Trusted Waterproofing and Warm Roof Systems Chosen

Recently completed, this substantial inner-city residential development encompasses 160 apartments over 14 levels in the vibrant heart of Auckland’s CBD. With a strong client brief that provided a challenge to maximise site potential, PB&A Architects engaged the Allco team to provide a ‘one-stop-shop’ range of waterproofing solutions.

Having a consistent supplier for the above and below ground waterproofing solutions proved to be a huge advantage, not only saving time and money, but also allowing contractors to overcome complexities on the go. The consistent support of Allco's highly qualified TA team ensured the job was done at a consistently high standard providing one full job warranty.

Allco prides themselves on the support they offer along with their systems. Allco has a team of account managers and technical experts that are fully equipped with the knowledge and experience to assist with all aspects of the design and construction process from concept to completion.

Below ground waterproofing: Volclay Voltex waterproofing membrane solution to basement shotcrete walls to allow easy construction staging and methodology
Balconies: Hot melt monolithic membrane applied to 67 balcony decks at zero-degree falls
Podium: Hot melt monolithic membrane applied to low fall structure, allowing a reduction in structural thickness, weight and cost
Main Roof: Casali warm roof, allowing higher ceilings to the interior by placing the insulation above the roof structure

Architects: PB&A Architects
Contractor: Watts & Hughes Construction
Client: Norfolk Trust

Casali Torch On

Allco Waterproofing Solutions

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Casali is an Italian torch-on roofing membrane made of pure bitumen with the highest quality techno-polymers.

Casali Roof and Deck Membrane Systems have been appraised as roof and deck waterproofing membranes on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1; or,
the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regard to building height and floor plan area when subject to specific structural design; and,
with substrates of plywood, fibre cement compressed sheet or suspended concrete slab; and,
with minimum falls for plywood roofs of 1:30, concrete roofs of 1:60 and decks of 1:40; and,
with deck size limited to 40m² and,
situated in NZS 3604 Wind Zones up to, and including, Extra High.
situated in specific design wind pressures up to a maximum design differential Ultimate Limit
State (ULS) of 6 kPa with the weathertightness detailing subject to specific design.

Casali Roof and Deck Membrane Systems have also been appraised for use as roof and deck waterproofing membranes on specifically designed buildings within the following scope:

With building structures designed and constructed to comply with the NZBC; and,
With roof and deck supporting structures of timber framing with substrates of plywood or fibre cement sheet; and,
With substrates of suspended concrete slab; and,
Subjected to maximum wind pressures; and,
With the weathertightness design of all junctions being the subject of specific design by the designer.

In the opinion of BRANZ, Casali Dermabit/Dermafil Roof and Deck Membrane Systems, 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. Casali Dermabit/Dermafil Roof and Deck Membrane Systems meet this requirement. See Paragraph 10.1.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.1 and E2.3.2. Casali Dermabit/Dermafil Roof and Deck Membrane Systems meets these requirements. See Paragraphs 13.1–13.9.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Casali Dermabit/Dermafil Roof and Deck Membrane Systems meet this requirement.

Casali Dermabit/Dermafil Roof and Deck Membrane Systems have been appraised as an Alternative Solution in terms of New Zealand Building Code compliance. The membranes are an alternative to the membranes specified in NZBC Acceptable Solution E2/AS1, and an Alternative Solution subject to specific design for other buildings not covered within E2/AS1.

BRANZ Appraised

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