[Greenbuilding] roof venting

[Reuben Deumling]

I've just been reading a bunch about this general subject, in documents
suggested by folks here on this list, and the conclusion I came to was that
above R30 (I think that was the figure), and with careful attention to air
sealing, ventilation can safely be omitted. Now in my case I'm separating
the rafters supporting the roof sheathing (2x6) from the 2x4 purlins to
which the sheet rock is going to be attached, creating a thermal break that
your design only approximates, but someone here can surely speak to how
much those I joists conduct heat and the degree to which that impacts your
overall R-value.

On Sat, Jan 21, 2017 at 10:02 AM, Clarke Olsen <colsen at fairpoint.net> wrote:

> I am building a 750 sqft building with two single plane (shed) roofs,
> using 12" I joists @ 3/12 pitch.
> Can we just stuff that 12" with Roxul, or is ventilation needed?
> Clarke Olsen
> clarkeolsendesign.com
> 373 route 203
> Spencertown, NY 12165
> USA
> 518-392-4640 <(518)%20392-4640>
> colsen at taconic.net
>
>
>
>
>
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