My attic has a humidity problem that caused a lot of mold to grow on the
north side of the roof deck (underside.) I had the mold chemically treated
but need to get the humidity source taken care of.
Previous owners of the house had two full baths with showers vented to the
attic. The vent pipe terminates into the bottom of a passive roof vent but
I don't think its actually getting out of the attic. Is there a proper
method for venting this humid air?
I'm told this roof is known as a "hip" roof?? I don't have any soffet
venting - Just four vents near the top of the roof.
Thanks for any advice.
It needs to go out of the home....period.
You can do it with a soffit vent, a roof vent, or a side vent. Each shower
fan requires its own vent termination, and since you dont have soffits, you
can go right up to the rooftop, and use a proper vent stack with it.
If the run total equals more than 14 feet on either fan, that fan will need
to be ran in hard pipe.
Can you use a plumbing vent, or does the vent have to be just for the
bathroom exahust fan? I have a similar problem except I don't have any
mold. The house was built with a cedar roof so the attic had plenty of
ventalation. Now it has a composition roof and there's no place for the
bathroom humity to go. Therefore, we never use the exhast fans.
It must vent in a separate pipe; it must not use an existing plumbing vent
pipe. The plumbing vent pipe is specifically sized for the existing number
and type of plumbing fixtures.
Even if it is a short run < 14' I recommend using a hard pipe and a roof
vent with a damper and bird screen.
On Wed, 24 Nov 2004 08:26:43 -0500, "Steve@carolinabreezehvac"
Good advice, once I had a plugged up sink. So the harware guy sold me
this divice, it inflated in the pipe and pulsated water at the clog.
Well I inserted it, and turned on the water, the water flowed(in this
case 'pulsated') and flowed and flowed. We couldn't figure why the
water kept going. Well then we got our clue. I sounded like it was
raining due to our noise rain gutters. That's when the light bulb
went on, we ran outside to find that water was 'pulsating' out the top
of the plumbing vent.
Now in hindsight of that incident, and the question about tying the
bathroom vent into the plumbing vent, good idea NOT to. We would have
pumped water into that drain till the water came running down the
stairs. We were newbies. ;)
tom @ CarFleaMarket.com
OK Thanks. So I'm clear, are you saying it can blow into a roof vent? My
concern is that not all of it blows out but eddies back into the attic. I
was wondering wether there is a type of roof vent designed for exhaust like
this to make a tight fit and keep rain out.
Also, you say each vent requires it's own vent termination - The exhausts
are run with hard pipe but come together in the middle of the attic to form
a single exhaust. This is incorrect? Should I change it?
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