We bought a house in Northern Arctic Minnesota last summer. After outrageous propane consumption this last winter I decided to check out the insulation in the attic. This summer a leak developed and drywall ended up in our bedroom. After realizing that there was no access to the attic, I made a hole in the gable and found extreme heat. We have since replaced the roofing and a ridge vent. I also have installed a thermostatically controlled fan in the gable. While up there I found that there was only one layer of fiberglass batting... It was white?? Never seen the white stuff before. It has R-30 marked on it and 10".. It has settled to around 7"...

Anyhow, the recommended R-value for our region is R-49 to R-60... The local lumber yard has a great sale on "Blowing Wool Insulation". Retail $35 down to $19 with rebate and sale. So, I picked up 30 bags.I am considering blowing in at an R-30 value over the R-30 batting that is already in there. Should give me the recommended R-60.

I am an amateur and am thinking about getting someone with experience to blow it in. However, if it is a no-brainer, I would like to do it myself.??

Also, I was wondering if I have to do anything special around the soffits/vents (perforated for venting) inside?

There is an older part of the house (early 1900s) with about 7 inches of blown-in cellulose. Can I just blow in some of the wool over it?

Thanks for any advice...

  • Have you considered that the attic might not be the only place you need to insulate? I'd check for heat/air leaks with a thermal camera (or have someone do that for you) well before buying any insulation if I were in your shoes Oct 8, 2018 at 0:30
  • It's easy, just don't block the soffit vents. I made cardboard channels and just slid them down to the vents. Jan 18, 2020 at 1:19

1 Answer 1


My house had the white ( fiberglas ) blown in 20 years ago. It was a nasty job with full coveralls ,mask, headcover and a trailer mounted blower unit. How would you do it ? I had covered some soffits with pieces foam board an supposedly the operator tried not to cover the rest.

  • I'm not quite getting it. Do you mean you would be used like 1 inch foam board to create like a chimney up each of the channels so that the blown in insulation doesn't cover them up?
    – Russ
    Oct 7, 2018 at 16:45
  • 1
    I wedged the foam vertically between rafters to stop the fiberglas from going onto the soffit to plug the vent screen. Oct 8, 2018 at 2:46

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.