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Posted by z on June 19, 2008, 11:38 am
da4b@m3g2000hsc.googlegroups.com:
>
>
>
>
>
> > On Jun 17, 12:08=A0pm, trad...@optonline.net wrote:
>
> >> > innews:4856aa0b$0$30
> > 156$4c368...@roadrunner.com:
>
> >> > > =A0 =A0 Different areas of the world get different results and cer=
tai
> > nly
> >> > > different vents (inlets) make for differences in results.
>
> >> > > =A0 =A0 Frankly I have not found that power vents are of much if a=
ny
> > use.
> >> > > Proper generous static venting seems to work just as well without
> >> > > noise and electricity. =A0The worse situations I have seen is when
> >> > > po
> > wer
> >> > > vents end up disrupting the natural flow and can even increase
> >> > > the temperature.
>
> >> > > =A0 =A0 The real differences I have seen is poorly vented areas.
>
> >> > > =A0 =A0 Overall yours does not seem to be bad.
>
> >> > > =A0 =A0 If you really want to do something make sure it has inlets=
gr
> > eater
> >> > > =A0 =A0 than
> >> > > the minimum required and that thefanis not short circuiting the
> >> > > natural air flow.
>
> >> > or sucking the AC out of the house via access, vents (stupidly)
> >> > terminating in theattic, etc.
>
> >> > >com
> > .
> >> > > ..
> >> > >> got a remote reading thermometer and stashed it in theatticto
> >> > >> see what's happening. now i'm wondering what i should expect.
>
> >> > >> normalish 50 year old ranch house, connecticut. 1500 sq feet
> >> > >> more or less. old central AC, not particularly powerful or
> >> > >> efficient. normal amount of insulation, i.e. less than would be
> >> > >> optimum but normal for the period. powered ventfan, mushroom
> >> > >> style. soffit vents, gable vents, etc.
>
> >> > >> on the wise advice proferred here last year, i upped the temp on
> >> > >> the thermostat for the ventfanfrom 80 degree to about 100 IIRC.
>
> >> > >> OK; so during the final months of =A0winter, when i had the
> >> > >> thermometer, there was a maximum of about 20 degrees difference
> >> > >> between the house and theattic.
>
> >> > >> lately, when it's warm, often 20 degrees difference, obviously
> >> > >> in th
> > e
> >> > >> opposite direction. during a hot spell last week, when it was
> >> > >> 90+ outside,atticgot up to 120; house got up to 87 (AC off
> >> > >> during daytime).
>
> >> > >> so, is this reasonable/expected for poweredatticvent? would
> >> > >> bigger
> >> > >>fando better?- Hide quoted text -
>
> >> > - Show quoted text -- Hide quoted text -
>
> >> > - Show quoted text -
>
> >> He doesn't say what the temp was outside during the final days of
> >> winter, but if the temp diff between theatticand the house was only
> >> 20 deg, I hope it was not very cold outside, as that means theattic
> >> was at about 50 deg. =A0 =A0If it was cold outside, =A0I'd expect a mu=
ch
> >> bigger temp difference between theatticand the inside of the
> >> house.
>
> >> Probably the best thing that could be done here is to increase the
> >> amount ofatticinsulation. =A0 That will do a lot more to keepattic
> >> heat out of the house than installing a biggerfan. =A0 Plus you get
> >> benefit not only in summer, but also with reduced heat loss in the
> >> winter.
>
> >> I also second the advice to make sure there is adequate intake
> >> opening, ie soffit, gable, etc. =A0 If there isn't, you not only reduc=
e
> >> the cooling capaciyt, but you can be sucking air from inside the
> >> house through any gaps, openings around fixtures, etc.- Hide quoted
> >> text -
>
> >> - Show quoted text -
>
> > i was afraid you'd say something like that. is installing more
> > insulation as big a PIA as it looks? to make it worse, the previous
> > dwellers laid plywood over the joists to provide flooring for storage.
> > at least they didn't bother to fasten it down.
> > the previous dwellers laid plywood over the joists
>
> This comment may be a whole new ballgame you know.
>
> If the insulation was any thicker than the ceiling joists/bottom truss
> chord and they put plywood over it and compressed it, they have reduced
> the r-factor of your attic insulation. Insulation works because of the
> air within it. Depending on how much it was crushed depends on how much
> it reduced it.
>
> Were there areas of no plywood? What's the insulation scoop there?- Hide =
quoted text -
>
> - Show quoted text -
yeah, i thought of that, but as far as i can tell, the insulation just
was installed up to the top of the joists, maybe on purpose so they
could use storage space. i think i'll store my collection of valuable
antique paraffin wax sculptures and vinyl records up there.
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