If you're looking to seal your interior brick walls, you've come to the right place. Sealing brick is crucial for protecting your walls from moisture, dirt, and other elements that can cause damage over time. But with numerous sealers available, choosing the right one can be overwhelming. This guide will help you understand the types of brick sealers, their pros and cons, and how to apply them, ensuring you make an informed decision for your home.
Why Seal Interior Brick?
Before diving into the types of sealers, let's first discuss why sealing interior brick is essential. Brick is porous, meaning it can absorb water and other liquids. While this is great for exterior bricks that need to breathe, it's not ideal for interior walls. Sealing your bricks helps to:
- Prevent moisture from penetrating and causing mold or mildew growth.
- Protect against dirt, grease, and stains, making cleaning easier.
- Preserve the brick's appearance by preventing efflorescence (a white, powdery deposit that can form on brick surfaces).
- Improve energy efficiency by creating a barrier that helps regulate indoor temperatures.
Types of Interior Brick Sealers
There are three main types of interior brick sealers, each with its own advantages and disadvantages:

1. Solvent-Based Sealers
Solvent-based sealers, also known as oil-based sealers, are popular due to their durability and ability to penetrate deep into the brick. They are typically made from acrylic, silicone, or silane/siloxane and are ideal for protecting against moisture and stains. However, they have a strong odor and require proper ventilation during application. They also take longer to dry and can darken the brick's appearance slightly.
2. Water-Based Sealers
Water-based sealers are eco-friendlier and have a quicker drying time than solvent-based sealers. They are usually made from acrylic or latex and provide good protection against moisture and dirt. However, they may not be as durable as solvent-based sealers and can leave a slight film on the brick's surface. They are also not suitable for use on walls that are prone to high moisture levels.
3. Penetrating Sealers
Penetrating sealers, such as those made from silane/siloxane, work by soaking into the brick and reacting with the minerals to create a protective barrier. They are breathable, meaning they allow moisture vapor to escape while preventing liquid water from entering. However, they may not provide as much protection against stains as film-forming sealers and can be more expensive.

Choosing the Right Sealer
When choosing a sealer, consider the following factors:
- The level of protection needed (e.g., moisture, stains, or both).
- The type of brick and its condition.
- Your budget and the sealer's durability.
- Your tolerance for odor and drying time.
- Whether you prefer an eco-friendlier option.
Applying Brick Sealer
Once you've chosen the right sealer, follow these steps for application:
- Prepare the wall by cleaning it thoroughly to remove any dirt, grease, or other contaminants. Allow the wall to dry completely.
- Test the sealer on a small, hidden area to ensure it doesn't cause any adverse reactions with your brick.
- Apply the sealer using a paintbrush, roller, or sprayer, following the manufacturer's instructions. Typically, you'll want to apply the sealer in thin, even coats, allowing it to dry between coats.
- Allow the sealer to cure completely before exposing it to moisture or heavy traffic.
Sealer Maintenance
Maintaining your brick sealer is crucial for ensuring its longevity. Regularly inspect your walls for signs of wear or damage, and reapply the sealer as needed. The frequency of reapplication will depend on the sealer type, the wall's exposure to elements, and the level of foot traffic.
Sealing interior brick is a simple yet effective way to protect your walls and maintain their appearance. By understanding the types of sealers available and following the application and maintenance guidelines, you can ensure your bricks stay protected for years to come. So, don't wait - start shopping for the perfect sealer and give your interior bricks the protection they deserve!