2 bathroom exhaust fans vented together, mold problem
bcon268
17 days ago
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Bathroom exhaust fan installation in the north
Comments (2)Good that you realize the soffit issue with an exhaust vent. Either block off the soffit on each side from above, or could you possibly replace some of the vented soffit from below with solid material? There are higher quality roof vent hoods available. Fantech or American-Aldes are two sources that I've used. A roof vent can be added without damaging the integrity of the roof, just pay attention to the details and work carefully. Are the prevailing winds in your favor to limit snow accumulation in the proposed location? While your at it, consider adding a fan timer at the wall switch to insure the required ventilation time it takes to remove all the bath moisture....See More? about venting bathroom exhaust fan
Comments (1)I'm not an expert, but from what I've read, you're right, that's not going to be enough. If you haven't already, why don't you ask on some of the GW building forums also to improve your chances of getting this answered before the contractor gets there tomorrow :) Here is some info I've saved from our master bath remodel. Hope you find it helpful. If not, maybe someone else will :) Monica Venting exhaust If he is venting the exhaust into the attic air space, that's bad. Even if there are attic vents (normally gable wall louvered vent panels, or a combination of soffit and ridge vents) in the attic that allow air to move through the space. If he has the end of the duct just pointing at the attic gable vent, that's no good either. The goal is to get the moist air outside the house, not to dump it directly in the attic, or dump it near the gable vent, where air currents can keep the moist air in the attic. If he is bringing the duct up into the attic, then continuing the duct laterally and running the duct out through the gable wall and installing a vent cap out there, then that's a good thing. I prefer the vent to be rigid metal instead of the flex duct, and I prefer the lateral run to be sloped slightly lower as it runs towards the gable wall. I use aluminum tape to tape all seams in the duct, taping both the seam that runs the length of each piece of duct as well as around the circumference where two pieces are joined together. This way if there is any condensate in the duct it runs out the vent instead of pooling and/or running back down into the fan. It's a small, but important detail. Personally, I prefer as few holes in the roof as possible. Mongo Rigid ducts are fairly easy to slope, they just need periodic support along the horizontal run. In a attic it can either be hangers coming down off the rafters, or wood scabbed to the floor joists running up vertically. Oooooh. I didn't think of a brick house. Brick can be more difficult, but it is done. Still with brick, it might actually be easier to go out the roof, but hopefully only if it's on the back side of the house. I'm not certain if venting to the outside is required by code in your area, you could give your local building department a call. If it is a code requirement (it is in my locale), then it should have been included in the scope of the work. After all, he should bid the job and complete it to code, right? Then again, I wouldn't want a ticked off contractor cutting a hole in my brick wall or in my roof while angry and while trying to do it on the cheap....See Morebathroom exhaust vents
Comments (13)Personally I think the fewer penetrations through a roof the better. I also don't see anything inherently wrong with venting two bath fans through a single roof opening. Even if both are on at once, probably the worst thing that will happen is that they back pressure each other and they don't vent quite as efficiently. Both of my bath fans are vented through the same soffit vent....See MoreVenting 2 bathroom fans
Comments (3)You may want to crosspost this in Heating and A/C, there's a lot of HVAC folks there who can confirm, but I looked into this (we are also in Wisconsin) when we were adding a fan to our master bath and it was a no-go because of backdraft, iirc. Can't remember if it was against state building code or just not recommended. We ended up just running it straight up through the roof - just do (or have done) a proper installation with the right materials and you shouldn't have any leaks....See Morebcon268
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