How to Stop Condensation on an Aluminum Door Threshold

Condensation on a threshold can cause mildew to grow.

When cold air comes into contact with humid hot air, water present in the air condensates on metal and glass, such as an aluminum door threshold. Weatherstripping on doors is designed to keep out air and prevent moisture from condensing on door thresholds. As your aluminum door threshold wears down over time, it creates a small gap at the bottom of a shut door, it can cause condensation to occur. You can stop condensation from forming on your aluminum door threshold by installing a door sweep onto the bottom of the door, which creates at air tight seal when the door is shut.

Remove the old caulk on the aluminum door threshold where it meets the doorjambs, finished floor and around the front of the door with a putty knife or utility knife.

Scrape off any remaining caulk or residue with a razor blade.

Measure the length of the bottom of your door. Transfer the measurement to the door sweep with a felt tipped pen.

Set the door sweep on a steady, flat work surface with the edge that needs to be cut hanging off the side. Clamp the door sweep to your work surface with a C-clamp to ensure that it remains steady while you cut it.

Cut the neoprene or rubber flap of the door sweep to size with a utility knife.

Cut the metal flange, or the top strip of the door sweep with nail holes, to size with a hacksaw.

Close the door. Hold the metal flange of the door sweep up against the door, positioned so that the bottom edge of the flap of the sweep comes into contact with the aluminum threshold. Mark the screw holes onto the door with a pencil.

Drill pilot holes on the screw marks with a drill and a 3/32-inch drill bit.

Hold the metal flange of the door sweep on the bottom of the door and align the screw holes with the pilot holes. Drive the provided screws into the screw holes and the door with an electric screwdriver.

Things You Will Need

  • Putty knife
  • Utility knife
  • Razor blade
  • Measuring tape
  • Neoprene or rubber door sweep
  • Felt tipped pen
  • C-clamp
  • Hacksaw
  • Pencil
  • Drill
  • 3/32-inch drill bit
  • Electric screwdriver


Condensation on a threshold can cause mildew to grow.


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  • Fits walls 4-3/4 to 7-1/4 inches thick; measures 12-3/4 by 18-3/4 inches; flap measures 10 by 15 inches

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  • Avatar niner_72601 Partially replace my existing cabinets?
    Jan 21, 2007 by niner_72601 | Posted in Decorating & Remodeling

    I have cabinets in my kitchen that are painted.......i want to go oak face frame and doors...............can i pull off the existing face frame, and replace with an oak question is......whats the best way to build the frame......dowels?

    • The face frames may be a beotch to replace; they were built on the cabinet boxes, or glued to them. Just depends on the construction. The best way is to use pocket screws. There is an angled hole (pocket) drilled into th …e fancy machine).

      Otherwise, you just apply the boards individually to the cabinet box and pin the edge that hangs down with a finish nail (not the best method, but it's done on built in shelves everyday).