Benefits of cavity taken for granted.

The unassuming weatherboard home has a lot going for it.

Among the advantages of the age-old New Zealand home construction method is the humble cavity - the space between the gib inside surface and the exterior timber.

Prior to the leaky building era, few Kiwis gave much thought to that space between their walls. But it's really important and something worth considering when choosing a house to buy.

The concept of a cavity dates back to the mid-19th century, says Gerard Ball, Principal, chartered & registered building surveyor at Babbage.

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NZIBS building inspector Gerard Ball says properties that make the grade like this one in Flat Bush, south Auckland, are increasingly few and far between.