How to Fix Ceiling Condensation

Condensation on your ceilings is a symptom of a much bigger problem. An improperly insulated roof will throw off the temperature balance in your home and cause ceiling condensation. This buildup of moisture will continue to get worse as it begins to degrade the drywall in the ceiling. This is why you must clean the ceiling and insulate the roof and ceiling joists to remove the problem. This double-edged fix will regulate your home's temperature, lower your heating and cooling bills, and extend the life of your ceiling.

Ceiling condensation is a sign of improper insulation.
  1. Fill the hopper of your spray rig with loose, spray insulation fibers and binder as per the manufacturer's instructions. Enter the attic area dragging the nozzle of the spray hose with you. Spray the insulation in a sideways motion to coat the inside of the roof with the fibers.

  2. Unroll pieces of R-19 insulation. Lay a strip of roll insulation in the space between each rafter with the paper side face-up. Cut the insulation with shears to fit.

  3. Mix a cap full of bleach to 2 gallons of water in a plastic bucket. Dip a rag into the bucket and wring it out so that it will not drip. Wipe the ceiling with the bleach water-soaked rag to kill any mold or mildew present. Wait for an hour then wipe the ceiling with clean, dry rags to remove any remaining moisture.

  4. Squeeze the trigger of your caulk gun loaded with construction adhesive and drag the tip of the tube across the back of a piece of foam panel insulation. Apply several beads of adhesive to the back of each panel then press them onto the ceiling. Cut the foam insulation panels with a utility knife as necessary. Cover the entire ceiling with the panels.

  5. Cover the foam panels on the ceiling with 1/4-inch drywall. Drive drywall screws through the drywall, then the foam and into the existing ceiling. Countersink each of the screw heads with a power drill. Cover the seams between the boards with self-adhesive mesh tape. Cover the screw heads and mesh tape with drywall compound. Let the compound dry overnight then sand each seam and screw head smooth.


  • Work gloves and safety glasses are required when using hand tools.
  • A respirator, a disposable protective suit and a face shield are required in addition to your gloves and glasses when working with insulation of any type.

About the Author

After learning electronics in the U.S. Navy in the 1980s, Danny Donahue spent a lifetime in the construction industry. He has worked with some of the finest construction talent in the Southeastern United States. Donahue has been a freelance writer since 2008, focusing his efforts on his beloved construction projects.