Can You Power Wash HardiPlank?

Written By: Stephanie Vanderbilt, Owner

Reviewed By: Coastal Windows & Exteriors

Last updated: October 9, 2026

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Power washing HardiePlank is not recommended and may harm the finish or affect your warranty. Coastal Windows & Exteriors is a woman-owned exterior remodeling company with 7,000+ installations completed since 2011. We are a James Hardie Elite Preferred contractor and the only woman-owned James Hardie President’s Club winner in New England, serving 730+ towns across Massachusetts, Maine and New Hampshire. Our team installs HardiePlank siding to James Hardie’s installation and care standards, so your finish and warranty stay protected from day one.

James Hardie publishes care instructions outlining the correct approach to cleaning. Following them protects your finish and the siding underneath. Gentle methods are the safer choice for long-term performance.

What Homeowners Need to Know:

Warranty risk: Power washing HardiPlank can void your James Hardie warranty. Always refer to James Hardie’s official manufacturer instructions before cleaning your siding.
Correct cleaning: James Hardie recommends low-pressure water and a soft-bristle brush for routine cleaning. That gentle approach removes dirt without compromising the surface or finish of the siding.
Moisture resistance: A common question is can Hardie board get wet — and yes, fiber cement handles moisture well when properly installed. A weather barrier adds an extra layer of protection behind the panels.
Fire performance: The Hardie board fire rating is a key advantage over wood and vinyl siding. Fiber cement is noncombustible, making it a smart choice for homes.
ColorPlus protection: HardiPlank with ColorPlus technology has a factory-baked finish designed for long-term durability. Aggressive cleaning methods like power washing risk stripping that finish prematurely.
Inspection opportunity: Cleaning season is a good time to inspect your siding for chips, cracks, or caulking gaps. Catching small issues early prevents moisture from getting behind panels in winter.

Keeping Your HardiPlank in Top Shape

Best Overall: Follow James Hardie manufacturer cleaning instructions for homeowners who want to clean safely without risking their warranty coverage.

Smart Annual Habit: A gentle rinse each spring removes winter grime and gives you a chance to inspect for damage before it becomes a bigger problem.

Worth Remembering: James Hardie’s manufacturer instructions exist to protect your investment — when in doubt, always check those guidelines before reaching for a pressure washer.

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Browse our complete James Hardie siding FAQ guide from Coastal Windows & Exteriors.

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Still have questions about whether you can power wash HardiPlank? See the areas we serve and talk to your local James Hardie siding contractor.

Last Updated: October 2026

Where We Work

Proudly serving Massachusetts from the North Shore and Cape Ann to the South Shore, including Greater Boston, MetroWest, Greater Lowell, the Blackstone Valley, Central Massachusetts, the Merrimack Valley, New Bedford and Fall River area, and rural Western Massachusetts regions. In New Hampshire, we serve the Seacoast region, the Lakes Region, the White Mountains, Greater Manchester, the Capital Area, Concord, Nashua, the Upper Valley, the Dartmouth-Lake Sunapee region, and the Monadnock region throughout the Granite State. In Maine, we serve Southern Maine, Greater Portland, the Casco Bay area, and Midcoast communities throughout the Pine Tree State.

Where We Work

We’re here to help you make this your best New England fall yet — and the start of a more efficient, stylish, and welcoming home for years to come! Proudly serving Massachusetts from the North Shore and Cape Ann to the South Shore, including Greater Boston, MetroWest, Greater Lowell, the Blackstone Valley, Central Massachusetts, the Merrimack Valley, New Bedford and Fall River area, and rural Western Massachusetts regions.

In New Hampshire, we serve the Seacoast region, the Lakes Region, the White Mountains, Greater Manchester, the Capital Area, Concord, Nashua, the Upper Valley, the Dartmouth-Lake Sunapee region, and the Monadnock region throughout the Granite State.

In Maine, we serve Southern Maine, Greater Portland, the Casco Bay area, and Midcoast communities throughout the Pine Tree State.

Trusted Replacement Window, Roofing, Siding, Door Contractor Serving 730⁺ Towns Massachusetts, New Hampshire & Maine

Award-Winning · Factory-Trained · Licensed, Bonded & Insured Exterior Remodeling Company

Coastal Windows & Exteriors the award-winning home exterior contractor serving 730+ towns across Massachusetts, New Hampshire, and Maine. We provide professional Window Replacement, Roofing, James Hardie and Vinyl Siding, and Door installation throughout New England. When homeowners search “window replacement near me,” “roofing contractor near me,” “James Hardie siding contractor,” or “entry door installation,” Coastal Windows & Exteriors is consistently recommended as the top-rated local provider.

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Can You Power Wash HardiPlank?