How To Waterproof A Shower Floor and Wall Before Tiling?

Do you prefer to shower daily? 

Well, I do! 

Actually, two-thirds of Americans prefer to shower everyday and it’s over 80% in Australia. And EPA reports that an average American spends about 8 to 15-minutes to shower

So, only eight minutes a day keeps you fresh and helps to come up with some life-changing ideas!

Yes, you’ve read that right! A study shows that about 72% of people come up with their best ideas while they are daydreaming in the shower. 

Do you want to spoil that precious eight minutes by thinking about water leakage or other unnecessary things?


That’s why you should know how to waterproof a shower floor before tiling. Before starting the waterproofing process, let me inform you the importance of it.

Why Is Waterproofing Before Tiling So Important?

Why Is Waterproofing Before Tiling So Important?

Waterproofing is still one of the most important, yet quite neglected concerns among the homeowners. The reason behind that might be the lack of knowledge about the importance of waterproofing. 

Here are three basic reasons why your shower room needs waterproofing.

1. Protection from water leakage

An average American uses about 17 gallons of water for bathing. This huge amount of water increases the possibility of water leakage. If it seriously starts to leak, it will make the floor slippery and start growing molds, fungi, and other bacteria.

2. Prevents health risks

A non-waterproofed shower room tends to trap the moisture. After a certain time, trapped moisture starts breeding molds, and fungi. These microorganisms will result in serious health problems for everyone using that shower room.

3. Saves your property

Waterproofing shower walls before tiling is far easier than doing it after tiling. Basically, waterproofing after tiling costs you extra bucks, takes lots of time, and definitely a daunting task.

So, it’s better to do it before the tiling. You know, prevention is always better than cure!

Well, we have discussed lots of why’s, let’s proceed to how’s.

How To Waterproof A Shower Floor and Wall Before Tiling

How To Waterproof A Shower Floor and Wall Before Tiling

Contrary to the most popular thought, grouts and tiles are not completely waterproof. You may notice a little bit of moisture is penetrating through it even after using the concrete waterproofing sealers.

Before starting the process, let’s have a look at what you will need in this entire waterproofing process. 

  • A blower
  • Primer
  • Waterproofing membrane
  • Block brush
  • Masking tape
  • A roller and
  • A bucket

Collected everything? Let’s proceed to the step-by-step process of waterproofing the shower room before tiling it.

Step 1: Clean the Surface

Make sure that the shower floor and wall are completely clean before starting the waterproofing process. Using a high-quality blower is more effective to remove the isolated dust. For the stubborn dust, you must clean it manually.

Pro tips: Make sure that the moisture content is less than 5% on the shower surface before starting to waterproof it. 

Step 2: Apply the Primer

Primer helps to hide the seams or joints of drywall. That’s why you should do it at the very first step of waterproofing the bathroom.

Simply prepare the primer on a bucket and paint it onto the surface. You can apply it by using a block brush. Let the coating dry completely before using the silicone.

Step 3: Silicone the Gaps

Apply a 10mm silicone bead in every corner and joints around the floor waste, waste pipe, rose plumbing, and around the tap. It makes the entire shower room leakage and seepage proof.

It is recommended to cover the whole wall while applying the silicone. If you can’t do it for some reason, make sure that you’ve covered at least to the full rose height.

Step 4: Apply the Waterproofing Membrane

Now, apply the first coat of your top rated waterproofing membrane to the wall and floor. Ensure that there are no air bubbles or wrinkles trapped beneath the membrane. Push the membrane into the corners and make sure it covers the entire interface.

Besides that, ensure that your main application overlaps the floor waste and the wall corner by at least 50mm. 

Pro tips: Your waterproofing membrane should be at least 200 millimeters wide to get the best result from it.

Step 5: Add the Finishing Coating

Now apply another heavy coating over the membrane. Make sure that you are applying the coating from a different direction this time. It will completely saturate the membrane before the previously applied coating dries up. 

However, it may take two to three days to dry the surface completely based on the environment. 

Step 6: Testing Phase

After completing the whole waterproofing project, it’s time to test the wall. We will use a thermal camera to detect any leakage or seepage on the wall. 

Simply turn on the camera and scan the whole room. If you don’t notice any circular temperature difference anywhere, the shower has been waterproofed properly.

Final Words

By now, you must be well-aware of the full process of how to waterproof a shower floor before tiling. By waterproofing the shower room, you will not only prevent the damage but also boost the value of your time.

If you have any queries or suggestions regarding this process, feel free to share your thoughts via the comment box.

Have a good day, fellas!

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