What Exactly is Attic Rain????
Attic rain occurs when the warm moisture accumulates in the attic, freezes during cold temperatures, then melts when the weather warms again. This see-saw in weather produces the perfect conditions to damage your house. The kicker - it usually affects newer homes because there's less places for air to escape. All it takes is a few holes around fixtures such as bathroom vents and lights that haven't been adequately moisture-sealed to send warm air into the attic. When it melts, you will see circle shaped staining on the ceiling, or water dripping through vents. This moisture can also cause damage in more than one way - soak insulation making it lose it's R-value, mould on roof's sheathing, rafters or trusses.
High efficiency furnaces can also increase the probability of attic rain. High efficiency furnaces remove less moisture from the air in your home than mid efficiency and older model furnaces. This leaves more warm moisture in the air to escape into the attic.
Tips to Avoid Attic Rain
1. Check to see if your attic is well ventilated.
2. Make sure your vents go directly outside and not to your attic.
3. Turn down/off your humidifier or you may need to use a de-humidifer
4. Turn on your kitchen and bathroom exhaust fans while cooking and using the bath/shower