Blown Cellulose and humidity


Old 01-04-10, 12:15 PM
Thread Starter
Join Date: Nov 2005
Location: USA
Posts: 22
Question Blown Cellulose and humidity

I am considering upgrading the insulation in the exterior walls of an older home built when code requirements for insulation were poor to non-existent. Removing and replacing the existing sheet rock is not an option.

Blown cellulose appears to be a great option, but I have concerns about how it will perform in our humid Southeast region of the US. Can anyone fill me in? I have read conflicting opinions on the 'net.

Sponsored Links
Old 01-04-10, 03:59 PM
Thread Starter
Join Date: Nov 2005
Location: USA
Posts: 22
Thanks for the response. According to the BSC climate zone map, I am in zone 4, though whether 4a or 4b is not clear. In any event, for blown cellulose insulation, BSC recommends that no interior vapor barrier is needed for zones 1 through 4b. This is due to the density of blown cellulose and the inhibiting effect on air movement in the wall. So it looks like I can blow it into the wall and not worry about the presence of a vapor barrier.

Oh, on second glance at the climate zone map I see I am in zone 4A, Moist.

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