7 Causes of Attic Mold

An attic playroom.

Attic mold can grow unnoticed because most homeowners do not access this area of the house too often. It is a good practice to conduct regular checks in your attic to rule out moisture problems and mold. If left unchecked, mold can bring down the value of your property and cost you a lot of money in repairs. Some of the main causes of attic mold are described below.

1. Inadequate Insulation around Fixtures

If the fixtures on your ceiling are not properly sealed and insulated at the edges, warm air from your home can easily rise up to the attic. This leads to severe energy loss, as well as moisture problems in the attic. As the warm air rises, it meets the cold surface of the attic walls, where it condenses. Over time, mold and mildew start growing on the floors and walls of the attic.

2. Dryer Vents that Discharge into the Attic

In some homes, dryer vents are installed in such a way that they discharge into the attic. This is never a good option because the dryer releases all the hot air and moisture into the attic. This can very quickly lead to moisture problems and also constitute a fire hazard because of the accumulation of lint.

3. Kitchen and Bathroom Vents Exhausting into the Attic

Similar to the dryer vent, a vent from the kitchen and bathroom must never be exhausted into the attic. All such vent outputs must be directed outside the house, either through the roof or to the ground. Kitchens and bathrooms produce a lot of warm, humid air, which is removed with the use of vents and exhaust fans. If this air is let out into the attic, it forms a wet film over the floors and walls of the attic, where mold can gain a foothold very easily.

4. Different Attic Vent Types

You must ensure correct ventilation in your attic so that air is removed efficiently out of the attic space. Ensure that the attic vents in your attic are all the same type. Using different types of vents can result in trapped air in the attic, because the less efficient vent types end up taking air inside the attic, lowering the efficiency of the entire venting system.

5. Leak in the Roof

A leaking roof can contribute to attic mold in a major way. Even if your roof is somewhat new, chances of a leak can increase after the roof is disturbed in any way for work around that area. Each time it rains or snows, water accumulates in your attic, degrading the structure of the building and also leading to the formation of mold in the attic.

6. Missing Attic Floor Insulation

The attic floor must be properly insulated to avoid drafts and moisture that escape from your living space and rise up to the attic.

7. Inadequate Sealing around a Whole House Fan

Whole house fans are installed in the ceiling. The area around the fan must be thoroughly sealed to ensure maximum efficiency and also to prevent the accumulation of warm air in the attic.