How to Reduce Moisture in the Attic

insulated attic to prevent moisture

The accumulation of moisture in attics can occur in a variety of ways and create several different problems. These problems include accelerated deterioration of roofing materials, dry/wet rot and the growth of mildew, as well as toxic mold. Here are 4 ways to reduce humidity levels in this space.

1) Do regular inspections for small leaks – Smaller leaks can provide a consistent source of moisture in an attic while going undetected in the living areas of the home. The most common sources of these types of leaks are the cutouts for the chimney, ducts and air vents. On the exterior, these cutouts are protected by metal flashing, but deterioration and damage can result in small pathways for water to enter the attic. Besides checking the cutouts, look for any water stains on the ceiling and the sidewalls. Any leaks that are present should be repaired as quickly as possible.

2) Make sure that the kitchen, bathroom and dryer vent to the outdoors – Steam and warm air emissions that are funneled to the attic from the interior can increase the temperature and humidity in the space, creating an ideal environment for fostering the growth of mildew and toxic mold. If ducts from the interior end in the attic, extend them so their emissions can be vented to the outside of the building.

3) Ventilate the space – Adding adequate flow through the space can allow for humidity to be vented out with warm air. This can reduce moisture as well as the temperature in the attic, which can make it far more difficult for mold and mildew to gain a foothold in the space. Ventilating this space can also reduce heat that radiates up through the roof and down into the living areas of the home.

4) Insulating the attic floor and entry points – Insulation brings several benefits by limiting the transfer of heat. In many environments, warm air also carries moisture and unrestricted upward movement can result in an attic that is both hot and humid. With insulation on the attic floor restricting the transfer of heat into the space, the warm air stays in the home’s living areas. This also lowers the demand for heat, resulting in lowering energy bills.

By taking these steps, homeowners can drastically reduce both humidity and temperatures in the attic. In addition to preventing or limiting the growth of mold and mildew, controlling the environment in this space can slow the deterioration of roofing materials, block dry/wet rot, reduce the demand level on climate control systems and lower monthly energy bills. If there is enough room, the controlled environment may allow the attic to be converted into a space that can be used as a home office, an extra bedroom or a play area.