RE: SB: Venting cathedral ceiling/roof insulated with cellulose?

["Gladish Family" <gladish@cnw.com>]

> >...whether or not to vent the cathedral ceiling/roof ...that will
> >be insulated with dense-packed cellulose.
>
> Whitney & Tristan;
>
> Theoretically, you should not need to vent the ceiling/roof if
> the interior air
> barrier at the ceiling is perfectly air-tight.

Tom, I built my house using (possibly) poor advice to wit: a cathedral
ceiling is simply a tilted wall. Why is this type of  ventilation such a
huge issue on tilted walls and not an issue on vertical ones? Is there a
critical degree of tilt at which it goes from being a problem to not a
problem? So far I don't see clearly what dramatic change takes place in
condensation potential as a wall goes from sticking straight out of the
earth to lying above it.

Thanks for your input- the ceiling isn't insulated yet, I still have time to
figure something else out.

Andy G.


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