The air-conditioning ducts in the crawlspace under my four-year-old home sweat so badly during the summer that small puddles form on the ground below them. How can this be prevented?
First, take steps to reduce the moisture buildup within the crawlspace. If there is an exposed-earth floor, cover it with a vapor barrier such as 4- or 6-mil polyethylene sheets with edges overlapped and taped together. Tape the sheets to the foundation wall. Look for leaks in plumbing pipes, and repair them. Also, make sure that the gutters are clean so that water won’t overflow and seep into the crawlspace. Finally, check to see if the dryer vent discharges moist air into the crawlspace. After taking steps to reduce moisture vapor, you must also insulate the ducts and seal the insulation with a vapor harrier. The surface temperature of the ducts is below the dew point of the air in the crawlspace. Insulating the ducts without covering the insulation with a vapor barrier won’t prevent condensation from forming on the ducts. By covering the insulation with a vapor barrier, such as polyethylene sheets with sealed joints, you can prevent the moisture in the air from coming in contact wit
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