Sealed Attic

What about building expiration [ventilation] to prevent mold and dry rot?

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.

See> What about building expiration [ventilation] to prevent mold and dry rot? >

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Hmmm, Then that's not sealed!

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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

so how do you keep the heat from the sun on the roof out of the attic?

Mark

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 styrofoam also.

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

No insulation directly above the sheet rock?

Must be nice! :-)

No insulation above the sheet rock, the insulation is on top of the roof. White metal roofing reflects a lot of heat away, and the insulation limits how much makes it in in the first place.

I doubt I am even getting a natural air change rate of 0.10 per hour from infiltration. Bring on the pot lights