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.


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