On Wed, 23 Jul 2008 02:20:33 GMT, Erma1ina
wrote:
http://en.allexperts.com/q/Roofing-1598/eave-vents.htm
If there are no eave overhangs, I recommend that you don't add eave
vents. Even if you're able to install them between the rafters, with no
eaves, the rain and snow will blow into the vents.

What you can do, if you have an open attic (as opposed to cathedral
style ceilings) is to install some eyebrow style attic vents in the
roof, down low, near the edge of the roof. Putting a few of those vents
down low on each side of the house will accomplish the same thing as
regular eave vents. I recommend installing one vent every 10' to 15'
along the bottom edge of the roof.

I hope that helps. Feel free to follow up in the future.


Thanks. I do currently have 9 pot vents distributed between three
elevations. Two high and two low on both sides of the house and on the
back there's one near the top. Are pots that much less efficient than
eyebrows? I also have a thermostat-controlled exhaust fan smack in the
center of the X made by four of those aforementioned vents. I found
this mentioned in many places:

***
When attic fans remove more air than is drawn in by soffit vents, the
vacuum created in the attic can draw air from the house rather than
the outside.
***

I believe that may be the problem, and while half of those pot vents
were installed low in an attempt to overcome the lack of soffit vents,
I just don't think it's enough, hence my moisture problem. Last winter
was bad and I had ice dams in a few places, one in the vicinity of the
kitchen exhaust fan. Coincidence? Feh.

Between 3 teens showering innumerable times daily in a one-bathroom
house, gas appliances and heat, plus a huge vent-free gas fireplace in
the basement... we produce a ton of moisture. Heck, evaporation from
the bath towels alone is frightening!

I've totally bought into the need-for-ventilation thing -- just not
sure how to best accomplish it in my soffitless home.

~JMA