How to Properly Clean James Hardie Siding

clean james hardie siding

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James Hardie siding, known for its durability and low maintenance, is popular among Minnesota homeowners. Despite its robustness, it requires regular cleaning to ensure longevity and effectiveness. This blog post provides a concise guide on how to properly clean James Hardie siding to keep your home looking great and well-protected.

What is James Hardie Siding Made Of?

James Hardie siding is crafted from fiber cement, a blend that includes Portland cement, sand, and cellulose fibers. This composition makes the siding highly resistant to fire, moisture, pests, and rot, setting it apart from other siding materials like wood or vinyl. Its resilience makes it an optimal choice for various climates, especially areas prone to severe weather.

The Importance of Regular Cleaning

Regular cleaning not only enhances the curb appeal of your home but also prevents the buildup of dirt, mildew, and mold, which can degrade the material over time. While James Hardie siding is engineered to resist moisture, neglecting routine cleaning can lead to unsightly and potentially damaging mold and mildew growth.

How Often Should You Clean Your Siding?

It’s advisable to clean your siding at least once a year, although the specific frequency can depend on your local climate and the exposure of your home to dirt and pollutants. Homes in areas with high humidity or those close to roads may require more frequent cleaning to prevent the accumulation of contaminants.

Step-by-Step Guide to Cleaning James Hardie Siding

  1. Preparation: Begin by ensuring all windows and doors are closed to prevent water from entering your home.
  2. Rinsing: Use a garden hose with a low-pressure setting to rinse the siding, starting from the top and working your way down. This initial rinse removes loose dirt and debris.
  3. Cleaning Solution: Mix warm water with a mild, non-abrasive detergent. For areas with mold or mildew, a solution of water mixed with mild bleach can be effective.
  4. Washing: Apply the cleaning solution using a soft brush or cloth. Scrub gently to avoid damaging the siding’s surface. For larger areas, a soft brush with an extension handle can be useful.
  5. Rinsing Again: Thoroughly rinse the siding with clean water to remove any soap residue, which can attract dirt if left on the surface.
  6. Checking and Touch-Ups: After cleaning, inspect the siding for any areas that might need additional cleaning or touch-ups.

Tips for Maintaining James Hardie Siding

  • Avoid Pressure Washing: High-pressure washing can damage the surface of fiber cement siding. Stick to gentle cleaning methods to preserve the integrity of the siding.
  • Treat Stains Promptly: Addressing stains or mold spots immediately can prevent them from setting in and becoming more difficult to remove.
  • Regular Inspections: Periodically inspect your siding for signs of damage or wear, such as cracks or chips. Early detection of issues can save on costly repairs later.

In Summary

Maintaining your James Hardie siding doesn’t have to be a daunting task. With regular cleaning and proper care, your siding can continue to protect and beautify your home for many years. By adhering to these straightforward steps and recommendations, you can ensure that your investment remains in excellent condition, enhancing both the curb appeal and the longevity of your home.

If you have any questions or need guidance on how to properly clean James Hardie siding, don’t hesitate to contact us. We’re here to assist you through every step of the process.

Ben Juncker


When Ben Juncker was sitting in his high school career planning class, siding installer was not on his list of potential career paths. As with most people in the construction industry, certain questionable life choices led to a point where they were wearing a tool belt, working with their hands. His path started just this way and he would not change a thing. Those early years in his business of scraping and clawing their way to profitability and stability, have helped him to build a culture of hard work and perseverance at Craftsman’s Choice. Ben started his company in 1998 and they installed their first James Hardie job in 2000. Since that time Craftsman’s Choice has become one of the nation’s top James Hardie Remodelers. They have won James Hardie’s prestigious President’s Club award every year since it’s inception in 2015.

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