Questions on installing a bathroom vent on a Mansard Roof

GaryGday

Hello,

New to the forum and this is my first post.

Going to be installing a bathroom exhaust fan in my bathroom on the 2nd floor of my two story. (currently doesn't have one, new install)
My house has a Mansard style roof so even though I will be venting out the side of my house it will be going through the "roof" (shingles etc...)

I have a friend/electrician installing it with me but just wondering if there are any recommendations or warnings to look out for?

- position on the fan in bathroom ceiling?
- flex pipe ok to vent? 4"?
- roof cap, sealing etc..

Appreciate any input. I have attached a pic to this post, it's not the correct side of the house but the roof and window will give you an idea. Thanks!

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Windows on Wash

Same methods that would be employed for the box vent on a standard pitch will apply here as well.

Be sure to insulate the duct run from the fan.

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GaryGday

Thanks for the reply. So use flexible insulated ducting?

roofnron

You would much better off to use rigid pipe. Insulate the pipe. Then slightly slope the pipe toward the roof outlet so if condensation forms in the pipe, and it will, the water will drip outside.

There are such things as backfeed dampers also that can be installed in line of the pipe to keep cold air from blowing in to the bathroom through the pipe.

This goes without saying but minimize elbows and distance.

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