Description

Warm roofs are becoming increasingly popular in residential builds, offering improved thermal performance, energy efficiency and reduced risk of condensation and mould compared to cold roof systems.

They also support the performance of services like ducted heating and ventilation systems. While traditionally used in commercial construction, warm roofs are now a growing feature in New Zealand homes.

This bulletin explores how and why to use them in domestic settings.

Scope

This Bulletin covers:

• Introduction
• Warm roof construction
  • Warm roof using a waterproof membrane
  • Warm roof using structural insulated panels
  • Warm roof using battens and profiled metal roof cladding
• Replacing an existing cold roof with a warm roof
• Further information
  • BU677 Specifying roofs under H1
  • BU630 Roof space ventilation
  • BU695 Structural insulated panels