GBA Logo horizontal- Facebook- LinkedIn- Email- Pinterest- Twitter- Instagram- YouTube Icon- Navigation Search Icon- Main Search Icon- Video Play Icon- Audio Play Icon- Headphones Icon- Plus Icon- Minus Icon- Check Icon- Print Icon- Picture icon- Single Arrow Icon- Double Arrow Icon- Hamburger Icon- TV Icon- Close Icon- Sorted- Hamburger/Search Icon-

Community and Q&A

Indoor air quality and fiberglass insulation

Brian Jackson | Posted in Green Products and Materials on

Hi, two questions if someone can help me out:

1. Is formaldehyde an issue in all types of fiberglass insulation (ie, batts and loose-fill), or just in batts? In other words, if I am doing loose-fill insulation should I look for a formaldehyde free type or is all loose-fill free of formaldehyde? I ask because I see batts advertised as formaldehyde free but not loose fill (for example, the new Owens Corning formaldehyde free line only appears to be for batts).

2. Is there an advantage to using batts over loose-fill for indoor air quality concerns? Just seems like the loose-fill insulation gets everywhere is is more easily disbursed into the air.


GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. User avatar GBA Editor
    Martin Holladay | | #1

    Johns Manville, the best-known manufacturer of formaldehyde-free fiberglass insulation products, makes both fiberglass batts and blown-in fiberglass insulation that the company touts as formaldehyde free.

    Among the products listed in its "formaldehyde-free" brochure is JM Spider, a blown-in product:

    2. If you build your walls and ceilings with attention to air tightness -- something that is certainly important anyway if you want an energy-efficient house -- then there isn't any reason that the fibers in your walls or ceiling will be mixing with your indoor air.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |