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How to seal a shower tray

Updated February 21, 2017

Certain shower stalls and inserts contain trays that prevent water from leaking onto the bathroom floor. They are most commonly constructed of fibreglass and serve as a slightly concave foundation for the shower unit. Sealing a shower tray is essential for filling exposed seams and gaps where water can escape. Silicone caulk is the most effective airtight and water-resistant sealant for bathroom fixtures such as a shower tray.

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  1. Open the doors and windows nearby to ventilate the bathroom, then put on a pair of latex gloves. Limited workspace calls for optimal circulation when using chemicals.

  2. Clean the exposed gaps in the shower tray, using a household bathroom cleaner that does not contain ammonia. Spray or pour the solution onto these areas to remove any visible build-up, then wipe it clean with a dry rag.

  3. Cut off the tip on a cartridge of silicone caulk, using scissors. Create an opening that will dispense a bead of caulk 1/4 inch wide or less, then puncture the foil seal within the tip with a stiff wire.

  4. Load the tube into a caulking gun. Align the tip with a joint between the shower tray and the shower wall. Squeeze the trigger and apply a bead of silicone caulk, drawing the tip of the gun along the seam.

  5. Moisten your index finger with a damp cloth and glide it across the seal to smooth it evenly. You can also use a craft stick or the back of a plastic spoon. Allow the caulk to cure 24 hours before running the bath water.

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Things You'll Need

  • Latex gloves
  • Bathroom cleaner
  • Rag
  • Scissors
  • Silicone caulk
  • Stiff wire
  • Caulking gun
  • Cloth

About the Author

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