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How to Install Fiberglass Insulation | This Old House

This Old House host Kevin O’Connor shows how to fill gaps and make a space more cozy and energy efficient. (See below for a shopping list and tools.)

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Kevin works with an insulation contractor to show the proper way to insulate a wall using fiberglass batts.

Shopping List for How to Install Fiberglass Insulation:
unfaced fiberglass insulation [https://amzn.to/2ndascO], used for insulating between wall studs
paper-faced fiberglass insulation [https://amzn.to/2mciKSe], used for insulating between floor joists
low-expansion aerosol foam [https://amzn.to/2lI2S9N], used to insulate around windows and doors
3-mil polyethylene [https://amzn.to/2naEb69], used as a vapor barrier over unfaced insulation
1/4 inch staples [https://amzn.to/2nhTNVG], used to attach polyethylene vapor barrier

Tools for How to Install Fiberglass Insulation:
utility knife [https://amzn.to/2mWQ0gc] hammer tacker [https://amzn.to/2nfnp5R]

Expert installation was performed by Rogers Insulation Specialists [https://www.rogersinsulation.com/].

Kevin and the installer used “EcoTouch” insulation, which is formaldehyde-free and made from 50% recycled content. It is manufactured by Owens Corning [https://www.owenscorning.com/en-us].

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How to Install Fiberglass Insulation | This Old House


  1. "Fill the whole cavity with foam"… yah, make sure there's no capillary break behind the window. 🤦🏼‍♂️. Granted it's an old video, but man, that is not a correct detail.

  2. Serious question – no masks or glasses? Has this stuff changed? I haven't used glass in over 10 years but remember lots of warnings about breathing the stuff and getting it into eyes?

  3. I want to eat the fiberglass for some reason

  4. How do you attach it so it doesn't settle

  5. I usually add way more profanity but I’m proud of you guys. Great video!

  6. Step one don't
    Step 2 use mineral wool

  7. Thank you for this video! I'm getting ready to do my garage. I used to do siding for a living and I've seen the insulation guys do this, just never actually attempted it myself

  8. No Vapor box around the outlet and no acoustical sealant?

  9. Besser erst gar nicht! 0.0 sommerlicher wärmeschutz. Besser schwere Holzfaserdämmung. Oder cellulose einblasdämmung.

  10. Wow! Done correctly. Is it because of the video camera🤔? No camera – no correction? 😢. My new home looks like a hodgepodge patchwork of insulation. 😱

  11. Why fiberglass? Rockwood is better!

  12. Safety first. Wear a respirator and eye protection. Glass fibers in lungs and eyes – not smart.

  13. That poly lining stops the wall from drying inward during humid summers. You should be using something semipermeable like faced fiberglass or just painted drywall.

  14. Why is the redheaded guy so CLUELESS in every video! He has to TAUGHT EVERYTHING!

  15. Where you tuck in to the side of the outlet I am wondering if you'd get a better R-value from removing that excess. In other words, more air pockets vs that tucking creating too much compression on the fiberglass.

  16. No respirator when handling fiberglass insulation?

  17. All you KNOW IT ALLS , he wasn't wearing the mask while filming this short clip. Why don't you worry about yourselves! "Omg no mask " 😭

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