Aside from building materials that present obvious and accepted hazards to health (asbestos, leadpaint etc) it is PVC that generates the most discussion when exploring the Materials RedList imperative in Living Building Challenge training or workshop sessions. To design and construction buildings that are PVC free seems impossible to many, but LBC projects are doing just that through viable alternatives.
The Perkins+Will white paper, Healthy Environments, Whats New (and Whats Not) with PVC published last week (16th Nov) reviewed why PVC is on their ‘precautionary list’ in light of recent advances in PVC chemistry and manufacture. The white paper, a collaboration with the Healthy Building Network, to promote health in the built environment, concluded that despite advances in production, PVC should remain on their precautionary list.
Influential materials rating systems, including the Living Building Challenge building certification and Cradle to Cradle product certifications recommend avoiding PVC. Influential building owners such as Kaiser Permanente and Google have adopted PVC avoidance policies. Perkins+Will, an international architecture practice with about 1,000 architects, included PVC in its Precautionary List as a substance for which to seek alternatives.
“Exposure to a single PVC fire can cause permanent respiratory disease… Due to its intrinsic hazards, we support efforts to identify and use alternative building materials that do not pose as much risk as PVC to fire fighters, building occupants or communities.” Richard M Duffy, International Association of Fire Fighters139
This does not mean that Perkins+Will has eliminated the specification of all PVC-based products. Instead, in keeping with the precautionary principle, when evidence indicates a relevant adverse finding as it relates to human health or negative environmental impact, Perkins+Will seeks to, where possible and appropriate, present alternatives to building owners for their consideration. The goal is to empower design teams to make informed decisions, recognising that this is an issue where scientific certainty is elusive.
Perkins+Will includes PVC on the Precautionary List because it presents hazards to people and the environment, beginning with its synthesis and continuing through its manufacture into products, use, and additional significant hazards during its disposal or recycling.
The white paper includes detailed analysis on the Health Hazards Associated With PVC and Hazardous Emissions from PVC, but the section on Avoiding PVC hazards through substitute materials will be of great help for those seeking PVC free constructions.