Today we began the process of installing the insulation and closing up the walls. We choose Certainteed Sustainable Insulation. (https://www.certainteed.com/insulation/building-insulation-sustainability/) It is made with a large portion of pre-consumer and post-consumer recycled materials. Another reason we choose this material is that it is free of harsh acrylics, dyes, or added formaldehyde. It is also Greenguard GOLD certified ensuring very low or no emissions of volatile organic compounds (VOCs).