How to Seal Pergo

Pergo laminate flooring is durable and water-resistant material. The ease of cleaning and stylish detail make this type of floor covering popular. To completely protect the underlayment from water penetration, areas that surround pipes and butt up against sinks and cupboards will need to be sealed. A flexible, mold-resistant silicone is the perfect choice to ensure moisture will not penetrate the subfloor or weaken the Pergo. An hour of sealing will save future repairs or replacement that cost both time and money.

Pergo laminate flooring mimics the look of natural wood.
  1. Locate all expansion areas in laminate flooring that need sealed. Mark them on a floor diagram or place a bright piece of fluorescent masking tape at their locations.
  2. Load a caulking gun with a tube of mildew-resistant silicone caulk. Do this by sliding the tube into the caulking gun with the pointed end facing the front. Cut the end of the tip open with a utility knife at a 45 degree angle.
  3. Squeeze the trigger on the caulking gun until the silicone begins to exit the open end of the tube. Practice squeezing a line of caulk on a disposable piece of cardboard. This will help you develop a feel for use of the caulking gun.
  4. Fill the areas around pipes with the silicone. Squeeze the trigger gently until the opening is filled on all sides. Dip your fingers in water and run them over the silicone to smooth the surface.
  5. Place the caulking tube tip flat against expansion areas that butt up against permanent surfaces, such as walls, doorways or affixed appliances. Apply a straight line along the entire length. Smooth this out using wet fingers. Allow 24 to 36 hours for the silicone to dry.

Things You Will Need

  • Floor diagram
  • Fluorescent masking tape
  • Mold-resistant silicone caulking
  • Utility knife
  • Caulking gun
  • Disposable cardboard


  • Practice using the caulking gun before attempting this project.
  • Every area that water can penetrate must be sealed. Pergo states, "The expansion spaces, all expansion spaces, between the Pergo flooring and walls, the doorway transition or other fixed objects such as pipes for radiators, sinks, water supply to water closet or toilet flanges MUST be sealed with Pergo sealant or 100 percent mildew-resistant silicone."


  • Wear safety glasses and a ventilator mask when using silicone.
  • Keep the area well ventilated from the fumes.

Photo Credits

  • texture of wooden floor - can be used as background image by Elnur from Fotolia.com