How to Repair Moisture in a Thermopane Door


Thermopane is another name for double-pane or insulated glass, which is common in windows and sliding glass doors. While the doors offer many benefits, such as additional natural light, they also have drawbacks. One problem is that the seals on the doors fail over time, allowing moisture to build up inside the glass. The result is a foggy film on the inside of the thermopane door. Removing the moisture requires drilling holes in the glass to allow it to escape. You'll need a helper for this project.

Things You'll Need

  • Tape measure
  • Dry-erase marker
  • Safety glasses
  • Work gloves
  • Spray bottle
  • Water
  • Garden hose (optional)
  • Drill
  • 3/8-inch diameter drill bit
  • Cloth
  • Plastic caps
  • Stand on the exterior side of the thermopane glass door and measure down approximately 1/2 inch from the top corner and approximately 1/2 inch from the right side. Draw a small mark there using a dry-erase marker.

  • Kneel down and make an identical mark at the lower right corner of the glass door.

  • Put on safety glasses and work gloves to protect yourself from tiny shards of glass.

  • Install a 3/8-inch diameter bit into a drill. Hold the drill up to the top marker location and place it directly on the glass.

  • Squeeze the trigger to begin drilling through the glass. While you do this, ask someone to spray the glass constantly with a bottle of water or to direct a light stream from a garden hose onto the glass. The water prevents the drill bit from overheating.

  • Continue drilling until you feel the bit penetrate the first panel of glass, then stop. Pull the drill bit out of the door.

  • Kneel and drill through the glass door at the bottom mark just as you did at the top.

  • Wipe the glass door to remove all moisture from the outside of the glass.

  • Wait until the internal moisture evaporates from the glass, then insert small plastic caps into each hole to prevent additional moisture penetration.

Tips & Warnings

  • If the moisture does not evaporate, call a professional glass repair company, whose technicians can insert a cleaning solution in the glass to remove moisture from it.

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