Due to very low roof pitch I can only vent upstairs bath exhaust fan
through the roof. Can someone give me advise and point to online
resources what type of roof vent is best and most of all how to put it
to prevent roof leaking. Are their any code requirements of how far
from roof edge/VW vent must roof exaust vent be?
In some areas, it is permissable to vent through the soffit under the
roof. - don't know if you soffit is available since it has such a low
pitch. How about through a wall on a higher portion of the roof?
Each time you penetrate a roof, it is another opportunity for a leak -
particularly with low pitch roofs.
I explained in my original posting that due to low pitch roof I cannot
vent through soffit. The only other option I see for venting bath
exhaust fan is through the roof. I just don't know what type of vent to
Your local home improvent store will have roof vents that you can use.
No real special ones to use. The better ones are most likely stainless
or aluminum and will last a long time. Others may be galvanized steel.
In any case make sure to use some good insulated flex duct when doing
this job. This may prevent condensation from building up in the colder
months of the year. Cutting open the roof isnt really fun (hate doing
it myself) Just make sure that you seal it all up nicely. Next rain
storm, take a look at your work and see if its dry.
Hope you ran the panasonic on a GFCI circuit too. Its code for most
bathroom installations (at least over the shower ones, but anywhere in
the bathroom really makes more sense (water + electric = ouch))
I would also recommend a timed switch for the unit. (I used them in my
home) Its nice just to press a button for 10 or 20 or 30 min. and
forget about shutting off the fan.
I bought mine from Menards. Just an alum hood with damper (they'll show you
what to buy and how to install. Lowe's is good too.)
Drilled a 1/4" hole from the attic side as to where I wanted the vent hood,
pushed a pencil through it so I could find it easier.
Took a wrecking bar and pulled up several shingles, cut the hole and laid it
in the hole loose. Replaced the shingles while cutting the profile (I used
roofing cement but probably would not have had to). Secured the hood when
refastening the shingles.
Spray-painted the hood brown to match the roof. (I painted all the vent
hoods brown to match the roof and stink pipes black just because.) Plumbing
vents (PVC) have remained painted more than 20 years so far.
Used alum rigid ducting from the fan to the hood's collar (could have used
alum flex. - do NOT use cheap stuff like plastic.) Straight runs, straight
out, no dips or traps.
Did not insulate, never had a single problem with condensation. Winter
design temp is +3 deg around here, so I imagine I would have seen something
in the last few years by now.
Took about 2-1/2 hours.
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