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April 13, 2016

NSF / ANSI 347: Single-Ply Sustainability

Long-term, watertight protection, with minimal maintenance requirements, is the primary purpose of any commercial roofing system. Once that objective is secured, then “secondary” benefits should be considered. One of those benefits is how a roofing system can contribute to sustainability goals.

Reflectivity is one aspect of sustainability, and high reflectivity coupled with high emissivity (the ability of a material to release heat) can significantly reduce a commercial facility’s energy consumption. But there are several other aspects of a roofing system that contribute to overall sustainability, and several standards and guidelines attempt to quantify those advantages.

nsf logoOne of those standards, NSF/ANSI 347, Sustainability Assessment for Single Ply Roofing Membranes, evaluates and certifies the sustainable attributes of single-ply roofing membranes over their entire life cycle. Single Ply Roofing Membranes, as defined by this standard, include, but are not limited to, roofing membranes made from PVC, EPDM, and TPO.

NSF / ANSI 347 uses a point system to evaluate and certify roofing membranes in several areas, including (from the web site):

  • Product Design – Integration of environmental and life cycle thinking into the product design process
  • Product Manufacturing – Quantification of the environmental impacts from manufacturing, and actions to reduce or eliminate those impacts
  • Membrane Durability – Membrane physical properties, service life, and reparability
  • Corporate Governance – Human rights, child labor, forced labor, employee safety and education, and community responsibility
  • Innovation

According to NSF / ANSI:

“Product Design criteria require a prerequisite of an environmental assessment program that considers environmental attributes and impacts of products and packaging across the entire product life cycle (e.g., raw material extraction, manufacturing, use, and end of life). Criteria examples in Product Manufacturing include environmental management systems, energy conservation, waste minimization, water conservation and greenhouse gas reductions. Certification is based on point totals to achieve a Conformant Silver, Gold, or Platinum level.”

Manufacturer Duro-Last® Roofing has achieved NSF / ANSI 347 Gold Certification for all of its roofing membrane product lines and, as a Platinum Contractor for Duro-Last Roofing, Royalty is authorized to install them all. If your facility is in need of new roof, let Royalty install a new Duro-Last system that will get you watertight and deliver other sustainability benefits.


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