How to reseal double pane windows

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How to reseal double pane windows
Reseal a double-pane window to ensure proper insulation. (window image by hava from

A double-pane window holds certain advantages over traditional windows. It is composed of two sheets of glass separated by less than an inch of space that is vacuum-sealed to prevent heat loss and condensation and even to muffle street noise. The glass panels of a double-pane window share a single frame that requires a proper sealant for further insulation. A silicone caulk can accomplish this effectively if the existing seal becomes damaged or worn over time.

Skill level:

Things you need

  • Caulk remover
  • Utility knife
  • Putty knife
  • Scissors
  • Silicone caulk
  • Stiff wire
  • Caulking gun
  • Craft stick

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  1. 1

    Dissolve the existing sealant using a commercial caulk remover. Apply the solvent according to manufacturer's instructions, then allow it to soften the old seal for the amount of time indicated on the product label.

  2. 2

    Cut the treated sealant with a utility knife to loosen it from around the window frame. Pry it from the seams with a putty knife to remove it completely.

  3. 3

    Use scissors to cut the tip off a cartridge of silicone caulk. The resulting opening should be no larger than 1/4-inch wide, the standard size for a bead of caulk. Puncture the seal within the nozzle using a thin, stiff object.

  4. 4

    Load the cartridge into a caulking gun and apply a bead of the silicone into a joint in the window frame, where it meets the wall. Squeeze the trigger steadily and draw the tip of the gun across the seam until it is evenly filled.

  5. 5

    Quickly glide a wooden craft stick over the freshly applied silicone for a neater seal. The caulk will dry overnight, or after a full 24-hour period.

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