How to Use Low Expanding Foam on a Window Frame

Written by mary lougee
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How to Use Low Expanding Foam on a Window Frame
Insulating window frames lowers heating and cooling bills. (window image by Goran Bogicevic from

The framework around a window has spaces on each side next to the supports. These small spaces allow outside air into a home and create drafts. Hot or cold drafts, depending on the weather outside, creates an environment that makes the air conditioning and heating in a home work harder to maintain a constant temperature. Uninsulated window frames waste electricity in heating and cooling and lead to escalating the cost of comfort in a home.

Skill level:

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Things you need

  • Gloves
  • Safety glasses
  • Low expansion foam sealer
  • Metal scraper

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  1. 1

    Put on safety glasses and gloves for protection.

  2. 2

    Shake the can of low expansion foam sealer to mix the product thoroughly.

  3. 3

    Insert the application tube into the nozzle of the can. Then insert the application tube into the space between the window frame and the wall framework at the top left corner.

  4. 4

    Depress the nozzle to fill the crack about 75-percent full with sealant while moving the applicator down the window frame. Continue this process around the window frame perimeter. The foam will expand a few seconds after spraying in crevices. Let the foam dry completely according to package directions.

  5. 5

    Place a metal scraper at a 45-degree angle to the window frame. Push the scraper around the sealed area to cut off and remove any excess sealer that protrudes from the frame.

Tips and warnings

  • Filling the area around a window frame fully with sealant adds more than the amount needed for insulation when the foam expands. This action wastes product and will create a larger cleanup when scraping the excess off the frame.

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