Waterproofing Exterior Columns with Paint

Exterior columns are an important architectural element of any building. They provide support and add beauty to the overall structure. However, these columns are exposed to various weather elements such as rain, sun, and humidity, which can lead to damage over time. To protect and maintain the integrity of exterior columns, waterproofing paint can be a reliable solution. In this article, we will discuss how waterproofing paint can be used to protect exterior columns effectively.

What is Waterproofing Paint?

Waterproofing paint, also known as elastomeric paint, is a specially formulated coating designed to protect surfaces from water damage. It is commonly used on exterior walls, decks, and roofs to prevent moisture penetration. The unique properties of waterproofing paint allow it to expand and contract with temperature changes, creating a flexible and protective barrier.

Why Use Waterproofing Paint on Exterior Columns?

Exterior columns are constantly exposed to harsh environmental conditions, making them susceptible to damage. Here are a few reasons why waterproofing paint is an excellent choice for protecting exterior columns:

  1. Moisture Resistance: Waterproofing paint creates a barrier that prevents water from seeping into the columns. It helps to minimize moisture absorption, which can lead to rot, mold, and structural issues.

  2. Durability: Exterior columns are subject to wear and tear due to changing weather conditions. Waterproofing paint forms a durable layer that can withstand UV rays, heavy rain, and wind, extending the lifespan of the columns.

  3. Enhanced Aesthetics: Waterproofing paint comes in a range of colors and finishes, allowing you to customize the look of your exterior columns. It can breathe new life into old or worn-out columns, improving the overall aesthetic appeal of your building.

  4. Cost-Effective: Applying waterproofing paint to exterior columns is a cost-effective way to protect them. It helps to prevent costly repairs or replacement due to water damage, saving you money in the long run.

Step-by-Step Guide to Waterproofing Exterior Columns

Now that we understand the benefits of using waterproofing paint on exterior columns, let’s dive into the step-by-step guide on how to apply it effectively:

Step 1: Preparation
Before applying waterproofing paint, it is essential to prepare the exterior columns properly. Follow these steps for optimal results:

  • Clean the columns thoroughly by removing any dirt, debris, or loose paint using a brush or pressure washer.
  • Repair any cracks or damage by filling them with an appropriate filler or caulking compound.
  • Allow sufficient drying time before moving to the next step.

Step 2: Primer Application
Applying a primer is crucial to ensure proper adhesion of the waterproofing paint. Here’s what you need to do:

  • Select a high-quality exterior primer suitable for your column material (wood, concrete, or metal).
  • Apply the primer evenly to the columns using a brush or roller. Make sure to cover the entire surface.
  • Allow the primer to dry completely before proceeding to the final step.

Step 3: Waterproofing Paint Application
Now it’s time to apply the waterproofing paint to your exterior columns. Follow these instructions:

  • Stir the waterproofing paint thoroughly to ensure an even distribution of pigments and additives.
  • Using a brush or roller, apply the paint evenly to the columns, making sure to cover all exposed areas.
  • Depending on the manufacturer’s instructions, you may need to apply multiple coats for optimal protection. Allow each coat to dry completely before applying the next one.

Note: If you’re using a textured or stamped waterproofing paint, follow the manufacturer’s instructions regarding the application technique for achieving the desired texture or pattern.

Frequently Asked Questions (FAQs)

  1. How often do I need to reapply waterproofing paint on my exterior columns?
    The longevity of waterproofing paint varies depending on factors such as weather conditions and product quality. Generally, it is recommended to reapply every 5-10 years as a preventive measure.

  2. Can I use waterproofing paint on columns made of different materials?
    Yes, waterproofing paint can be used on various column materials such as wood, concrete, and metal. Make sure to choose a paint that is compatible with the specific material.

  3. Can waterproofing paint be used on interior columns as well?
    While waterproofing paint is primarily designed for exterior use, it can be used on interior columns as long as the product is suitable for indoor applications and meets safety requirements.

  4. Do I need to hire a professional to apply waterproofing paint to my exterior columns?
    While it is possible to apply waterproofing paint as a DIY project, hiring a professional can ensure proper preparation, application, and long-lasting results.


Protecting your exterior columns with waterproofing paint is a wise investment that can effectively prolong their lifespan and enhance their appearance. By following the step-by-step guide and considering the benefits of waterproofing paint, you can safeguard your columns from the damaging effects of moisture, weather, and time. Remember to choose high-quality products, prepare the columns adequately, and apply the paint with care, and you’ll enjoy the benefits of protected, aesthetically pleasing exterior columns for years to come.

Waterproofing Somerset West

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