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.
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.
White metal roofing, on top of foam insulation, on top of the roof.
About R7, looking a lot more effective at keeping the heat out than a
lot of fibreglass does agaionst superheated air.
Gable end attic walls are insulated on the inside with 1.5 inches of
My second round of tests right now, figure the attic is going to
average about 80F. But involved my lowering the temperature in the
home down from 79 to 75.
Sheet rock ceiling is presently separting the unconditioned attic from
the space below.
The location is a year round cooling environment, humid
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.