Allco’s School Tanking and Roofing Solutions Backed With Quality Assurance Checks

In 2014 Allco worked with Robert Cunningham Construction on a gymnasium building project at St Mary’s College, St Mary Bay. The architects, RCG, specified a range of Allco’s products. Sanjev Rejendra of RCG said, "I think your company has taken a remarkable step having a Quality Assurance Officer doing consistent and regular checks — this gives us architects peace of mind and confidence in your products."

The project required a Volclay tanking system to be applied to the footings and precast panel retaining walls, lift pit and storage areas, while Casali Dermabit Extra Double Layer Torch-On was applied to the plaza deck, roof and gutter. Allco provided a detailed design and specification for the transition between the tanking and plaza deck, where floating tiles were installed over the double layer torch-on membrane. The applicator used was MPM Waterproofing Services Ltd, who applied Volclay (800m²) and Casali (500m²) with 10 quality assurance visits during the waterproofing process.

Over the last 15 years Allco Waterproofing Solutions have provided tanking and roofing solutions to over 100 major school projects nationwide. On these projects Allco have provided their onsite Quality Assurance Inspection Programme — this includes pre-installation meeting and on-site inspections prior to concrete pour. Every inspection is documented with photographs taken, and this quality assurance information is retained on Allco’s server and is available to the client, construction company and the waterproofing applicator. One of the benefits is that it provides peace of mind for all parties involved, including one of the most transparent warranty certificates available in the building industry.

Allco are able to provide a range of products catering to the needs of the education sector including primary, intermediate, colleges and universities. Allco are currently working on the Waikato University project, installing a 2,500m² single layer TPO membrane green roof.

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

Volclay Swelltite

Allco Waterproofing Solutions

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Volclay Swelltite is a bentonite waterproofing membrane designed for below grade masonry block, split-slab deck and plaza construction.

Swelltite is designed for waterproofing below-grade vertical and horizontal structural surfaces, as well as, above grade split-slab construction used with plaza areas, parking garages and sports stadiums.

Swelltite is excellent for:

Below-grade masonry block walls
Split-slab Plaza Deck Construction
Cut & Cover Tunnels
Masonry Block Foundation Walls
Concrete Foundation Walls
Earth-covered Structures

Installation:

Ready for use and requires no set-up
Does not require torching or priming
It can be applied in all weather conditions to green concrete
Can be installed in temperatures below freezing

In the opinion of BRANZ, the Volclay Waterproofing System if designed, used, installed and maintained in accordance with the statements and conditions of this Appraisal, will meet the following provisions of the NZBC:

Clause B2 DURABILITY: Performance B2.3.1 [a] not less than 50 years. the Volclay Waterproofing System meet this requirement. See Paragraph 14.1.
Clause E2 EXTERNAL MOISTURE: Performance E2.33. the Volclay Waterproofing System meet this requirement. See Paragraphs 16.1 - 16.3.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. the Volclay Waterproofing System meet this requirement and will not present a health hazard to people.

BRANZ Appraisal is of an Alternative Solution in terms of New Zealand Building Code compliance.

BRANZ Appraised

Volclay Voltex DS & DS/SWR

Allco Waterproofing Solutions

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Bentonite-Geotextile waterproofing system with Integrated Polyethylene Liner, used as a damp-proofing or waterproofing membrane below ground to protect basements and other underground structures against water penetration and water vapour transmission from the ground.

The Volclay Waterproofing System has been appraised for use as:

an external waterproof tanking membrane to in-situ concrete, precast concrete and concrete masonry basement constructions subject to hydrostatic pressures of up to 2 bar (20 metres); and,
a damp-proof membrane (DPM) to slab-on-ground and basement constructions; and,
a waterproof membrane to plaza deck roof structures

Clause B2 DURABILITY: Performance B2.3.1 (a) not less than 50 years. The Volclay Waterproofing System meets this requirement. See Paragraph 14.1.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.3. The Volclay Waterproofing System meets this requirement. See Paragraphs 16.1 – 16.3.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. The Volclay Waterproofing System meets this requirement and will not present a health hazard to people.

This is an Appraisal of the Volclay Waterproofing System as an Alternative Solution in terms of New Zealand Building Code compliance.

BRANZ Appraised

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