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
A-Z of bathroom renovation terms

Planning & Projects A-Z of bathroom renovation terms There’s lots to know when planning your bathroom renovation—from planning through to styling. To help, we’ve put together a list of common terms you might hear during your renovation.

bathroom

Planning & Projects Bathroom makeovers on a budget There are a number of simple, low cost things you can do to improve 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.

0301LeakingShower03summary 01:50

Baths, Showers & Toilets How to fix a leaking shower A quick and simple way to stop water leaking out the sides of your shower screen.

040110RemoveMouldheadersummary 00:50

Cleaning How to get rid of mould Removing mould from your bathroom is easier than you think. You just need the right products and a bit of elbow grease.

tile niche 04:50

Tiling How to install a bathroom tile niche Learn how to install a tile niche and make your bathroom clutter free.

bathroom lighting

Planning & Projects How to light your bathroom Lighting a bathroom can be a challenge—they are especially prone to shadows and reflective surfaces. But the good news is there’s a vibrant range to choose from, including pendants, downlights, diffuse ceiling lights, sconces, under-cabinet lighting...

wooden towel ladder 02:50

Planning & Projects How to make a wooden towel ladder This stylish wooden towel ladder will add a touch of class to your home. It’s easy to make and is the perfect way to display rugs, scarves, throws or hang towels to dry. It’s ideal to move from room to room, wherever you need hanging space.

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