Allco Recommends ILD Testing for Waterproof Membranes

For clients' peace of mind and as a responsible waterproofing supplier, Allco uses and recommends ILD (International Leak Detection) testing as opposed to invasive flood testing because of its accuracy, reliability and the ability to test the membrane at any time.

Performed by ILD, EFVM (Electric Field Vector Mapping) is a low voltage test method that creates an electrical potential difference between a non-conductive membrane surface and a conductive substrate, which is earthed or grounded.

By applying water on the membrane surface and using the water as a conductive medium, an electric field is created and a breach in the membrane creates a vector (ground fault connection).

The EFVM technician reads the electric flow travelling across the membrane mapping the breaches with pinpoint accuracy.

Advantages of the EFVM testing system:

Exact pinpointing of membrane breaches
Non-destructive to the membrane
Can be performed on sloped structural decks
Membrane defects can be repaired and retested without delay to the construction schedule
Limited use of water required for the EFVM test
Eliminates unnecessary removal of the overburden to locate a membrane breach
Membrane performance can be monitored during its lifespan through the overburden

Where EFVM can be utilised:

Garden roofs
Roofs with ballast
Roofs with paving stones
Exposed membrane roofs
Non-insulated and insulated roof systems
Inverted roof systems
Parking garages/parking decks
Pond/water container liners
Swimming pools

Contact Allco to find out more about their projects with ILD.

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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