How do you tell if attic is properly vented?

How do you tell if attic is properly vented?
How to determine whether you need better attic ventilation

Look at your eaves and roof.
Touch your ceiling on a warm, sunny day.
Thick ridges of ice on your eaves in winter are a sign of poor attic ventilation.
Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing.

How to determine whether you need better attic ventilation
  1. Look at your eaves and roof.
  2. Touch your ceiling on a warm, sunny day.
  3. Thick ridges of ice on your eaves in winter are a sign of poor attic ventilation.
  4. Warm air that escapes living space also carries moisture that will condense on rafters or roof sheathing.