Interior & Exterior Paint
Can You Paint Hardie Backer Board – What You Need to Know
HardieBacker is a cement backer board made primarily as a tile substrate, so painting is possible in some exposed applications but is not its usual intended finish.
Published · Interior & Exterior Paint
Hardie Backer board is not designed to be painted. However, it is possible to paint this board if desired. The ability of this board to hold paint depends on some factors such as the paint, the preparation, and the application method.
In this guide, we will explore some more things that you need to know when you’re planning to paint your Hardie Backer boards. So, whether you're a DIY enthusiast or a professional contractor, keep reading to learn more.
What Is Hardie Backer Board?
HardieBacker is a cement-based backer board used behind tile and other finishes where moisture resistance, dimensional stability, and a firm substrate are needed.
It helps to prevent moisture damage and provides a stable surface for the tiles to adhere to. It is an excellent option for homeowners who want to ensure the longevity and stability of their tile installations.
It is often used as a substitute for traditional plywood or drywall underlayment in areas where moisture is present. This board is available in different thicknesses, ranging from 1/4 inch to 1/2 inch, depending on the application. The boards come in standard 3 foot by 5 foot sheets, making it easy to transport and install.
Can You Paint Hardie Backer Board?
HardieBacker can be painted when it will remain exposed, but its intended use, moisture conditions, joints, and compatibility with the chosen coating should be considered first.
If you do decide to paint this board, it is essential to use the correct type of paint and preparation techniques to ensure a long-lasting and durable finish. You should use a high-quality, 100% acrylic paint that is suitable for use on masonry surfaces.
Before painting, the board should be cleaned thoroughly with soap and water, and any loose or flaking areas should be repaired. A primer designed for masonry surfaces should be applied to ensure proper adhesion of the paint.
Note that painting Hardie board will not make it completely waterproof, and it may not be as durable as other finish options such as tile or stone. Therefore, it may not be the best decision in areas that will be exposed to high moisture or wear and tear.
Also, take a look on the following section to understand why you think again before painting HardieBacker board.
First, this board is not designed to be a finished surface, and it does not have the same properties as other materials that are commonly painted, such as drywall or wood. This board is porous and has a rough texture, which makes it difficult to achieve a smooth, even finish when painting.
Second, the board is designed to be water-resistant, and painting it can compromise its ability to resist moisture. Painting this board can create a surface that is less resistant to water penetration and can lead to problems such as mold growth or tile failure.
Finally, most tile installations are done in areas where moisture is present, and using paint on HardieBacker board can create a surface that is less resistant to water, which can lead to damage over time.
Can You Paint Hardie Board a Different Color?
Fiber-cement siding products can often be repainted, but HardieBacker is a different tile-underlayment product and should not be treated as ordinary exterior siding.
To paint it, you need to follow a specific process to ensure that the paint adheres properly. The basic steps are –
- Clean the surface of the board thoroughly to remove any dirt, debris, or loose paint.
- Sand any rough areas and feather out any sharp edges with fine-grit sandpaper.
- Apply a high-quality exterior primer to the entire surface of the board. Be sure to choose a primer that is compatible with fiber cement siding.
- Allow the primer to dry completely before applying the paint. Apply one or two coats of high-quality exterior paint to the primed surface, using a paintbrush or a sprayer.
- Allow the paint to dry completely before applying a second coat, if necessary.
Should You Paint Hardie Backer Board before Install?
Painting HardieBacker before installation is usually unnecessary because cutting, fastening, joint treatment, moisture exposure, and final use may all affect the finished surface.
Additionally, painting before installation can make it more difficult to install properly. The paint can create a slippery surface that can cause the boards to slide out of place during installation. It can also make it more difficult to achieve a tight fit between the boards, which can compromise the integrity of the siding.
If you really want to change color of your Hardie Backer board, it is advised to install board first and then paint it after installation. This will ensure that the siding is properly installed and that the paint adheres correctly to the surface.
Can You Spray Paint Hardie Board?
Spray application may be possible on exposed cement board, but the coating must suit cementitious surfaces and the board's actual environment rather than relying on spray format alone.
Before spray painting, make sure the surface is clean and free of dust and debris. It's also important to apply the paint in the right weather conditions, typically between 40 and 90 degrees Fahrenheit with low humidity.
When spraying, use a high-quality paint sprayer and be sure to apply the paint evenly in thin layers. It's also a good idea to test a small area first to ensure the paint adheres properly and looks the way you want it to.
What Kind of Paint Do You Use for Hardie Board?
Use primer and paint compatible with cementitious backer board, with the exact system chosen for interior, exterior, dry, damp, or other service conditions.
100% Acrylic Paint: Acrylic paint is the most popular choice for Hardie board due to its excellent adhesion, durability, and color retention. It's also resistant to fading, cracking, and peeling, making it an ideal option for exterior applications.
Elastomeric Paint: This type of paint is highly flexible and can stretch up to 600%. It is an excellent choice for the board that expands and contracts with changing temperatures.
Urethane-Modified Acrylic Paint: This paint offers the benefits of both acrylic and urethane paints, providing top adhesion, durability, and weather resistance. It is also highly resistant to cracking, fading, and mildew growth.
How Well Does Hardie Backer Board Hold Paint?
Paint adhesion on HardieBacker depends on dust removal, moisture control, surface condition, joint treatment, primer choice, and whether the coating suits cement-based board.
This paint still may not hold paint as other surfaces such as drywall or wood. This is because Hardie board is a cement-based material that is porous and has a rough texture, which can make it difficult for paint to adhere evenly.
Before painting, it may be a good idea to consult with a professional painter or tile installer to determine the best approach for your specific project.
Final Verdict
HardieBacker can be painted in suitable exposed applications, but it remains primarily a tile backer, so moisture management and coating compatibility matter more than color.