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What is Attic Ventilation?Attic Ventilation is necessary to allow moisture to be exhausted from the attic to the outside. If allowed to collect in the attic, moisture will do serious damage to the wooden framing members, and will decrease the effectiveness of your attic insulation. Attic Ventilation will also exhaust hot air to the outside, which keeps the home's living spaces cooler and prolong the life of wood and shingles. Using ridge vents to ventilate your attic lowers heating bills in the winter by maintaining proper airflow and removing attic humidity. Ridge vents allow the insulation to keep its maximum R-value, or insulating ability, which would otherwise be significantly reduced because of condensation. Ridge venting also helps with cooling by removing the summer heat, preventing it from radiating into the rooms below. Properly installed, ridge vents work on the natural passive movement of air from a cool location to a warm one. For the typical attic, this means a combination of low vents along the eaves of the roof, and high vents along roof's ridge. Since the air in the attic is warmer at the ridge than it is at the eaves, the natural upward movement of air from cool to warm creates a current -- lower temperature air is drawn in through the low vents, pushing the higher temperature air out the high vents. While the movement of air is more dramatic in the summer when attic temperature differentials are higher, this movement actually occurs at all times and in all temperatures. More reading about Attic Ventilation
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