The question regularly surfaces here – along the lines of:
“I don’t want another hole in my roof, it rains up there, you know; can I route my bathroom fan through the soffit? And just about everyone says “you’ll just get all that moisture sucked up into the attic. So I figured I ‘d get some great pics today – OK, it’s not a bathroom fan, but the radon mitigation system in the pic has been pretty clearly blowing a lot of moisture right under the soffit: View Image I figured – “what a great shot awaits in the attic!” I climbed over tray ceilings and through drifts of cellulose, praying to find rafters blindly underfoot, finally hanging off the edge of a cathedral ceilings framing to get a view of the roof sheathing and framing: and not a mark! Nothin’ No mildew, no mold, no stains! I know one example doesn’t definitively prove anything, but I was sure there’d be evidence of moisture pulled up through the soffit vents!
I don’t know about yours, but my church isn’t a hotel for the holy, it’s a hospital for sinners
Edited 12/3/2004 8:16 pm ET by Bob Walker
Replies
And you were willing to breathe all that radon just to get a picture for us? What a guy!
Al Mollitor, Sharon MA
There are many types of suitable vents for soffit attaching.. they all have back-draft flappers. Side wall installation is also good.
When the force(velocity) of the exiting air comes out of the vent it enters into a very large area (our world) and will be taken away very rapidly.
Some mis-guided individuals still will argue that this exhausted air will come back into the soffit. Maybe a very, very small percentage will. But if the soffit is vented to the roof,s high vents,it will merely exit, thus not entering back into the home.