Membrane Overlay Offers a Smart Solution for Minimising Roof Construction Waste

With the rapid development of sustainable building in New Zealand, Viking Roofspec has identified the importance of offering a range of sustainable roofing solutions that not only keep the water on the outside for good but also reduce the impact on the environment and where applicable, assist with a building’s Green Star Rating.

It is disturbing that construction and demolition waste makes up half of New Zealand’s total waste going to landfill. Viking Roofspec is constantly learning and adapting new ways to offer more sustainable waterproofing solutions. Tearing down well constructed, compliant structures does not support that ethos as it is unnecessary; expensive and irresponsible even.

Membrane overlay is a highly effective solution to minimising roof construction waste.

Virtually any existing roofing material, including metal, can be overlaid (providing the substrate is structurally sound), and over 90% of Viking roofing materials can be used as an overlay option, allowing old roofs to remain in place — minimising noise, dust, traffic pollution, and overall unnecessary waste in landfills.

Viking offers some membrane-only solutions including Enviroclad FBS — a fleecebacked membrane that goes over old bitumen roofs amongst others. However, Viking’s warm roof system is the most sustainable of Viking’s overlay options. Viking WarmRoof consists of rigid polyiso insulation panels waterproofed by a CodeMark certified Viking waterproofing membrane; the whole assembly is installed on top of the existing roof.

A Viking WarmRoof is a practical solution for overlaying a tired, existing low-slope roof. The benefit for building owners is the existing roof does not need to be removed (*conditions apply), avoiding the expense and waste of shrink-wrap, if applicable (which will then also end up in landfill), and the environmental cost of disposing of potential ‘nasties’. The additional, surprisingly expensive exercise of temporarily relocating people (called 'churn') is also avoided with an overlay.

Whether it is supplying materials cut-to-length to minimise waste, providing 100% recyclable products; membrane solutions without adhesives; or multiple overlay options, Viking is dedicated to finding solutions that reduce their environmental impact.

All Viking warm roof systems are backed by a 20-year warranty and can only be installed by an Approved Applicator.

For more information on Viking Enviroclad FBS or Viking WarmRoof, please visit the Viking Roofspec website.

*A proviso worth noting, is that neither Viking nor any of the approved applicator companies it supplies materials to, will overlay its materials on an existing roof that is not structurally sound. Installing onto old roofs that are beyond repair is irresponsible. Thorough inspections are vital to ensure the integrity of the existing substrate before overlaying.

WarmRoof System

Viking Roofspec

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The most commonly accepted definition of a warm roof (for low slope roofs) is 'a roof where the insulation is installed on top of the roof structure' i.e.

NZ-Owned Business

The Viking WarmRoof System has been appraised for use as an insulating roof on buildings within the following scope:

the scope limitations of NZBC Acceptable Solution E2/AS1, paragraph 1.1 with regards to building height and maximum floor plan areas; and,
on limited access flat roofs with concrete, plywood or steel structural decks subject to specific structural design; and,
with roofs constructed to drain water to gutters and drainage outlets complying with the NZBC; and,
with roofs constructed to suitable falls (refer paragraph 15.3 and 15.4 of the Viking Warm Roof BRANZ Appraisal); and,
with no integral roof gardens; and,
situated in NZS 3604 Building Wind Zones, up to, and including Extra High

The Viking WarmRoof System has also been appraised for durability and thermal performance as an insulated roofing system on buildings that are the subject of specific design with no building height restriction. Building designers are responsible for the building design and for the incorporation of the Viking WarmRoof System into their design in accordance with the declared properties and instructions of Viking Roofspec.

Clause B1 STRUCTURE: Performance B1.3.1. The Viking WarmRoof System meets this requirement.
Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years. The Viking WarmRoof System meets this requirement. See paragraph 10.1 of the Viking WarmRoof BRANZ Appraisal.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.1 and E2.3.2. The Viking WarmRoof System meets these requirements. See paragraphs 15.1 — 15.9 of the Viking Warm Roof BRANZ Appraisal.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. The Viking WarmRoof System meets this requirement and will not present a health hazard to people.
Clause H1 ENERGY EFFICIENCY: Performance H1.3.1 (a). The Viking WarmRoof System will contribute to meeting this requirement. See paragraph 14.1 of the Viking WarmRoof BRANZ Appraisal.
Clause C/VM2 FIRE PERFORMANCE (of wall and ceiling linings) — ISO9705, Group 1S = highest possible rating.

BRANZ Appraised

Enviroclad FBS (Fleece-Backed System) Membrane

Viking Roofspec

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Viking Enviroclad FBS (fleece-backed system) is Enviroclad with a 'fluffy' polyester layer that has been factory-laminated to the underside.

Energy Star

NZ-Owned Business

Viking Enviroclad FBS Membrane System is suitable for use as a roof and deck waterproofing membrane on buildings within the following scope:

the scope limitations of NZS 3604:2011 and NZBC Acceptable Solution E2/AS1, paragraph 1.1; or,
the scope limitations of NZBC Acceptable Solution E2/AS1, paragraph 1.1 with regards to building height and floor plan area when subject to specific structural design; and,
situated in NZS 3604:2011 Wind Zones, up to, and including Extra High; and,
with substrates of plywood or suspended concrete slab.

Viking Enviroclad FBS Membrane System is also suitable for use as a roof and deck waterproofing membrane on specifically designed or existing buildings within the following scope:

subject to specific structural and weathertightness design situated in wind pressures up to a maximum design differential ultimate limit state (ULS) of 2.7 kPa; and,
with substrates of plywood or suspended concrete slab.
with the weathertightness design of junctions for each specific structure being the responsibility of the building designer.

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4 (b) (c) (d) (e) for the relevant physical conditions of B1.3.3 (a), (c), (e), (h), (m) and (p) Viking Enviroclad FBS Membrane System meets this requirement.
Clause B2 DURABILITY: Performance B2.3.1 (b) and B2.3.2 (a), 15 years. Viking Enviroclad FBS Membrane System meets this requirement.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.1, E2.3.2 and E2.3.2 and E2.3.7 (b) and (c). Viking Enviroclad FBS Membrane System meets these requirements.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Viking Enviroclad FBS Membrane System meets this requirement and will not present a health hazard to people.

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