• Suitable and appraised for use as a wall underlay on steel and timber framed buildings
• Suitable and appraised for use over rigid wall underlays on steel and timber framed buildings
• Appraised for use on buildings subject to specific weathertightness design
• Can be used with Rigid Air Barriers in Extra High Wind Zones
• Suitable where flame retardant wall underlays are specified 

Used as secondary weathertightness protection, and also to provide some protection of framing and structure during construction, however must not be left exposed to weather or UV for more than 60 days. Does not permit early enclosure.

NZBC Clauses:

• B2 Durability: B2.3.1 (a), not less than 50 years, B2.3.1 b), 15 years and B2.3.2
• E2 External Moisture: Performance E2.3.2. When used as part of the cladding system, HYDRA Wall Underlay will contribute to meeting this requirement
• F2 Hazardous Building Materials: F2.3.1. HYDRA Wall Underlay meets this requirement and will not present a hazard to people

European supplier with over 25 years of experience. Hydra Classic has been in the market for XX years

• UV stable 60 days
• Flammability Index of 1