Description

Roof space ventilation provides air exchange in the spaces above the ceiling insulation and below the roof cladding. 

The purpose of roof space ventilation in New Zealand's climatic environment is primarily moisture management, keeping moisturesensitive building elements dry to maintain performance and durability.

This bulletin investigates ventilation options for different ceiling and roof types.

Scope

This bulletin covers: 

• Ventilation for different roof types
• Condensation and transport of moisture
• Sources of roof moisture
• When to ventilate
• Ventilation design considerations