Description

The airtightness of low-rise, stand-alone dwellings in New Zealand is fairly well understood. However, before this research little was known about apartments, which represent a significant and growing percentage of new building consents.

BRANZ measured nine apartment buildings as an indication of the airtightness provided by the wider stock of apartments. In general, apartments had levels similar to typical new-build houses, approximately five air changes per hour at 50 pascals on average, with a strong dependence on construction style. Inter-apartment leakage was also investigated.

The airtightness of a building is a measure of how much air can leak through the structure through gaps (when all of the doors and windows are closed). Airtightness is important because it affects the building’s energy efficiency and its ability to maintain a comfortable, draught-free indoor environment.

Scope

This Research Now includes:

• Testing approach
• Observations
• Discussion