How to Trim Out a Shower Window

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Adding trim to a shower window is a waterproofing technique that protects the wall and windows and adds a decorative touch at the same time. For areas that are exposed to high amounts of water, such as the shower, PVC trim is recommended. PVC trim is a hard plastic that does not absorb water like wood trim does.

When installing trim around a shower window use PVC trim.

Things You Will Need

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  • Tape measure
  • PVC wall trim, 3 inches by 6 feet
  • Constructive adhesive
  • Handsaw
  • Straightedge
  • Painters tape
  • Clean silicone caulk
  • Caulk gun
  • Utility knife
  • Rubber glove
  • Paper towel

Maintaining PVC trim is also much easier to do than maintaining wood trim.

  • Measure the length and width of the shower window and cut two sections of 3-inch PVC trim so that it is 6 inches wider than the window. For example, if the window measure 24 inches wide, you will cut two sections of trim that measure 30 inches each.

  • Measure the height of the shower window and cut two sections of 3-inch PVC trim to 6 inches longer than the height of the window. For example, if the window measures 30 inches high, you will cut two sections of trim that measure 36 inches each.

  • Lay the four cut sections of PVC trim horizontally on a flat surface. Separate them into one group for height and one group for width.

  • Measure 3 inches in from each corner on each section of trim. Mark the 3 inch measurement along the top edge of the trim.

  • Draw a line back to the bottom corner from the 3-inch mark on each end of each section of trim. Use the straight edge as a guide to draw straight on the line.

  • Cut along the lines using the hand saw until both ends are angled on all four sections of PVC trim. This will create four trapezoidal strips of trim.

  • Apply construction adhesive to the back side of the left side trim section. Press the trim onto the shower wall, lining up the 3-inch mark on each end of the trim with the corners of the window.

  • Apply construction adhesive to the back side of the right side trim section. Press the trim onto the shower wall, lining up the 3-inch mark on each end of the trim with the corners of the window.

  • Apply construction adhesive to the back side of the top trim section. Press the trim onto the shower wall, lining up the 3-inch mark on each end of the trim with the corners of the window.

  • Apply construction adhesive to the back side of the bottom trim section. Press the trim onto the shower wall, lining up the 3-inch mark on each end of the trim with the corners of the window.

  • Tape the center length area of each section of trim using painters tape to hold the trim to the wall. The tape should be 6 inches or longer and will overhang onto the window and the wall. Remove tape in two-to-three hours, once adhesive has dried completely.

  • Apply clear silicone caulking around the top and bottom of the trim by applying it to the crevices around the trim. Rub to a smooth finish using a rubber glove. Remove caulking from the glove with paper towel and continue to smooth the caulking until it forms a waterproof seal around the trim.

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