"R-30C" insulation

Reply

  #1  
Old 04-13-05, 07:32 PM
dave61
Visiting Guest
Posts: n/a
Question "R-30C" insulation

Anyone have thoughts on the use of this product? The manufacturer claims that it has the same effectiveness as regular R-30 but can be installed in a 7 1/4" space instead of 9 1/4" as in a 2x10 joist. The R-30C batt is supposed to have more fibreglas in it than a regular R-30 batt.

I always thought it was bad to compress fibreglas to make it fit in a smaller space because that would reduce the R value. But it looks as if this is exactly what this product does. If that's the case then why don't I buy R-30 and just scrunch it into the 2x8 joist spaces?

dave
 
Sponsored Links
  #2  
Old 04-14-05, 02:39 AM
Member
Join Date: Mar 2005
Location: Chesapeake, VA
Posts: 340
Sounds great if it works! How's it priced compared to standard fiberglass?There are other insulations out there with very high R-values in a small size; some will give R-30 in as little as 4".
 
  #3  
Old 04-14-05, 09:38 AM
Member
Join Date: Nov 2001
Location: USA
Posts: 1,873
American Society for Testing and Materials (ASTM), is the method that manufacturers use to rate R-value of their products. So regardless of the thickness of the product the method in which the products are tested remain the same. If the product is used other than what it was intended for then the rating does not apply. For example, if you compress the insulations into the cavity, then you would not have the same R-value for either insulation.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes