ADHERO: The Weathertight Solution for Multi-Storey Buildings

Dominating the skyline in the West Auckland suburb of Glen Eden is the new Westlight Apartments project currently being built by CMP Construction. The building is comprised of two 10-storey tower blocks above a large podium area, which offer awesome views of the Waitakere Ranges and surrounding areas, and is conveniently located close to the Glen Eden railway station and shops.

Developed by the Ted Manson Foundation, the project aims to provide safe, warm and healthy homes at a more affordable price to the market and differs from most developments of its type as it includes a mix of community housing managed units as well as freehold apartments.

Designed by the team at MC2 Architects, the exterior of the building envelope is covered with Pro Clima SOLITEX EXTASANA ADHERO self-adhesive membrane/underlay, which provides a continuous water and wind-tight WRB (weather-resistive barrier) behind the outer cladding/rain-screen layer. Ensuring the WRB is wind/airtight is more critical on taller buildings for pressure equalisation of the cladding cavity, to ensure moisture is not sucked into the structure. So while the membrane is one of the lowest cost parts of the building's thermal envelope, it is the last line of defence against moisture ingress and plays a major role in guaranteeing its long term performance.

Being so close to public transport will be a big bonus for those living in the apartments, but it also placed more onus on good acoustic design of the facade. On this project, the ADHERO is installed over two layers of 9mm Shera fibre cement sheet (from Pacbuild) over thermally broken steel framing, which along with the joinery systems assists in providing separation between what's going on outside and the interior spaces.

Continuity is key to the performance of the WRB. All penetrations made through the ADHERO from cladding and joinery screw fixings are well sealed with TESCON NAIDECK screw sealing tape. NAIDECK is a butyl rubber tape which is sticky on both sides with a release paper, so is able to be pre applied to brackets prior to their installation on site, to ensure all screw penetrations are sealed. The six months UV exposure resistance of the ADHERO membrane is beneficial on this type of project as well. Due to the logistical challenge of building over many levels, the WRB is often not able to be covered as quick as on a single level build of less complexity. Once protected from the UV light long term, the ADHERO will function as a vapour permeable, water and wind-tight membrane for at least the life of the cladding itself.

Visit the Westlight Apartments website

Self Adhesive Building Wrap (SOLITEX EXTASANA ADHERO)

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

Declare LBC Red List Free

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

Sill Tape (TESCON EXTOSEAL)

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Butyl sill tape for use with wall underlays like SOLITEX EXTASANA and SOLITEX EXTASANA ADHERO and other weathertightness layers.

TESCON EXTOSEAL Sill Tape has been appraised as a flexible flashing system for use around window and door joinery openings for buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1 Paragraph 1:1; and,
with a risk score of 0-20 calculated in accordance with NZBC acceptable solution E2/AS1 table 2; and,
with wall cladding systems complying with NZBC acceptable solution E2/AS1 or a valid BRANZ Appraisal that specifies a flexible flashing system; and,
with flexible wall underlays compatible with flashing tape; and,
situated in NZ3604 Wind Zones up to, and including, Extra High.

TESCON EXTOSEAL Sill Tape has also been appraised as a flexible flashing system for use around window and door joinery openings for steel framed buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1 with regards to the building height and floor plan area; and,
constructed with a steel frame complying with NZBC; and,
with a risk score of 0-20 calculated in accordance with NZBC acceptable solution E2/AS1 table 2; and,
with wall cladding systems covered by a valid BRANZ Appraisal that specifies a flexible flashing system; and,
with flexible wall underlays compatible with flashing tape and steel frame; and,
situated in NZ3604 Wind Zones up to, and including, Extra High.

Used in:

Te Uru Taumatua — Living Building Challenge
Unitec, Weltec and Toi Ohomai student-built homes
Habitat for Humanity
Housing New Zealand

BRANZ Appraised

Sealing Grommets ROFLEX and KAFLEX

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KAFLEX and ROFLEX Grommets are pipe and cable penetration seals consisting of a soft, flexible EPDM rubber and will cope with up to 180 days UV exposure.

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Wall Underlays:

KAFLEX and ROFLEX Grommets have been appraised as pipe and cable penetration seals for use where the penetration is through the wall underlay on framed walls within the following scope:

within the limitations of NZBC Acceptable Solution E2/AS1, Paragraph1.1 with regards to building height and floorplan area
with flexible wall underlays situated in NZS3604 Wind Zones up to, and including, Very High; or
with flexible wall underlays used over rigid wall underlays in accordance with E2/AS1,Paragraph 9.1.7.2, situated in NZS3604 Wind Zones up to, and including, Extra High; or,
with proprietary plywood or fibre cement based rigid wall underlays (rigid air barriers).

The flexible and rigid wall underlays must be covered by a valid BRANZ Appraisal.

Roof Underlays:

KAFLEX and ROFLEX Grommets have also been appraised as pipe and cable grommets for use where the penetration is through the roof underlay on framed pitched roofs within the following scope:

within the limitations of NZBC Acceptable Solution E2/AS1, Paragraph1.1 with regards to building height and floor plan area; and,
with flexible roof underlays fixed over framing or rigid roof sarking; and,
situated in NZS3604 Wind Zones up to, and including, Extra High

The flexible roof underlays must be covered by a valid BRANZ Appraisal.

Specific Design:

— KAFLEX and ROFLEX Grommets have also been appraised for use on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of KAFLEX and ROFLEX Grommets into their design in accordance with the declared properties and the instructions of Pro Clima(NZ)Ltd

In the opinion of BRANZ, KAFLEX and ROFLEX Grommets, if designed, used, 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 B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. KAFLEX and ROFLEX Grommets meet these requirements. See Paragraphs 8.1 and 8.2.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the wall or roof cladding system, KAFLEX and ROFLEX Grommets will contribute to meeting this requirement. See Paragraphs 7.1 - 7.7 and 11.1 - 11.2.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. KAFLEX and ROFLEX Grommets meet this requirement and will not present a health hazard to people.

BRANZ Appraised

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