DIY Home Improvement Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
95 Posts
Discussion Starter #1
I'm adding a bathroom upstairs, and am trying to find a good place to vent the fart fan. The entire upstairs is a cathedral ceiling that is going to have spray foam insulation - so no roof vents. As such, the soffits are not venting into the non-existant attic space. Is it OK to vent the bathroom into the soffits? The soffits will be perforated.

thanks
 

·
Registered
Joined
·
28 Posts
exhaust fan vents to fit the 4" ducting typical in this application are available that install to the soffit. These vents ensure the exhuast air exits external to the soffit - not into the soffit structure, which given the warm, moist air's propensity to rise would ensure wet and moldy decking and rafter tails. Ice dams would also be a concern if in a northern climate.

Does the cathedral ceiling assembly provide sufficient thickness to pipe the air to a roof penetrating vent?

Vents of both variety are available for inspection at any big box store.
 

·
Registered
Joined
·
2,294 Posts
In some cases a roof vent is easier than a soffit vent! If you have a truss roof you will be OK! However, if you have a stick framed roof, like mine,there's little space to run the pipe between the top wall plate and the roof sheeting!
 

·
Registered User
Joined
·
6,520 Posts
Going through the soffit is fine, but the vent must terminate to outdoor air and must not be just dumped into the soffit itself.
 
1 - 6 of 6 Posts
Top