You can carry out a basic visual inspection of your home's monolithic cladding yourself, and it's a smart starting point — but a proper risk assessment goes well beyond what most homeowners can reliably do without specialist knowledge and tools. Given the serious consequences of undetected moisture ingress, getting a qualified building inspector involved is strongly recommended, especially before buying or selling.
What Is Monolithic Cladding and Why Does It Matter?
Monolithic cladding refers to exterior wall systems that appear as a single, seamless surface — typically stucco (plaster), EIFS (Exterior Insulation and Finish Systems), or fibre-cement sheet systems applied over a timber-framed wall. These systems were widely used in New Zealand homes built roughly between the late 1980s and early 2000s.
The problem is that many of these homes were built without adequate cavity drainage behind the cladding. When moisture gets in through cracks, poorly sealed joints, or around windows and penetrations, it has nowhere to go. The result can be serious timber framing rot and structural damage — sometimes hidden behind a wall that looks perfectly fine from the outside. This became known as New Zealand's "leaky home" or "leaky building" crisis, and it affected tens of thousands of properties.
BRANZ has published extensive research on moisture risks in monolithic cladding systems, and MBIE Building Performance provides guidance on the NZ Building Code requirements that now apply to cladding systems, including the critical Clause E2 (External Moisture).
What You Can Check Yourself
As a homeowner, a careful visual inspection is a reasonable first step. Here's what to look for:
- Cracks in the cladding surface — particularly around windows, doors, corners, and penetrations (pipes, vents, meter boxes)
- Gaps or missing sealant at joints, flashings, and where the cladding meets joinery
- Staining, efflorescence (white salt deposits), or discolouration on the cladding surface
- Soft or spongy areas if you can safely press on the cladding (this may indicate wet substrate beneath)
- Condition of the base of walls — look for rot, swelling, or paint failure near ground level or decks
- Poorly detailed junctions — flat or low-pitched roofs meeting walls, parapets, or decks attached directly to the house without proper flashing
- Interior signs — water staining on interior walls or ceilings, musty smells, or mould near exterior walls
Take photos and note the locations of anything concerning. This information is useful when briefing a professional.
What You Cannot Reliably Do Yourself
Visual checks have real limits. Moisture damage in monolithic cladding is often hidden inside the wall cavity and invisible from the surface until it's severe. A proper assessment typically involves:
- Moisture meter readings taken at multiple points across the cladding and framing
- Invasive or semi-invasive probing — drilling small holes or removing sections of cladding to inspect the cavity and framing directly
- Thermal imaging in some cases, to detect moisture patterns
- Assessing the original construction details against the NZ Building Code and relevant standards
- Evaluating the risk profile based on design features (parapets, low eaves, deck connections, window detailing)
Without these tools and the knowledge to interpret results, it's easy to miss serious problems — or to worry unnecessarily about something that's actually well-sealed and performing fine.
Understanding the Risk Factors
Not all monolithic cladding homes are equally at risk. A higher-risk profile generally includes:
| Risk Factor | Higher Risk | Lower Risk |
|---|---|---|
| Eave overhang | Minimal or none | 450 mm or more |
| Cavity behind cladding | No cavity (direct fix) | Drained cavity present |
| Deck attachment | Deck attached to house | Freestanding deck |
| Roof design | Flat/parapet roof | Pitched roof with good overhang |
| Window installation | No rebate or flashing | Properly flashed and rebated |
| Age | Late 1980s–early 2000s | Post-2005 (better code compliance) |
Homes built after around 2005 are generally lower risk because updated NZ Building Code requirements and better industry practice improved cladding installation standards significantly.
When to Call a Professional
You should engage a qualified building inspector or Licensed Building Practitioner (LBP) with experience in monolithic cladding if:
- You are buying or selling a home with monolithic cladding
- You notice any of the visual warning signs listed above
- Your home is a direct-fix (no cavity) monolithic system built before 2005
- You want to renovate or re-clad — this may require a building consent, and your local council can advise
- You need a report for insurance or mortgage purposes
A specialist building inspector will provide a written report with moisture readings, photos, and recommendations. This is very different from a standard pre-purchase building inspection, so make sure you specifically request a monolithic cladding assessment.
You can find qualified local building inspectors and LBPs on tradedirectory.co.nz. Check that any LBP you engage is currently registered at Licensed Building Practitioners.
If remediation work is needed, depending on the scope it may require a building consent from your local council. Always check with your council before starting any re-cladding or significant repair work. Consumer NZ also has useful guidance on homeowner rights if you're dealing with a leaky building situation.
Safety Note
If you're climbing ladders to inspect upper-storey cladding, follow safe ladder practices and consider your own safety first. For anything above single-storey height, leave the physical inspection to a professional with the right equipment.
Licensed Building Practitioner (LBP)
BCITO Qualified
