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Blown Cellulose and humidity


westone's Avatar
Member

Join Date: Nov 2005
Posts: 22
NC

01-04-10, 12:15 PM   #1  
Blown Cellulose and humidity

Hi,
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.

Thanks,
Bill

 
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westone's Avatar
Member

Join Date: Nov 2005
Posts: 22
NC

01-04-10, 03:59 PM   #3  
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.

 
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