Residents of low-cost manufactured homes may face higher exposure to potentially harmful plastic additives, Parsons' Healthy Material Lab warns. The lab submitted a materials analysis that connects pervasive use of petrochemical products in a conventional prefabricated house to both health and environmental concerns.
The researchers based their review on documentation for one affordable model sold by Northstar Systembuilt in Minnesota. To record the materials used, the team said it contacted the manufacturer posing as prospective buyers, and selected what it described as "one of the most affordable models from one of the largest manufactured home manufacturers in the US," a choice the authors call typical but not statistically representative.
The report highlights wide application of fossil-fuel plastics across interior surfaces. Parsons identified common polymers including polyethylene, polyvinyl chloride and polypropylene, and said they appear in high concentrations in kitchens and bathrooms. The lab wrote, "The extensive use of petrochemical-based materials in contemporary manufactured housing poses significant health and environmental risks," and added, "Plastics and their associated toxic additives are found in nearly every major surface within a manufactured home, including flooring, paint, cabinetry and insulation."
Parsons' executive design director Jonsara Ruth placed the findings in a broader housing context, saying, "It's true, petroleum-based plastic materials are now widespread in new American homes, not just manufactured ones." Ruth argued that cost pressures in affordable housing can steer builders toward cheaper petrochemical materials, shifting health and environmental costs onto residents and communities.
The lab cites existing public-health research to frame its concerns, including work by Dr Shanna Swan and the Green Science Policy Institute's Six Classes framework, and notes historical episodes such as elevated formaldehyde in temporary housing after Hurricane Katrina. The authors do not claim direct causation linking the materials in this single house to specific illnesses, but they present the material inventory as evidence that exposure pathways exist and merit attention.
As a constructive next step the report recommends alternative materials that could be viable in low-cost prefabrication, naming linoleum in place of vinyl flooring and wood finishes instead of plastic cladding. It also points to past industry efforts to improve materials, including a 2000 collaboration between Enterprise Community Partners and Clayton Homes.
Northstar Systembuilt did not respond to requests for comment. The authors acknowledge the limits of a one-house sample and situate their findings within wider debates over microplastics and indoor exposure. They conclude by calling for design and procurement changes to reduce resident exposure and to lower the sector's environmental footprint.
