When alteration and addition projects involve ageing roof systems, architects and builders face a familiar challenge, balancing performance requirements with project constraints. Viking's Enviroclad FBS (fleece-backed system) transforms this equation by offering a sophisticated overlay solution that addresses the complexities inherent in retrofit roofing.

Design process benefits

Unlike single-ply alternatives that telegraph substrate imperfections, the 1.4mm polyester fleece backing bonds with existing surfaces; whether old bitumen, malthoid, or rough concrete to create a smooth aesthetic finish. This forgiving characteristic allows architects to specify over a wider range of existing conditions without extensive substrate remediation*, simplifying both design documentation and risk assessment.

The system's compatibility with Viking WarmRoof and WarmSpan systems also provides design flexibility when thermal performance upgrades are required alongside waterproofing renewal.

Installation advantages

The Enviroclad FBS overlay system delivers significant project efficiency gains through: (i) elimination of strip-out operations and cost, (ii) reduction in waste as the old roof surface doesn’t fill up our landfill, and (iii) the weather exposure risks that accompany full roof replacement. This is particularly valuable in occupied buildings where watertightness is even more critical.

The TPO membrane features heat-weldable seams and proprietary TPO-weldable accessories, with wide rolls up to 3.66m (111.26m² per full roll). This translates to faster installation and fewer potential failure points.

Cost and compliance benefits

The economic advantages extend beyond material savings. By avoiding structural exposure and the need for temporary protection, projects can maintain occupancy and avoid costly relocations. The membrane's enhanced puncture resistance — 33% greater than standard membranes, provides additional durability assurance for long-term performance.

Viking’s Enviroclad FBS is CodeMark Certified and BRANZ Appraised and backed by a 20-year product warranty. The performance of any construction material rests heavily on the standard of workmanship in its installation. All Viking systems can only be installed through Viking’s Approved Applicator network and their licensed installers.

Performance specifications

The system combines high UV resistance with excellent reflectivity, contributing to building thermal performance. Water potability certification and formulation for diverse climate conditions make it suitable for various building types and locations across New Zealand.  

For alteration projects where roof renewal represents a significant scope component, Enviroclad FBS offers a pathway that minimises disruption while maximising performance.