How to Waterproof a Cinder Block Pool: Reap This 6 Amazing Benefits

Are you concerned about the safety and longevity of your cinder block pool? If so, waterproofing is a must.

How to Waterproof a Cinder Block Pool

Waterproofing can help protect your pool from water damage and extend its lifespan. It’s an easy process that anyone can do with the right materials and tools.

In this guide, we will provide step-by-step instructions on how to waterproof a cinder block pool so you can enjoy it for years to come! So let’s get started.

6 Benefits of Waterproofing a Cinder Block Pool:

1. Extra Protection Against Water Damage

Waterproofing provides a barrier between your cinder block pool and water, preventing moisture from seeping into the cracks. This helps protect against deterioration and other forms of water damage. It also helps to prevent algae and mildew from forming.

2. Longer Lifespan

Adding a waterproof coating will help to extend the life of your cinder block pool. It makes it more resistant to wear and tear and other forms of damage. If the pool is maintained, waterproofing can extend its lifespan by many more years.

3. Easier to Maintain

Waterproofing makes it easier to keep your cinder block pool clean and debris-free. It also helps reduce the time you’ll need to spend on maintenance, saving you time and money.

4. Improved Appearance

Waterproofing can help improve your pool’s overall look, making it more aesthetically pleasing. It also helps reduce the amount of dirt and grime that will accumulate on the surface, giving you a cleaner, brighter pool perfect for swimming in.

5. Prevents the Growth of Mold and Mildew

Mold and mildew can cause structural damage to your cinder block pool.

Prevents the Growth of Mold and Mildew

Waterproofing prevents water from seeping into the cracks, thus preventing these organisms from growing and spreading. If your pool develops mold or mildew, waterproofing can help prevent it from spreading further.

6. Easier Cleaning

When you waterproof your cinder block pool, it makes it much easier to clean. You don’t have to worry about water seeping into the cracks, making reaching certain areas hard. Waterproofing eliminates this issue and makes cleaning a breeze.

Now that you know the benefits of waterproofing your cinder block pool, let’s move on to the steps.

How to Waterproof a Cinder Block Pool: 6 Steps Guide

Step 1: Gather supplies.

Before you start waterproofing your cinder block pool, make sure you have all of the necessary supplies. You will need waterproof sealant, a roller, a brush, and a mask to protect you from fumes.

Step 2: Prepare the pool.

Before applying any sealant, you must prepare the surface of your cinder block pool. Start by cleaning the area with a pressure washer or scrub brush to remove any dirt and debris clinging to the sides.

Step 3: Apply sealant.

Now it’s time to apply the waterproof sealant. Start at one end of your pool and use a roller or brush to apply the sealant in an even layer. Make sure you cover all exposed surfaces, including corners and crevices.

Step 4: Apply a flex seal on the edges of the pool.

You can also apply flex sealant to the pool’s edges for extra protection and flexibility. This will ensure no water can seep through those areas, even over time.

Apply a Flex Seal on the Edges of the Pool

You can also use flex sealant to fill in any cracks or gaps that may have been missed during the initial waterproofing process.

Step 5: Let the sealants dry.

Once you’ve finished applying the sealants, let them sit for about 24 hours before adding water to your pool. This will give the sealants time to cure and form a protective barrier around your cinder block pool. If the sealants are applied properly, your pool should be waterproof for up to 10 years.

Step 6: Use a Latex-based thin coat.

If you want an extra layer of protection, use a latex-based thin coat to cover the surface of your cinder block pool.

This will help to protect the sealant from any UV rays or other elements that may cause it to break down over time. You can use a top coat like Drylok Extreme when you need to make repairs or add an extra layer of protection.

And that’s it! With these steps, you can waterproof your cinder block pool and enjoy years of worry-free swimming.

Why Planning is Important When Waterproofing Cinder Block Swimming Pool?

Before waterproofing your cinder block swimming pool, it is important to do some careful planning. Ensuring that all pool areas are properly covered is essential, as any gaps or cracks can lead to water seepage and cause damage over time.

Planning Before Waterproofing Cinder Block Swimming Pool

Checking for defects in the cinder blocks before commencing with waterproofing is also important, as these can create structural weaknesses and should be addressed first.

Additionally, using a high-quality waterproofing sealant designed for cinder blocks is essential to ensure the longevity of your project.

Finally, planning the installation process can help you save money in the long run and prevent costly mistakes or rework due to improper application.

Taking these precautions can also lead to a successful waterproofing job that will keep your pool safe from water damage for years.

Follow This Tips to Keep Cinder Block Pool Protective For Years:

Maintain proper water chemistry:

Maintaining proper water chemistry is the best way to protect your cinder block pool for years.

This includes:

  • Regularly checking the pH level of your pool.
  • Balancing it as necessary.
  • Ensuring adequate levels of chlorine keep bacteria and algae at bay.

Clean the surface regularly:

Regularly cleaning your cinder block pool’s surface helps prevent dirt, debris, and other materials from building up and damaging the waterproof sealant. Use a soft brush or vacuum cleaner to remove any buildup without damaging the sealant.

Inspect for leaks:

You should regularly inspect for any signs of leaks in your cinder block pool. Look for any wet spots around the edges, discoloration on the walls, or dampness in the air. If you find any leaks, you should repair them right away to avoid further damage.

Inspect for Leaks

Make repairs as necessary:

If your cinder block pool experiences a lot of wear and tear over time, you may need to make repairs. Applying a thin coat of sealant can help fill in any cracks or gaps that have developed over time while also providing an extra layer of protection.

Following these tips will help keep your cinder block pool safe and waterproof for many years.

Safety Precautions and Advice When Installing a Cinder Block Pool

1. Always read and follow the instructions on your sealant products.

2. When applying sealant, wear appropriate safety gear, such as goggles, gloves, and a dust mask.

3. Make sure that all corners and edges are properly sealed and covered.

4. Take all necessary safety precautions when using a saw or other cutting tools.

5. Use ladders or scaffolding when necessary, and ensure they are stable and secure when in use.

6. Have an inspection done by a qualified professional before filling the pool with water.

Frequently Asked Questions:

Why do cinder block walls leak water? 

Cinder block walls are prone to leaking water due to the material’s porous nature. Over time, gaps and cracks can form in the mortar joints between blocks, leading to water seepage and damage. It can also cause structural weaknesses. Using a high-quality waterproofing sealant and ensuring all pool areas are properly covered is essential to keep water from seeping in and damaging the structure.

How much will it cost for annual maintenance of the cinder block pool? 

The cost of annual maintenance for a cinder block pool depends on the size and condition of the pool. Generally, it will cost around $300-$400 to maintain a standard-sized cinder block pool. This includes regular water testing and chemical balancing, surface cleaning, inspection for leaks, and repairs as necessary.

What is the best way to prevent water leakage in a cinder block pool? 

The best way to prevent water leakage in a cinder block pool is by applying a waterproof sealant to all exposed surfaces and ensuring no gaps or cracks between blocks. This will create a barrier against water seepage and also help strengthen the structure.

Additionally, regularly inspecting and maintaining the pool will help identify and address any problems before they become serious.


Waterproofing a cinder block pool is an easy and effective way to protect it from water damage and extend its lifespan for many more years.

Following these simple steps will help ensure that your pool remains in good condition and protected from water damage.

Just follow the safety precautions and always remember to wear protective gear to avoid the toxic chemical particles that can harm your health.

Now that you know how to waterproof a cinder block pool, you can protect your swimming pool from seasonal cracks, algae, and mold growth and increase the lifespan of your pool for the next 10-15 years.

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