NZS 3604 Definitions open sheltered and closed BRANZ Guideline May 2011

Issue 28 – June 2011

NZS 3604 uses a number of definitions to describe where a component is located.

  • An open subfloor is one where the subfloor ventilation is more than 7000 mm2 of clear opening for each m2 of floor area.
  • A sheltered subfloor is one that has a ventilation area of up to 7000 mm2 of clear opening for each m2 of floor area (twice the minimum required).
  • A closed space is a dry internal location not subject to airborne salts or rain wetting such as where rafters or wall studs are located.

Information supplied by BRANZ.

Related Standards

Published in building.