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Dugams 08-28-2012 12:21 AM

Bathroom exhaust through roof
First of all, sorry if I'm not using the right terminology. I will try my best to explain my situation.

I recently bought a house and so far I've found a bunch of things that haven't been maintained properly. So I decided to go rooting around in the attic to check up on the exhaust system. So I have been to the attic but not on the roof (scared to climb up there I guess).

So I was trying to figure out what exhaust duct belongs to what bathroom. I found out that the downstairs shower fan duct goes up in to the attic. I made a mental note where it goes through the roof and went outside of my house. Right at the spot where I expect to have the fan duct come out I see what looks like a static vent.

So my question is.. is it possible that the shower exhaust fan duct is attached to a static vent? Not to a exhaust vent. There are a few exhaust vents on my roof that are way different looking than this. This looks like a square black thing, just like the other static vents that are on other parts of my roof. Again I have not been up to my roof but looking from down below it looks just like all the other static vents.

So is it possible that some moron had connected an exhaust fan duct to a static vent instead of exhaust vent and if so is it bad bad bad?

Thanks again and sorry for my wording. I am a girl without any technical terms for things.. I just root around a lot and try to figure out things. LOL.

Windows on Wash 08-28-2012 01:12 AM

Post up a picture.

I think we are garbling our term here.

By static vent, do you mean plumbing vent (i.e. PVC/cast iron pipe through the roof)?

That would not be the proper way to vent a bathroom fan. Plumbing...yes.

Dugams 08-28-2012 11:00 AM

2 Attachment(s)
OK, sorry for the lack of right terminology. I have attached 2 pictures. They are not the best but hopefully good enough to give an idea. I will bust out the real camera (not cell phone) if needed to though. In the first picture I have 2 exhaust vents and then a plumbing vent. I think all is good with that.

The second picture is the static vent in question. I am pretty sure the bathroom exhaust fan duct work is attached to this square looking vent.

Does that clarify it at all? Thanks!!

Windows on Wash 08-28-2012 01:16 PM

How is the attic vented in this case?

The two vents pictured with the plumbing vent are likely vent fans.

Dugams 08-28-2012 01:27 PM

There are several soffit vents to draw air into the attic. Also, there are 5 more of those square vents (picture 2) along the ridge of the roof. I thoughy they were for attic venting as well. The two vents by the plumbing vent are exhaust vents (picture 1). The fan from the laundry room is hooked up to one, the guest bath fan to the other.

Windows on Wash 08-28-2012 02:01 PM

Get some larger pictures of the roof line. Depending on the size of the roof, that ventilation does not appear to be adequate nor should a fan for a bathroom be dumped at a roof vent.

They should be vented directly through the roof deck to outside.

Dugams 08-28-2012 04:03 PM

I took a few more photos. I hope this give a better idea.

There are a bunch of small (baseball size) soffit vets running along the bottom of the roof.

The attic does get very hot and I do think myself that there might not be enough ventilation.

Please also note that I live in Seattle. So lots of rain except in the summer. It's been a warm and dry summer.

Bought the house recently, home inspector didn't notice anything wrong with the attic. But he did miss a few other things so who knows..

Windows on Wash 08-28-2012 05:41 PM

That size attic, I am going to guess (despite the vast amount of perforations) that you don't have a balance system.

What roofer was possessed to put that system together.

I am also not a fan of having that high (i.e. basically straddling the ridge beam) on the roof either.

Wouldn't be the first time an inspector missed something.

Dugams 08-28-2012 06:27 PM

I forgot to mention that the attic is only under part of that roof. Basically if you look at the first picture and extend that red line on the right hand side where I labelled 'soffit vents' directly across the picture all the way to the left you get an idea where the attic runs. The large area of roof that comes down in the middle of the picture w/ skylight does not have attic.

Windows on Wash 08-28-2012 06:39 PM

It does not have an attic, but it is vented.

Dugams 08-28-2012 06:44 PM

Yes, there are soffit vents

Windows on Wash 08-28-2012 07:40 PM


Originally Posted by Dugams (Post 998611)
Yes, there are soffit vents


My point being that there appears to be much more intake than exhaust.

Dugams 08-28-2012 08:16 PM

So question is.. Put more static vents, solar fan, electic fan or something else. I think we already established that the shower fan exhaust is wrong. How hard is it to change the static vent to exhaust vent? Do I call roofer or a duct guy? Thanks.

Dugams 08-28-2012 08:41 PM

Oh and thanks for helping me out!

Windows on Wash 08-28-2012 09:35 PM


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