ATTIC VENTILATION &
CONDENSATION PROBLEMS

Call us today for a free roof inspection (303) 761-6400

There are 3 major factors that contribute to condensation in your attic:

  1.  Poor Attic Ventilation
  2. Poor Attic Insulation
  3. Whole House Humidifiers and Other Sources of Moisture

Poor attic ventilation will trap the moisture in the attic causing condensation problems. If an attic has excessive condensation, it will start to soak through the dry wall and appear to be a roof leak.

Every winter, Excel Roofing gets a number of calls where a customer thinks they have a roof leak and it’s actually a condensation problem. Our roof repair manager, Dominic, was recently called out to a property where the homeowner thought their roof was leaking.

The homeowner noticed frost in their attic, thought it was a roof leak, and called us to come check it out. Dominic visited the home, inspected the roof, and discovered that in fact it was not a roof leak, but rather a condensation problem in the attic.

Condensation freezing on the underside of the roof decking and the nails.

The condensation soaking through the drywall appears to be a roof leak.

 

There are 3 main contributing factors to condensation problems in the attic.

  1. Poor Attic Ventilation

    • If the attic isn’t properly ventilated, moisture can get trapped causing condensation. If an attic has excessive condensation, it will start to soak through the dry wall and appear to be a roof leak.
  2. Poor Attic Insulation

    • All homes should have at least 20 inches of insulation in the attic. Adequate attic insulation keeps the warm air inside the home from escaping into the cold attic area.
    • If warm air reaches the attic, the cold temperature causes the water vapor in the warm air to condense into liquid water. Keeping the attic fully insulated is key in preventing condensation.
  3. Whole House Humidifiers and Other Sources of Moisture

    • Whole house humidifiers create an increased amount of humidity in the entire house. Other sources of moisture like steam from a shower can also contribute to condensation in the attic. If the attic isn’t properly ventilated and insulated, this humidity can create problems. The humid air in the attic becomes condensation which is evidenced by frost throughout the attic.

This can especially affect us here in Colorado because of the temperature swings that we experience in winter, with freezing temperatures overnight and days that warm up to 50 or 60 degrees. When it starts to warm up outside and the frost in the attic melts, it drips down and appears to be a leak.

Check out these pictures of what condensation in your attic might look like. Don’t let this happen to your home. Make sure your attic is properly ventilated and insulated.

Call Excel Roofing for a free inspection today 303-761-6400

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