Replacing Expanding Foam Sealant

An expanding foam sealant.
  • 2-4 hours
  • Intermediate
  • 5-1,000
What You'll Need
Expanding foam sealant
Putty knife
Utility knife
Vacuum cleaner
Protective clothing
Protective eyeglasses
Face mask
Working gloves

An expanding foam sealant is very useful for sealing off cracks on your walls or as attic insulator. Replacing your expanding foam sealant is not difficult, but it can be a bit messy, especially if you use the sealant to insulate your attic. To help you replace expanding foam sealant, here is what you should do.

Step 1 - Find the Areas that Need Sealant Replacement

If you are using expanding foam sealant to cover the holes and cracks in your home, you need not replace all the expanding foam sealant when doing repairs. Instead of replacing all the sealants, simply locate cracks and leaks that need new sealants and work on them. On the other hand, if you use expanding foam sealants as insulation, you may need to replace everything to create more efficient insulation.

Step 2 - Remove the Old Expanding Foam Sealant

Before you can put on new expanding foam sealant, you should remove the old one completely. To do this, put on your protective garments, face mask, and protective eyeglasses to keep tiny particles from getting into your mouth, nostrils, and eyes. Use a putty knife to scrape off the sealant from the surface. Take care not to drive the blade of the putty knife too hard on the surface to avoid causing damage.

If you used the sealant to insulate your attic, it may take some time to remove all of it, so be patient. When removing the expanding foam sealant from your attic walls and ceiling, start at the far end of the attic and then work your way to the center. Make sure that you scrap every bit of sealant from the surface of your attic. After removing the sealant, vacuum the area to remove the debris. If you cannot get all the sealant at one time, do not worry. Just clean off the sealant that you removed for the day and then continue your work some other time. Just make sure that you finish all the work before you begin to apply the new expanding foam sealant. Note that once you open a can of expanding foam sealant you need to use the entire can within the same day, so make sure that everything is ready before you open the can.

Step 3 - Apply the New Expanding Foam Sealant

To apply the expanding foam sealant to cracks and holes in your home, use the applicator that comes with the sealant. On the other hand, if you buy a sealant spray can, simply point the spray can to the areas that need to be sealed and then squeeze the trigger to release the foam. You may use your putty knife to stick the sealant firmly into the crack or hole. If you use the sealant as an insulator, simply spray the sealant evenly on the surface and let it dry.