Why would you need to clean it? Just kidding! 🙂 Like any outdoor product, even the ultra durable James Hardie Siding needs a little TLC once in a while. Things like bird droppings, dust, and pollen can accumulate on any exterior surface. Before you start cleaning — know that there’s a right way, and a wrong way! So be sure to use our tips.
Here’s how to safely and effectively clean James Hardie fiber cement siding.
James Hardie Siding shouldn’t need cleaning very often. It is resistant to mold, mildew, and fading. James Hardie fiber cement siding requires very little maintenance, but like all things, it can get a bit dirty over time. Luckily it’s very easy to clean! In most cases, all you will need is a soft cloth or brush, a garden hose, and a little mild soap. If you have a larger area to clean or extra buildup, then power washing may be the way to go. Caution should be taken with any high pressure cleaning, because if done incorrectly it can result in damage to the siding. Follow these cleaning methods for the best results:
Soap & Soft Brush Method
- Choose a mild biodegradable soap like dish soap.
- Use a soft brush or cloth.
- Reel out the garden hose.
To make the job even easier, many hardware stores sell extension poles with brushes or sponges. When choosing a soap, avoid harsh chemicals. Harsh chemicals may damage the siding. If you are dealing with mold and mildew buildup, you can choose a mild cleanser like Jomax®, Mildew Check® or Mold Armor®. Make sure to dilute any concentrated soaps like dish soap. A little goes a long way. Now you can clean away the dirt and lightly scrub the siding. Start from the top and clean with the direction of the siding. Use a side to side motion when cleaning horizontal planks. Be sure to completely rinse it free of any soap residue.
Pressure / Power Washing
Use Caution!!! This can be a great, quick way to clean siding, but power washing can damage fiber cement siding. If you are not experienced with power washing, consider hiring a professional. Do Not sandblast! If you feel confident in your pressure washing skills, then make sure to follow these precautions to minimize damage.
- Use wide fan tips.
- Keep a minimum distance of 6 feet from the wall.
- Use pressures under 1500 psi.
If the dirt on the home is minimal, then try the soap and brush method with a garden hose first. It’s best to avoid pressure washing if you can, since it can result in damage to the siding finish. Regular care and maintenance can extend the life and beauty of your James Hardie Siding. James Hardie Siding comes with a 30 year warranty!
- James Hardie Siding Cleaning & Maintenance PDF
- James Hardie Performance & Durability
- James Hardie Siding 30 Year Warranty
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