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Posted by Abby Normal on June 24, 2007, 2:03 pm
> Abby Normal wrote:
> > 82F at about 55% is not exactly condusive to mold. So far this attic
> > is unconditioned, I will most likely condition it slightly, will try
> > about 40 to 60 CFM of supply/return in the attic, a volume of about
> > 4000 cubic feet. This should drop the attic average temp to perhaps
> > 81F and keep RH under 50%.
>
> > Every do a commercial building with a flat roof deck, insulation on
> > top? Maybe some T-bar below bar joists. Open return your this ceiling
> > space or 'attic void' is now a plenum, ducted return it is an
> > unconditioned space similar to what I have done to my attic.
>
> > Seeing no need to turn an attic into a solar collector, ventilated
> > with humid air.
>
>
> >>What about building expiration [ventilation] to prevent mold and dry rot?
>
> >>--
> >>Zyp
>
>
>
> >>>Some of you guys in here know me, know the kind of climate I am in.
>
> >>>Anyways I built a place with a sealed attic, keeps the heat out in the
> >>>first place, seems to have really minimized infiltration. Holding 40%
> >>>RH in a real humid climate without a dehumidifier. Any of you want
> >>>some details of my opinion of the sealed attic, email me
>
> >>>Attic is pretty bearable to be in, first test run the temps peaked at
> >>>less than 85 F, averaged about 82 degrees, RH up there in mid 50s. I
> >>>think my second round of tests will have it doing better than that.- Hide
quoted text -
>
> >>- Show quoted text -
>
> Hmmm,
> Then that's not sealed!- Hide quoted text -
>
> - Show quoted text -
ambient dewpoint hovers around 80, concrete, some moisture wicks
through I am sure. Pretty confident infiltration be extremely low,
comparable to a sealed vapour barrier in a northern climate
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