Unique Curved Roof Protected with High-Performance Building Wrap

Taylors Mistake seems like an appropriate location for this unique project. But a mistake it is not.

Architect Craig Jarvis from Harmonic Architecture decided to put his hands on the tools for his dwelling near Christchurch with the aim of designing and building something special.

This house, which featured on Grand Designs NZ, has been designed with a curved roof supported by a series of laminated timber beams, covered with a layer or plywood which is protected by a self-adhered building wrap, SOLITEX EXTASANA ADHERO. Terra Lana wool insulation was used to insulate between the beams. A spray on non-toxic water proof roof membrane (NuSkin) has been sprayed on over another layer of plywood, creating the roof cladding. This membrane is suitable for potable water and has no joins, no flashings and no laps. A ventilated cavity has been created between the two layers of ply using a horizontal purlin over packers.

“In my efforts to design and build a smaller, sustainable, non-toxic, affordable, off-grid dwelling, my preference has always been to use, find or develop local solutions. And this by far has proven to be possible. However, sometimes an imported product is just superior in performance and non-toxicity. pro clima’s self-adhesive building wrap ADHERO [SOLITEX EXTASANA ADHERO] was one of those”, says Craig.

“ADHERO is quite amazing — the ability to stick on a building wrap just makes good sense. Piercing the building wrap with hundreds of staples, which you DON’T have to do with ADHERO, just seems stupid now."

"In truth, it was a bit tricky over a curve, but once we developed a method, it went on well. Once on, it’s never coming off! It didn’t come loose when it was smashed by a storm — us and our neighbours were very happy about that. The 180 day guarantee in all weather all on its own was a good enough reason for me to use it. And I will use it again on future projects. It reduces the risk to the dwelling dramatically," says Craig.

"My place was always meant to be an experiment, finding solutions and trialing products. The pro clima gear is just good stuff. It works as it’s meant to and the place is bone dry. The shape of the building made it hard to get products that would do the job well and be cost-effective. Finally, we have a solution that works and were free to install it over 180 days, which was gold!”

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

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