can help manage internally generated moisture. However, these measures do not address water entering through the building envelope.
Persistent dampness, staining, musty smells, swollen materials or unexplained mould should be appropriately investigated rather than assuming the cause is either condensation or leaking cladding.
What Information Should a Buyer Obtain?
When considering a monolithic-clad property, buyers should try to establish as much reliable information as possible about the home’s construction, condition and history.
Useful information may include the Council property file, approved plans, building consents and Code Compliance Certificates, details of the cladding system, maintenance and repainting records, warranties, previous repairs and any building or weathertightness reports.
There are also building features that may be relevant when a professional assesses weathertightness risk. These can include the roof design, eaves, window and door details, decks and balconies, penetrations through the cladding and clearances between cladding and the surrounding ground or decking.
Visible cracking, failed sealants, staining, musty smells, swollen materials or other signs of moisture may warrant further investigation. Importantly, however, the absence of obvious warning signs does not establish that concealed problems are not present.
Where appropriate, buyers should obtain advice from a suitably qualified and experienced building professional. Depending on the property, a specialist weathertightness assessment may be recommended. It is important to note that a full weathertightness report is not the same as a normal pre-purchase inspection and may involve the need for invasive moisture testing.
Buyers should also make their own enquiries regarding insurance, finance and legal matters before committing to a purchase.
What Should an Owner Provide When Selling?
For owners of monolithic-clad homes, having good information available can make a significant difference when it comes time to sell.
Gathering the Council property file, building consents, Code Compliance Certificates, warranties and records of maintenance, repainting or repairs can help buyers better understand the property.
Owners may also wish to consider obtaining an independent assessment from a suitably qualified and experienced professional before going to market. The appropriate type and scope of assessment, including whether any further or invasive investigation is warranted, should be determined by that professional.
Providing reliable information early gives buyers the opportunity to make an informed decision and can help avoid questions or concerns emerging unexpectedly during a conditional period.
Any report should still be considered within its stated scope and limitations, and buyers should obtain their own independent building, legal, insurance and finance advice where appropriate.
Should You Reclad a House That Is Not Leaking?
Not necessarily.
Recladding is a significant decision and should not be based solely on the assumption that all monolithic-clad homes need to be reclad.
A properly designed, consented and completed reclad may change how a property is viewed by prospective buyers, lenders and insurers. However, the cost can be substantial, and the outcome will depend on the individual property and the requirements of the parties involved.
Before making a decision, an owner should understand the existing condition of the property, obtain appropriate professional advice and consider the likely cost and benefits of the available options.
This might include comparing the property’s value and saleability in its current condition with the potential costs and implications of maintenance, repairs or a full reclad.
Where moisture damage or significant construction issues are identified, specialist advice will be particularly important in determining the appropriate remedial work.
There is no single answer that applies to every monolithic-clad property.
Where Should an Owner Start?
If you own a monolithic-clad home and are thinking about selling, a useful starting point is to establish exactly what you have.
Find your plans and Council records, gather your maintenance and repair history and, where appropriate, obtain advice from a suitably qualified professional about the property’s construction and present condition.
From a real estate perspective, having reliable information available early can make it much easier to have open and informed conversations with prospective buyers.
The key message is simple: don’t assume a monolithic-clad home is leaky, but don’t assume it is problem-free either.
Understand the individual property, gather the available evidence and seek appropriate specialist advice where required.
Important Information
This article provides general real estate information only and is not building, weathertightness, engineering, legal, insurance or financial advice. Monolithic cladding systems and individual properties vary considerably. Owners and purchasers should obtain advice from appropriately qualified and independent professionals regarding the construction, condition and weathertightness of a particular property and should make their own enquiries regarding legal, insurance and finance matters.
This monthly Hutt Valley property feature is prepared and reviewed jointly by Rachael Ayling and Kathryn Campbell. Our knowledge comes from a combined 24 years in real estate, appraising thousands of homes and selling hundreds of properties throughout Hutt Valley.
*Source: Ministry of Business, Innovation and Employment (MBIE), Building Performance, E2 External Moisture – Guide to Using the Risk Matrix.
**Source: Real Estate Authority (REA), Weathertightness Issues.
Contact Details
Rachael Ayling
Licensed Real Estate Salesperson
M: 021 0230 8357
E: rachael@markre.co.nz
Kathryn Campbell
Sales Manager & Licensed Real Estate Salesperson
M: 027 756 2615
E: kathryn@markre.co.nz
Professionals Real Estate
A “thank you” to Rachael Ayling and Kathryn Campbell for sending this article to The Upper Hutt Connection.
07/10/26
