Why Is There Condensation in My Attic in Winter?

Attic condensation in winter happens when warm, moist air from inside the house rises into the attic and meets the cold underside of the roof decking. It can look like a roof leak, with damp wood and wet insulation. Better attic ventilation and sealing air leaks from the living space are the usual fixes.

Is It Condensation or a Leak?

Condensation tends to show up as frost or droplets spread across the decking, especially on cold mornings, while a leak usually leaves a defined stain or drip path near a vent, flashing or damaged shingles.

What Causes Attic Condensation?

• Poor attic ventilation.
• Bathroom or dryer vents that empty into the attic.
• Air leaks around attic doors and light fixtures.

How Is It Fixed?

Improving ventilation with roof vents or a ridge vent, and venting bathrooms outside, usually solves it. See signs of attic ventilation problems and what a ridge vent does.

Can Condensation Damage My Roof?

Over time, moisture can rot decking and rust nails. If damage has started, a repair or roof replacement in Myrtle Beach may be needed.