Confused!! Should we vent bath fan through roof, soffit, gable end?
Our house is built of thick masonry block. NOT fun to drill through! It's a one-story ranch in Maine, so we have cold snowy winters and humid summers.
We need to replace a bathroom exhaust fan before we have blown-in insulation installed in the attic this winter. Here are our choices... given our location and parameters below, which do you guys think is best?
1) Through the roof. It would be about a 10' run of pipe and would have to cant at about a 45 degree angle (ie not straight up) to place the roof cap on the back side of the ridge where it wont be horribly obvious. We already have a veritable forest of roof protrusions back there: range hood fan, two plumbing vents, wood stove chimney, and solatube dome.
2) Through the soffit. Exterior wall is only 3' away from fan location and eaves are more than 12" wide. But I have heard this is not a great solution re: moisture re-entering attic.
3) Through the gable end wall of the attic (which is wood, not masonry). This however is a ~19' run of pipe.
If you can also advise what type ducting to use, that would be great. If it's # 2 or #3 and is buried under a foot of blown-in insulation, do we need to use insulated pipe? Where does on buy insulated pipe anyway?
Thank you so much!!!