The choice for a house frame, breathing-wise, was slim: hardwood or steel. We chose hardwood because it's less volatile than pine, which has different terpenes. I will be getting stuck into a post sharing my research on building with a steel frame, as it seems like the obvious choice for people with MCS/and or CIRS aka mould illness or Lyme. I think I've found some good tips on … [Read more...] about A Custom Hardwood House Frame by Calco