Moisture food and warmth.
Mold in attic from bathroom vent.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
It is important to have a balanced ventilation system using equal amounts incoming and outgoing air.
Symptoms to watch for.
The symptoms may vary from person to person and can also depend on the length of exposure and the amount of spores inhaled.
Eventually this mold can develop into wood rot.
Are exhaust fans required for a bathroom.
First and foremost the fan must be ducted to the exterior not to the attic.
If you eliminate just one of these elements mold will starve and die.
Bathroom ventilation done right fortunately there are several ways to make sure the bath fan is used properly to evacuate moist air.
A greater danger is posed by bathroom fans that vent directly into the attic or soffit areas rather than directly outside.
Mold needs 3 things to grow.
Telltale black mold stains typically result from this ventilation error.
Black mold in your air vents can cause a variety of unpleasant symptoms and health problems.
Attics usually have a passive ventilation system in which outside air comes in through the soffit eave vents at the bottom warms up in the attic and escapes through the can or ridge vents at the top because hot air rises.
Common symptoms and health problems caused by black mold may include.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
Not all building jurisdictions require bathrooms to have an exhaust fan if the bathroom has an openable window that has 1 5 square foot of open area when open.
In many cases moisture from bathroom fans is the primary source of attic mold infestation.
Dryer vents plumbing vents kitchen or bathroom fans vented into the attic.