A Weather Resistive Barrier Solution for Rainscreen Claddings

The Auckland City Mission project was a great opportunity for Stevens Lawson Architects to implement a range of new technologies on a multi-storey building being built within a tight space.

The project is currently under construction and includes XLAM CLT solid timber structural panels, mineral wool external insulation and a Terracotta rainscreen cladding, with a level of pre-fabrication to minimise time on site. The building will become a landmark once completed and a real asset for the city by providing safe and comfortable long-term housing for Auckland’s homeless population.

Protecting the CLT from external moisture is key to ensuring its durability and structural integrity into the future. To ensure the whole assembly was kept dry from the start, cladding contractors Symonite chose to pre-apply pro clima SOLITEX EXTASANA ADHERO Weather Resistive Barrier (WRB), mineral wool insulation and Terracotta cladding system to the CLT in factory before being transported to site.

pro clima SOLITEX EXTASANA ADHERO (or just ADHERO for short!) is a BRANZ Appraised self-adhesive Weather Resistive Barrier (known as a wall and roof underlay), which consists of a non-porous thermoplastic membrane (TEEE) protected by a layer of UV stable fleece. The product has 10,000mm water column resistance and is airtight yet highly vapour permeable. When installed to a solid substrate such as CLT, pro clima SOLITEX EXTSANA ADHERO offers a high level of resistance against the elements and can be left exposed to UV light for up to 180 days.

On the City Mission project, the joints between the CLT panels were sealed with pro clima TESCON EXTORA flashing tape in situ, and all screw penetrations made by the cladding brackets and insulation pins were sealed with pro clima TESCON NAIDECK butyl sealing strip to maintain the integrity of the membrane. pro clima TESCON EXTOSEAL, a stretchable one piece sill tape, was applied to windows openings as per E2/AS1, which makes it an easy solution for any builder to install.

Once protected from long-term UV exposure, pro clima SOLITEX EXTASANA ADHERO and the system products remain functional for the life of the cladding itself, ensuring the building is an asset to the Auckland region for many years to come.

Contact pro clima NZ Ltd on 0800 PRO CLIMA or [email protected] to discuss the use of pro clima weathertightness solutions on your next project.

Self Adhesive Building Wrap (SOLITEX EXTASANA ADHERO)

pro clima

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ADHERO is a peel-and-stick weathertightness layer for roof and wall application over a solid substrate.

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Appraised (BRANZ Appraisal 989) for use:

Over rigid wall underlays
Over rigid roof sarking
Over roofs and walls of SIP and CLT construction
Specific Design

SOLITEX EXTASANA ADHERO Self-Adhesive Underlay has been appraised for use as a wall underlay over fibre cement and plywood rigid wall underlays on timber and steel framed buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and
with direct fixed absorbent and non-absorbent wall claddings; or
with absorbent and non-absorbent wall claddings installed over an 18 mm minimum drained cavity; or,
with masonry veneer in accordance with NZBC Acceptable Solution E2/AS1 for timber framed buildings or to a specific design for steel framed buildings; and
situated in NZS 3604 Wind Zones up to and including Extra High

SOLITEX EXTASANA ADHERO Self-Adhesive Underlay has also been appraised for use as a roof underlay over plywood roof sarking on timber and steel framed buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and
with roof claddings in accordance with NZBC Acceptable Solution E2/AS1, Paragraphs 8.1 – 8.4; and
situated in NZS 3604 Wind Zones up to and including Extra High

SOLITEX EXTASANA ADHERO Self-Adhesive Underlay has also been appraised for use as a wall and roof underlay when used on buildings within the following scope: p

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and
used on buildings constructed from Structural Insulated Panels (SIPs); or
used on buildings constructed of Cross Laminated Timber (CLT); and
with absorbent and non-absorbent wall claddings installed over an 18 mm minimum drained cavity; or,
with masonry veneer to a specific design for SIP or CLT buildings; and,
with roof claddings in accordance with NZBC Acceptable Solution E2/AS1, Paragraphs 8.1 - 8.4; and,
situated in NZS 3604 Wind Zones up to and including Extra High. (Note: CLT and SIP construction systems have not been assessed and are outside the scope of this Appraisal. See also Paragraph 7.12.)

SOLITEX EXTASANA ADHERO Self-Adhesive Underlay has also been appraised for use over rigid wall underlays or roof sarking on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of SOLITEX EXTASANA ADHERO® Self-Adhesive Underlay into their design in accordance with the declared properties and the instructions of Pro Clima (NZ) Ltd.

SOLITEX EXTASANA ADHERO Self-Adhesive Underlay, if used, designed, installed and maintained in accordance with the statements and conditions of BRANZ Appraisal 989, will meet, or contribute to meeting the following provisions of the NZBC:

Clause B2 DURABILITY: Performance B2.3.1 (a), not less than 50 years, B2.3.1 (b), 15 years and B2.3.2. SOLITEX EXTASANA ADHERO Self-Adhesive Underlay meets these requirements. See Paragraphs 9.1 and 9.2. e
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the roof or wall cladding system, SOLITEX EXTASANA ADHERO Self-Adhesive Underlay will contribute to meeting this requirement. See Paragraphs 12.1 and 12.2.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. SOLITEX EXTASANA ADHERO Self-Adhesive Underlay meets this requirement and will not present a health hazard to people.

BRANZ Appraised

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