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How to Waterproof Your Walls With Waterproof Exterior Paint

Published: 21 Feb 2022 | Modified: 17 Aug 2026

Quick Summary

Learning how to waterproof your walls starts with inspecting exterior surfaces for cracks, damage and possible water-entry points. Repair visible defects, address gaps around vulnerable areas and choose suitable waterproof exterior paint or other wall waterproofing treatment based on the condition of the surface. Proper preparation, application and regular inspection can help protect exterior walls from rain, humidity and moisture-related damage.

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TABLE OF CONTENTS

Your dream abode is one of the most valuable possessions of your life. You need to focus on the maintenance of your house, starting from waterproofing the exteriors. But wait a minute, you should first know how waterproofing your house can help with its maintenance?

The exterior walls of your house are exposed to rain, humidity, and other weather conditions. Especially during the monsoon, water can seep through the exterior walls and affect the interior walls of your house. While the monsoon is a blessing for the farmers, homeowners begin to worry about protecting their house. Does this make you wonder how to waterproof exterior walls?

Since damp walls can lead to mold growth and other severe damages to your walls, you need to find ways of waterproofing them. Some easy preventive measures, such as applying waterproof exterior paint, can help you out. This article discusses various ways of waterproofing exterior walls and protecting the entire house from damage. The steps are discussed in detail below:

Step 1: Look for Cracks in the Walls

Your walls will eventually become weak and develop cracks. These cracks can cause dampness and structural damage to your house. Therefore, you should figure out these damages on the walls even before finding weatherproof exterior paint.

The cracks on the walls can occur because of anything from cracks in the bricks to issues with your drainage system. After finding the cracks, you have to find out ways to fill up the cracks. Do this before the rainy season kicks in to prevent water leakage in your house.
Step 2: Choose a Weatherproof Exterior Paint

You can paint your walls with waterproof or weatherproof exterior paint to avoid damage. The exterior wall paint is supposed to protect the walls apart from increasing the aesthetics of your house. The exterior wall paint should be able to act as a barrier between the walls and rainwater and humidity. No matter if you choose to paint vinyl, metal, or wood, weatherproof or waterproof paint for outside walls is a prudent option.

You have to determine which paint will be the best for your house and the first step towards doing that is identifying the difference between waterproofing and weather-proofing. If you are looking for a weatherproof paint, then Nerolac Excel Mica Marble Stretch & Sheen – a premium exterior emulsion paint will be a great choice. The unique properties of this long lasting, weatherproof paint will make sure the walls stand the test of time.

You can apply the paint on your exterior walls with appropriate undercoating. Exterior emulsion paint can be a prudent choice for waterproofing your walls. Emulsion paint is humidity-proof and can be easily applied. The thick exterior paint will offer protection to your outside walls and help in waterproofing exterior.
Apply the Weatherproof Paint

After finding the appropriate waterproofing paint for your exterior walls, you will have to apply the paint on your walls. You can call professionals to paint the outside walls of your house. But you can also do it on your own. You will have to use a brush or roller for coating your outside walls with weather resistant paint. Sometimes your walls might need a second coating of exterior paint. But never apply the second coat of paint until the first coat dries out properly. Exterior painting of your house should be able to create a strong barrier against infiltration.
Focus on Caulking

Apart from applying waterproof paint for outside walls, you also need to focus on caulking. As the windows of your house become old, the seal around the windows, as well as the frame, will become loose. It might be possible to buy new windows, but you should invest in professional caulking services every five to seven years. You need to tighten the seals to prevent water from seeping through the cracks.
Test Your Walls

A water tightness test should be done to ensure that you have been able to successfully waterproof your walls. The test requires you to spray water on the surface of your walls for two hours. A moisture meter should show no moisture for your home to pass the water tightness test.

Final Thoughts

Now that you know how to waterproof exterior walls, you should get it done as soon as possible. Waterproofing your walls will increase your home value by preventing severe damage.

Key Takeaways

Inspect exterior walls for cracks, damaged areas and potential sources of water penetration before painting.
Waterproof exterior paint can provide an additional protective layer against weather exposure when used appropriately.
Prepare and repair the wall surface before applying exterior paint for better adhesion and performance.
Pay attention to window seals, joints and other gaps where water can potentially enter the wall.
Persistent dampness or leakage may require investigation beyond simply applying waterproofing wall paint.
Regular inspection and maintenance can help identify moisture-related problems before they become more serious.

Nerolac Paints, a leading paint company in India offers a wide range of wall paint colours & painting services & solutions for homes & offices.

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FAQs

Can waterproof exterior paint stop water from entering walls?

Waterproof exterior paint can help protect an exterior wall surface from rain and moisture exposure, but it should not automatically be considered a complete solution for every type of water penetration. The source of dampness should first be identified. Cracks, damaged joints, leaking pipes, roof issues or drainage problems may require separate repairs or waterproofing treatment. The appropriate coating should also be selected according to the wall surface and manufacturer's recommendations.

How do I know if my exterior wall needs waterproofing?

Look for recurring damp patches, peeling or blistering paint, cracks, water stains, mould growth, or deterioration that appears after rain. Pay particular attention to areas around windows, doors, roof edges and wall joints. If moisture continues to appear after surface repairs or painting, investigate the underlying source instead of repeatedly applying paint. Persistent or extensive dampness may require assessment by a qualified waterproofing or building professional.

Is waterproofing wall paint suitable for every exterior wall?

Not necessarily. The suitability of waterproofing wall paint depends on factors such as the wall's existing coating, surface condition, material, exposure to rain and moisture, and the specific product's intended application. Before painting, remove loose or damaged material and prepare the surface according to the product instructions. If the wall has active leakage or significant structural damage, address the underlying problem before relying on a protective paint coating.

What should I do before applying waterproof exterior paint?

Start by inspecting and cleaning the exterior surface. Repair suitable cracks and damaged areas, remove loose or peeling paint, and ensure the surface is appropriately prepared and dry according to the coating manufacturer's instructions. Check areas around windows, doors and joints for gaps that may allow water entry. Applying the correct primer or undercoat where specified can also help create a suitable base for the exterior coating.

How often should exterior walls be checked for waterproofing problems?

Exterior walls should be inspected periodically, particularly before and after periods of heavy rainfall. Look for new cracks, peeling paint, damp patches, staining, damaged sealants and areas where water appears to collect. The exact maintenance or repainting interval depends on the coating, surface condition, local climate and exposure. Instead of following one fixed schedule, address visible deterioration promptly and follow the paint manufacturer's maintenance recommendations.

Can wall waterproofing paint fix dampness caused by plumbing leaks?

Paint alone should not be used to conceal dampness caused by a plumbing leak. The source of the moisture needs to be identified and repaired first. Once the affected area has been appropriately repaired and is suitable for recoating, the wall can be prepared and finished with a coating designed for the surface and intended conditions. This approach prevents the paint from simply masking an ongoing moisture problem.