I have recently read in Fine Homebuilding and heard elsewhere that fiberglass insulation loses some of its efficiency in “very cold weather”.
1. How cold is very cold? I am insulating a cabin roof about 100 miles north of Toronto Canada, where in January the temperature can go to -40.
2. How much eficiency does it lose, compared to a blown cellulose or Roxul, which is a rock wool product?
3. Can anyone tell me why it would lose efficiency. I have asked people who sell competing types of insulation and they are rather vague about the actual mechanism by which an insulation is one efficiency at one temperature and less efficient at a lower temperature.
Thanks
Bill Bill
Replies
Bill,
Real short on time here at the moment.
Try these threads. I think you'll find what you're looking for.
http://forums.prospero.com/tp-breaktime/messages?msg=37172.1
http://forums.prospero.com/tp-breaktime/messages?msg=838.3
http://forums.prospero.com/tp-breaktime/messages?msg=7458.1
http://forums.prospero.com/tp-breaktime/messages?msg=38001.1
http://forums.taunton.com/tp-breaktime/messages?msg=38437.1