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

["Tim Chamberlain" <spike@supersat2.net>]

Hi Tristan

The information that I have gathered concerning roof venting is if there is
space above the insulation, then the roof needs to be vented. But if the
space is completely filled, as what you are doing, then no venting is
nessary. It is essentially a wall that is tipped about 45 degrees.

Tim Chamberlain
NW Idaho

----- Original Message -----
From: "Whitney Burgess & Tristan Kelley" <raven@tetontel.com>
To: <strawbale@crest.org>; <greenbuilding@crest.org>
Sent: Tuesday, May 14, 2002 9:22 AM
Subject: SB: Venting cathedral ceiling/roof insulated with cellulose?


> Greetings! from a guy who needs to make up his mind on whether or not to
> vent the cathedral ceiling/roof of a strawbale in-filled house that will
> be insulated with dense-packed cellulose.  I've found conflicting
> information regarding the necessity of venting when dealing with
> cellulose.  One theory is that no additional vapor barrier or venting is
> necessary, due to the fact that there is no "bulk air movement" through
> the cellulose due to it's high density, thus very little moist air to
> condense with in the roof?  Others warn of mold and other nasty problems
> associated with not venting (soffit vent to ridge vent) the dense-packed
> cellulose roof?  The "crew" is finishing the fascia (thus decision time)
> and since flipping a coin seemed a little too arbitrary a
> decision-making technique, I am requesting any insight you fine folks on
> the strawbale and greenbuilding listserv might have into my ventilation
> dilemma!
>
> Details:
> roof rafters are 11 7/8inch  I-Joists
> sheetrock on underside of rafters
> 5/8 CDX sheathing on roof deck
> 10 in 12 roof pitch
> 26 gauge corrugated metal roofing
> cold weather, snow country environment
> location: SE Idaho, USA
>
> Thanks!
> Tristan
>
>
>
>
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