How to Water Seal a 2nd Floor Tiled Bathroom

Updated April 17, 2017

Sealing a tiled bathroom, on whichever floor it may be, is an important task. It prevents moisture working its way behind tiles which will, in turn, cause them to become loose and possibly detach from the wall. In addition, sealing prevents moisture seeping between walls and fixtures such as baths and sinks potentially causing damage. Sealing your tiled bathroom from water is a relativity simple, if time-consuming, task.

Use a damp, clean sponge to clean the tiles in your bathroom.

Select a waterproof tile grout in the appropriate colour for your bathroom.

Mix and stir the waterproof tile grout with water until it is the consistency of toothpaste.

Use a grout spreader to push grout between the tiles in your bathroom. Ensure that all gaps between the tiles are filled.

Smooth the grout with a blunt edged stick, or your finger, before wiping away any excess grout on the tiles with a clean, damp sponge.

Wait for 48 hours, or according to the manufacturer's instructions, before exposing the grout to water.

Clean the gap to be sealed of any dirt or debris using a clean, damp sponge. Also, cut away any old silicon sealer with a sharp utility knife.

Load a silicon sealer cartridge into your silicon gun, according to the manufacturer's directions, and cut the top off the applicator nozzle with a utility knife. This allows silicon to exit the cartridge.

Run the nozzle of the silicon cartridge along the gap between your fixture and the wall. Pump the silicon gun as you go. Use as smooth an action as is possible so as to apply the silicon sealer regularly and evenly.

Apply a small amount of dishwashing liquid to your finger before running it along the silicon seal to ensure a smooth finish. The dishwashing liquid prevents the silicon from sticking to your finger and will easily wash off. In addition, use a clean, damp sponge to clean the fixture and wall of any excess silicon sealer.

Wait 48 hours, or according to the manufacturer's instructions, before exposing the silicon to water.


Use a penetrating or membrane forming grout sealer for extra protection, or if you were unable to acquire waterproof grout. Wait for 48 hours for the grout to dry thoroughly before applying this. Manufactures instructions for penetrating or membrane forming grout sealer vary, but in most instances you will apply the sealer directly to the grout with a small brush.


Smooth grout immediately after applying as it sets very hard and may be impossible to smooth if you delay.

Things You'll Need

  • Clean sponges
  • Waterproof tile grout
  • Grout spreader
  • Blunt-edged stick
  • Utility knife
  • Silicon sealer cartridge
  • Silicon sealer gun
  • Dish washing liquid
  • Penetrating or membrane forming grout sealer
  • Small brush
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About the Author

Based in rural Andalusia, Spain, Joel Barnard has been teaching English and writing travel-related articles since 1999. His articles have appeared in "Travel and Food" magazine, "Backpacker Essentials" magazine and a number of travel websites. He holds a Bachelor of Arts with honors in sociology and comparative Western societies from East London University.