First sorry for the delay in the response, got caught up with work and life, haven't had time to work on projects.
mics_54, I have done a bit of research, however, I will admit you are the first person to tell me that the bird blocks are their to keep the rafters straight. It's a good thing I don't"jump" into projects too quick, otherwise that would have been a big mistake.
I do have a bit of a problem I cant seem to figure out. My plan is to blow cellulose into my attic, and provide airflow via a new ridge vent and soffit vents. But I am not 100% sure on how much airflow I need to provide from my soffit vents to keep the cellulose dry. Here is what I have figured out:
I read through the 2006 International Building Code and briefly through the Connecticut 2005 Building code addendum. These are the only things I found regarding soffit vents/ridgevents:
The ratio regarding (airflow) to (attic area) of 1:300 sq.in. with a vapor barrier or 1:150 without a vapor barrier. I plan on just blowing in cellulose (no vapor barrier), Here are my calculations:
Attic Area: 1140sq.ft (~26x40ft + a 100 extra) #2
NFVA for my attic: 91.2sq.in (1140ft x 12in/150sq.in)
Something saying Ventilation should be balanced as close to 50% at the top of the roof and 50% at the bottom. I plan on installing this ridge vent
, which provides 13.5 NFVA per ft. Installed on my home that would provide about 486sq.in NFVA (36ft x 13.5sq.in-ft)
That would provide almost 5x the NFVA that I need. This was one of the lowest NFVA ridge vents I found. I don't think the extra airflow will "hurt" anything, but I have no way of knowing this. So thats my first problem, my second problem. If I am supposed to balance the airflow 50/50 from the ridge to the soffit, I would have to cute some seriously big holes in the birdblocks... And now that I know what their purpose is, I'm not sure what sort of opening to make in them. I would ideally like to screen the opening so no bugs go in the attic, as a small portion of the attic is used for storage.
Any thoughts? Thanks for your time in advance