When homeowners find moisture in their attic, they often assume it is due to a roof leak. Sometimes they are correct, but other times the moisture is actually condensation, not a leak. While condensation is not as urgent a matter as a roof leak, it is not something you want to ignore. Any moisture in your attic, regardless of the source, can lead to mold and deterioration.
Keep reading, and you’ll discover how to tell the difference between condensation and a roof leak. You’ll also learn what to do if you discover condensation in your own attic.
Signs of Moisture in the Attic
Condensation and roof leaks do cause some of the same problems in an attic. You may notice the insulation feels moist to the touch. There may even be some mold or mildew on the insulation. If you look up at the attic ceiling or framing members, you may notice spots that are soft or rotten. Sometimes, a musty odor is the first thing that clues homeowners into the problem.
If you notice these signs, you definitely have moisture in your attic. The next step is to determine whether it’s condensation or if it’s coming from a leak.
Condensation Versus Leaks
One key way to tell whether you have condensation or a leak is to pay attention to when the moisture appears. If the moisture appears during or after a rain storm, it’s probably due to a leak. On the other hand, condensation tends to show up during the winter months or a cold spell. Warm, moist air makes its way into the attic, usually from the home below. The air then cools inside the colder attic space. Cold air cannot hold onto as much water vapor, so some of the water settles out of the air. It lands on surfaces, and you see it as condensation.
If you have attic windows, it’s pretty easy to tell the difference between condensation and a roof leak. If condensation is to blame, you’ll generally see some fog or water on the window glass. Roof leaks don’t make windows wet unless the leak just happens to be above the window.
Also, pay attention to how widespread the moisture is. If a few key parts of your insulation are wet, this is evidence of a roof leak – or leaks. If most of the insulation or surfaces in your attic seem damp, this is evidence of condensation.
Finally, take a look at your roof from the outside. Do you see any lifted shingles, missing flashing, or damaged vents which could be leading to a leak? The absence of these signs does not 100% mean you don’t have a roof leak, but it is one data point to consider. Also, check whether you see any ice dams along the edge of the roof. Ice dams often appear when an attic lacks insulation or ventilation. These same conditions make attic condensation more likely.
Addressing Roof Leaks
If you examine the evidence and decide it’s likely you have a roof leak, contact a roofing contractor ASAP. They can come identify the source of the leak and make the required repairs. Do not attempt to climb on the roof yourself. Roofers have the safety equipment and training to do this safely.
Addressing Attic Condensation
If you suspect the moisture you’re seeing is actually condensation, you should still call a roofing company. The need is not as urgent as with a roof leak, but don’t wait too long. The longer the condensation is left to linger, the more mold will grow.
Your roofer can take steps to reduce the formation of condensation in the future. Often, they add some extra vents to your roof. Depending on your roof’s layout and existing vent system, they may add a couple more soffit vents or a ridge vent. Improved ventilation will increase airflow through the attic so any water vapor can dissipate before it condenses out of the air.
Your roofer may also add more insulation to your attic. In the winter, this can help prevent warm, moist air from traveling up into the attic in the winter. They may seal any gaps or cracks between your attic and your second story for the same reason.
Occasionally, attic condensation may be caused by an exhaust fan that was incorrectly vented into the attic. If your roofer discovers this problem, they may advise you to have an HVAC professional come reroute your exhaust fan to properly vent outside.
Roof leaks and condensation can both lead to rot and mold growth in your attic, but they are addressed in different ways. If you notice any type of moisture in your attic, contact Bill West Roofing in Lee’s Summit, MO. The experts at our company offer high-quality roofing services, including roof repairs and vent installation.