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Posted by Harold Kestenholz - Hydronic Network on November 12th, 2000 11:32 PM
In reply to Attic Ventilation & Moisture Problem by Paul in Colorado on November 12th, 2000 09:26 PM [Go to top of thread]

Moisture in attic air is a complex problem. Permitting free movement of air through the attic at night also permits the moisture in the air to condense on the cold wood surfaces. When the sun rises to warm the attic, frost converts to moisture. If air is warm enough to absorb the moisture, it dries the wet surfaces.

If the air is not able to dry the surfaces, the droplets collect to soak insulation and ceilings. If you see no evidence of wet insualtion and ceilings, the mosture is frosting and drying on the cold surfaces in the attic, so nothing more needs to be done.

Air is a gas, so moisture spreads to a somewhat common relative humidity throughout the whole attic even though only portions receive a direct breeze. Humidity in a local area spreads out throughout the attic as long as some of the air exchanges. You seem to have more than enough vents.

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