How to Prevent Condensation in Ceiling Vents

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Rease, C.L.. How to Prevent Condensation in Ceiling Vents accessed June 21, 2018.


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Crawl into the attic space above the ceiling. Locate the flex duct connecting the grill box to the ductwork. Shine a flashlight along the length of the duct while looking for gaps in the existing insulation. Do not overlook the area where the flex connects to the main duct trunk line.

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Foil-backed fiberglass insulation, 1-inch thick

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InspectAPedia: Heating or Air Conditioning Duct Ice-up, Duct Flood Damage, Duct Water Leaks and Mold

Set the insulation, foil side facing away from the duct, in the gap. Cover the area with metal foil tape to hold the insulation in place.

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Could the AC Unit Cause the Ceiling to Leak?

Problems With a Central Air Conditioners Condensate Drain

Squeeze a tube of silicone caulk to dispense caulk on the bristles of a 2-inch wide paintbrush. Apply the caulk to all four corners of the grill box. Add additional caulk to the brush as needed. Ensure all corners have a 1/16- to 1/8-inch thick coating of silicone. Coat the area where the bottom of the grill box meets the unexposed side of the ceiling material with caulk. Allow the caulk to dry for 24 hours.

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Push the ceiling vent into the vent opening. Align the mounting holes of the vent with the existing holes in the ceiling material. Thread both screws into the flange and tighten them with the screwdriver.


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Rease, C.L.. How to Prevent Condensation in Ceiling Vents.

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Insulate Your Central Air Heating Ducts

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Stop the Air Flow From a Ceiling Air Diffuser

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Leave the air conditioning unit running when doing the repairs.

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Measure the size of any found insulation gaps with a tape measure. Lay a piece of 1-inch thick foil-backed insulation across two or more ceiling rafters with the foil side facing away from the rafters. Cut a piece of insulation to the required size with a sharp insulation knife.

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Caulk all remaining ceiling vents that have issues with condensation.

Condensation Problems in Air Conditioners

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Setup a ladder below the ceiling vent with the greatest amount of condensation.

Rease, C.L.. (n.d.). How to Prevent Condensation in Ceiling Vents.

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How to Prevent Condensation in Ceiling Vents

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Loosen the two screws holding the ceiling vent in place, with a Phillips screwdriver, while keeping one hand on the vent. Lower the vent when both screws are removed.

A sealed and insulated ceiling vent will not produce condensation.

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Move to another piece of flex duct and repeat the process. Make sure no gaps remain in any of the insulation before exiting the attic.

Install a Moisture Barrier on the Ceiling

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Condensation dripping from a ceiling vent can have detrimental effects on the ceiling material surrounding the vent, as well as carpeting and furnishings sitting under the vent. The condensation forms when air of a different temperature meets the grill box and duct connecting the vent to the air conditioning unit. Keeping the temperature of the metal connected to the grill close to the ambient air temperature will eliminate the damaging effects of condensation.


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