GIB Weatherline Passes Extensive Testing to Meet NZBC Requirements

This is the first time that GIB has developed systems specifically for the outside of the building and the company has gone to great lengths to make sure that GIB Weatherline products are suitable for New Zealand conditions. The extensive testing programme has included full-scale wind pressure, weather tightness, fire, bracing and environmental noise to produce a range of market-ready performance options. There have also been hundreds of small scale bench tests ensuring that the quality assurance meets consistent standards.

One of the most severe tests GIB Weatherline was put through in order for GIB to be able to claim temporary weather protection for the exterior of a building for up to 90 days, was the BRANZ Weather Tightness Performance Limit Test.

This test involved a continuous water spray of 24 litres per minute directed onto a 2.4m tall x 2.4m wide timber frame wall lined with GIB Weatherline for a period of four hours. During this four-hour water spray period, the lined wall was also subjected to a 70 Pa (Pascal) positive air pressure. This positive air pressure worked to force water into the lining, through the sheet joints and along the line of any sheet fasteners. This was where the performance of the GIB Weatherline Flashing Tape came to the fore.

Upon completion of the test, the laboratory technicians found no visible signs of any water on the back of the lining and there was no increase in the moisture content of the timber frame in the eight designated measurement locations.

This result meant GIB had passed the test and added to their confidence that the GIB Weatherline Rigid Air Barrier Systems were suitable for the New Zealand environment.

For designers' convenience, a Technical Manual has been developed to cover buildings designed within the scope of NZS 3604 and offers five key sections (two rigid air barrier options, structural bracing elements, fire rated walls and a range of environmental noise options). For the first time, GIB is able to offer fire rated wing wall and parapet options in both 30 min Fire Resistance Rating (FRR) and 60 min FRR.

For buildings requiring specific design, GIB has developed the Specific Design Technical Data Sheet. This document allows a suitably qualified professional to take the product performance data and incorporate it into their design.

GIB Weatherline Rigid Air Barrier System

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Used as a component in GIB Weatherline Rigid Air Barrier Systems, GIB Weatherline sheets feature a water and mould resistant fibreglass reinforced gypsum core and a water resistant glass fibre sheet facing for excellent water, mould and fire performance.

Can have the added benefit of providing bracing, fire and acoustic performance.

System Description:

GIB Weatherline Systems have been appraised by the Building Research Association of New Zealand (BRANZ), Appraisal No. 1048 (2019) and meet the NZ Building Code requirements for rigid underlays (rigid air barriers). GIB Weatherline System components include a range of 10mm and 13mm GIB Weatherline sheets which can be exposed to weather for up to 90 days prior to cladding installation as well as GIB Grabber Ceramic Coated fasteners, and GIB Weatherline Flashing and Sill Tapes, specially designed and tested for use in GIB Weatherline Systems.

GIB Weatherline Systems are suitable for use in both residential and commercial buildings and have been tested for wind speeds up to and including Extra High wind zone as defined in NZS 3604.

Technical information is available to allow specific design for buildings outside the scope of NZS 3604.

Extra High Wind Zone

Specific Design Wind Zone

In the opinion of BRANZ, GIB Weatherline Rigid Air Barrier Systems, if used, designed, installed and maintained in accordance with the statements and conditions of this Appraisal, will meet, or contribute to meeting the following provisions of the NZBC:

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. GIB Weatherline Rigid Air Barrier Systems meet the requirements for loads arising from earthquake and wind [i.e. B1.3.3 (f) and (h)]. See Paragraphs 12.1 – 12.6.
Clause B2 DURABILITY: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2. GIB Weatherline Rigid Air Barrier Systems meet this requirement. See Paragraph 13.1.
Clause C3 FIRE AFFECTING AREAS BEYOND THE FIRE SOURCE: Performance C3.7. GIB Weatherline Rigid Air Barrier Systems can be used to meet this requirement by providing passive fire and smoke protection. See Paragraphs 15.1 and 15.2.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the cladding system, GIB Weatherline® Rigid Air Barrier Systems will contribute to meeting this requirement. See Paragraphs 16.1 and 16.2.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. GIB Weatherline® Rigid Air Barrier Systems meet this requirement and will not present a health hazard to people. 3.2 GIB Weatherline® Rigid Air Barrier Systems can be used to satisfy the bracing demand requirements of Section 5 of NZS 3604 which is an NZBC Acceptable Solution

See BRANZ Appraisal 1048 for full information.

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