• Masons Roof Underlays are intended for use as a self-supporting roofing underlay
• Assists in moisture control — deflects water and air both during construction and as part of the finished roof
• Temporary weather protection — UV resistance for 21 days — although same-day coverage is strongly recommended

Masons Roof Underlays are certified for use as a roof underlay and air barrier:

• a) on buildings situated in wind zones up to and including Extra High (as set out in NZS3604) with a minimum roof pitch of 3°,
• b) under masonry or metal tile and profiled metal roof claddings,
• c) in all locations including where it is exposed to view

2. Masons Roof Underlay shall be:

• a) installed in accordance with the manufacturer's installation manual, and
• b) installed run vertically or horizontally with or without support for roof pitches greater than 10°, run horizontally with or without support or run vertically with support for roof pitches less than 10°, provided that support is provided where the span is greater than 1200mm, and
• c) protected from direct sunlight within 21 days of installation.

Building Code Provisions

• B2 Durability: B2.3.1(a), B2.3.2
• C3 Fire affecting areas beyond the fire source: C3.4(c)
• E2 External moisture: E2.3.1 (contributes to), E2.3.2 (contributes to) ; E2.3.5 (contributes to), (E2.3.6 (contributes to) E2.3.7
• F2 Hazardous building materials: F2.3.1