Quote:
Originally Posted by bennelson
That would only happen IF you have a very poorly sealed ceiling AND really insufficient attic venting.
Air flow takes the path of least resistance. Houses like mine will have vents on the underside of the roof overhang. That's how air gets into the attic. Air going out the ridge vent, end vent, or powered attic vent, comes IN through these vents on the bottom of the overhang.
Obviously, start with the "low-hanging fruit". As a general disclaimer on all home projects - start with the easy and cheap stuff - caulking, weatherstripping, and insulation.
If your powered attic vent is working so hard that it's sucking air out of conditioned space, you have worse problems!
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Hi,
Not sure that's true.
I've read elsewhere that air movement from the living space to the attic space is the single largest source of infiltration/ex filtration in a lot of homes.
I'll try to find that reference.
I know when I added insulation to my attic I first pushed the old insulation out of the way and sealed every penetration for wires, plumbing, vents, can lights etc. -- there were lots of them
All those little holes add up, and even if most of the flow out the fan is coming from the attic vents it seems like it would not take a lot of flow of conditioned living space air to offset the benefits of the attic fan?
Maybe someone can find some measurements on real attics?
Gary