How to waterproof a shower

Jas Naylor
View the video

How to waterproof a shower

View the video
×

Project Overview

Applying a waterproof barrier is an essential part of preparing to install a shower. We’ll teach you how to apply the waterproofing and reinforce the joins and gaps in the walls and floor. You will also learn how to prepare and reinforce your surfaces properly. 

Continue to step-by-step instructions

Step by Step Instructions

1 Mark out the area to waterproof around the shower
2 Prepare to waterproof the shower
3 Waterproof the shower walls
4 Waterproof the shower floor
  • Step 1. Mark out the area to waterproof around the shower

    Measure up your wall and mark out where you will be waterproofing. Then mask those lines off with masking tape. A good rule of thumb is to extend your waterproofing 100mm above your water outlet and 100mm wider than the edges of your shower. But check your local council regulations to make sure what is required.
  • Step 2. Prepare to waterproof the shower

    Use a brush to paint primer onto the area you want to waterproof. Use a generous amount on every surface. While you are waiting for the primer to dry, measure the edges, corners and internal joints that need to be waterproofed. Now cut lengths of the reinforcing membrane to cover these areas.
  • Step 3. Waterproof the shower walls

    Paint a coat of waterproofing where your reinforcing membrane will be installed. Then put the membrane on the still wet area. Now apply another coat over the top, flattening the membrane with your brush as you go. To make it easier when putting membrane into recessed corners, cut a nick that lets it split across the different surfaces. Once the membrane is installed, use horizontal strokes to paint a first coat of waterproofing across the walls.
  • Step 4. Waterproof the shower floor

    Install reinforcing membrane where the floor joins the walls and around the drain. Once again, paint the area, then put the membrane down and give it a second coat to flatten it. When your membrane is installed, waterproof the rest of the floor. Once the first coat has dried, give the whole shower cavity a second coat, this time using vertical strokes instead of horizontal ones on the walls.

Tools and Materials

Tools

  • Bucket
  • Paint brush
  • Paint roller
  • Roller tray
  • Safety glasses
  • Scissors
  • Spirit level
  • Tape measure

Materials

  • Masking tape
  • Pencil
  • Primer
  • Reinforcing membrane
  • Rubber gloves
  • Silicone
  • Waterproofing
bathroom

Planning & Projects Six essential tips to renovate your bathroom It may be one of the smallest rooms in your home, but a bathroom that looks great and has a functional design can add considerable value to your home and quality of life.

A clean modern bathroom

Planning & Projects How to organise and declutter your bathroom The trick to a serene bathroom is to declutter. From towel rails and hooks, to shelving and stackable baskets, we have plenty of handy tips and tricks to tidy up your bathroom.

How to choose a bath for your bathroom

Baths, Showers & Toilets How to choose a bath for your bathroom Find tips on how to choose a bath for your bathroom. From choosing a stylish bathtub to one that also suits your whole family’s needs, we’ve outlined everything you need to know in this guide.

Run the silicone smoothly along the surface 01:08

Baths, Showers & Toilets How to apply bathroom sealant Learn how to seal the joins in your bathroom tiles with silicone to prevent moisture getting behind your tiles.

bathroom 04:02

Ideas & Makeovers How to update your bathroom Updating your bathroom can be challenging, but any work you put in will reward you and your family for years to come. The good news is, with just a bit of planning some D.I.Y. know-how, you can transform your bathroom into a relaxing haven without b...

Bathroom 03:03

Ideas & Makeovers How to plan, design and renovate a luxurious bathroom The bathroom should be a place where you feel refreshed and revitalised in. We’ll show you how to design a contemporary bathroom that combines natural light with timber fixtures and fittings to create the ideal retreat in your home. Find out how wit...

grout cleaning tools 01:34

Cleaning D.I.Y. grout cleaning tips and tools Cleaning the grout between tiles can really brighten up a bathroom. We’ll show you how to do it in no time with a few simple techniques.

Bathroom vanity

Vanities, Cabinets & Cupboards How to choose a bathroom vanity unit Here's five simple steps to choose the right bathroom vanity unit to suit your bathroom and your budget.

Health & Safety

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.
Top of the content