A metal roof "sweats" when condensation forms on the underside. Because metal is generally cooler than the surrounding environment, condensation develops when warm, moist air rises and encounters the coldness of the metal surface. This most often occurs in the early morning or late evening, when the difference in temperature between the roof and the environment is more substantial. Sweating can lead to corrosion, leaks, and water damage. Below, discover a few ways to prevent it.

How to Prevent Condensation on a Metal Roof

1. Minimize Humidity Levels

When the air inside the building is drier, it won't have enough moisture content to sweat on the roof once it rises. You can decrease moisture by minimizing humidity levels inside the structure. Invest in a dehumidifier to draw water from the air, and keep a few windows open at least a crack to keep the air circulating. 

Have an HVAC professional inspect the heating system, clothes dryer, and other heat-producing appliances to confirm that they have clean, clear vents that can efficiently deposit warm air outdoors.

2. Coat the Roof

Metal roofing is prone to sweating because its temperature is below the dewpoint in the air. A roof coating is a thin membrane attached to the surface of the roof to protect it from weather and temperature extremes, creating conditions less conducive to condensation formation. 

Coating the roof will provide a more comfortable indoor environment, better energy efficiency for your HVAC systems, and lower heating and cooling bills.

3. Confirm Proper Ventilation

Adequate ventilation ensures that air can flow freely around the roof, which reduces moisture content and condensation. The right ventilation arrangement will evaporate much of the moisture in the air before it has time to settle and sweat on the roof. 

Make sure all vents are in an open position to encourage healthy airflow, especially those under the eaves and/or along the ridges of the roof.

If sweating has become an issue for your metal roofing, Redeemed Roofing Systems is here to help. Their roofing contractors have more than 20 years of combined industry experience serving the Springfield, MO, area. They provide roof replacements, repairs, and coatings, as well as painting services. Call (417) 773-3952 or visit them online to request an estimate.