The mould keeps coming back. You've painted over it, wiped it down, bought a dehumidifier. The problem is that most people who deal with condensation and mould in New Zealand are equipped to treat it — not diagnose it. Here's who does what, and when you need building science rather than a mop.

If you want to become an accredited airtightness tester in New Zealand, there is one training provider in the Southern Hemisphere with ATTMA accreditation: BEO Buildingscience. Here's what each course covers and which one is right for you.

You've had a gaseous fire suppression system installed. Before commissioning — and periodically thereafter — the protected enclosure must be tested to confirm it can retain the suppression agent long enough to extinguish a fire. Finding a qualified provider to carry out that test in New Zealand is not straightforward. Here's what you need to know.

Most projects default to the H1 schedule method because it's familiar — and skip straight to modelling when that doesn't work. The Calculation Method sits in between, and it's the most underused of the three. Here's how to choose the right pathway from the start.

The blower door fan comes out of the door frame, the tester hands over the result, and the number is higher than you needed. Airtightness failures are almost never random — the same leakage pathways appear on site after site. Here's why, and what to do about it.

A blower door test takes about an hour on site. The preparation — what your team does in the days before the tester arrives — determines whether that hour produces a result you can use, or whether you're booking a retest. Here's exactly what to do, what to seal, and how to run a shakedown before the accredited tester shows up.

You turn the heater on, the house warms up, and the moment you turn it off the cold is back. Condensation on the windows every morning. Stale air that won't shift. This isn't bad luck — it's building physics. Here's what's actually going wrong, and what to do about it.

Most “wellness homes” sell candles and tubs in buildings that fail basic comfort. This post puts thermal comfort and indoor air quality back on top, using the logic of ASHRAE 55 / ISO 7730 to shape homes where people can just breathe, sleep and live well – with daylight as the finishing touch, not the whole story.

The most expensive mistake in residential solar isn't the brand of panel. It's the timing of the conversation. By the time most homeowners call a solar installer, the decisions that matter most have already been made by someone else.

Everyone’s flexing blower‑door numbers, but your client doesn’t live in ACH50 – they live in drafts, noise and power bills. This post translates airtightness results into real‑world comfort, explains why a tight house is not automatically a Passive House, and shows where airtightness genuinely pays off.

Everyone’s flexing blower‑door numbers, but your client doesn’t live in ACH50 – they live in drafts, noise and power bills. This post translates airtightness results into real‑world comfort, explains why a tight house is not automatically a Passive House, and shows where airtightness genuinely pays off.

Climate resilience in buildings is becoming one of the most important topics in housing this year — and for good reason. More extreme weather events, homes losing power, rising overheating risk, mould and health concerns, and rising energy costs are all exposing the same problem: a lot of homes look efficient on paper but struggle when conditions get difficult. This series breaks down what climate resilience in buildings actually means, why compliance alone doesn't cut it, and what makes a home genuinely stable, healthy, and low-risk in real-world conditions.

Most “mold problems” are really ventilation problems with better PR. This post shows how to talk about moisture and mold with clients in plain language, why balanced low air‑flow ventilation should usually be first in the budget queue, and what that looks like in a real house, not just a brochure.

Get a clear, no-nonsense guide to how MVHR, range hoods and make-up air actually work together in an airtight home. We walk through real numbers, simple examples and the awkward bits most people skip over – like fireplaces, backdraughting and when “just open a window” is not good enough. After 15+ years testing buildings, BEO Buildingscience shows you how to design kitchen ventilation that keeps your air clean, your fire safe and your clients happy.

Most compact homes overheat not because the windows are “too big”, but because the physics is on holiday. This post walks through three simple design moves – external shading, smarter glazing placement and real night‑purge ventilation – that keep big glass, protect your facade and actually cool the house down.

Passing NCC condensation compliance doesn’t guarantee your building is dry. We use WUFI modelling and AIRAH DA07 criteria to uncover hidden risks, keep mould out, and design assemblies that actually work — not just on paper.

Think your home’s a bit leaky, so you don’t need ventilation? Hate to break it to you—but unless your house is practically a tent, you’re not leaking nearly enough air to deal with moisture. This article breaks down how much ventilation you actually need and why most homes in NZ are nowhere near it.

Most people think a bathroom fan is enough to keep their home dry — but it’s not doing what you think. In this post, we break down how much moisture people actually add to the air, why that matters for your health and building durability, and how long your fan really needs to run to do its job.