Hardie Board House Washing in St. Johns, FL
Looking for professional fiber cement siding house washing in St. Johns, FL? The Pressure Kru safely removes algae, mold, mildew, pollen, dirt, and black streaks from Hardie Board siding using our low-pressure soft washing process. We proudly clean homes throughout Julington Creek Plantation, Nocatee, Ponte Vedra, Fruit Cove, Rivertown, Shearwater, SilverLeaf, Aberdeen, Durbin Crossing, and surrounding 32259 neighborhoods. Please take a moment to flip thru our Hardie board house wash picture gallery. Our house pressure washing services will restore your homes exterior.
What is hardie board?
Hardie board is a type of fiber cement siding manufactured by James Hardie Industries. It is made from a blend of cement, sand, cellulose fibers, and water, creating an exterior siding that is durable, attractive, and resistant to many of the problems that affect traditional wood siding.
Why homeowners choose Hardie board
- Resists rot caused by moisture.
- Won’t be eaten by termites or other wood-destroying insects.
- Fire resistant because it is non-combustible.
- Handles Florida’s humidity better than many wood products.
- Can withstand strong winds when properly installed.
- Available in many styles, including lap siding, shingles, vertical panels, and trim.
Does Hardie board need to be cleaned?
Yes. Although Hardie board is extremely durable, it is still susceptible to Green algae, Mold and mildew, Dirt and pollen, Spider webs, Rust stains (from irrigation or metal fixtures). In humid areas like St. Johns, Jacksonville, Nocatee, St. Augustine and Northeast Florida in general, north-facing walls and shaded areas often develop algae that can make the home look dirty.
Can you pressure wash fiber cement siding?
It should not be cleaned with high pressure.
The recommended method is a soft wash, which uses:
- Low water pressure (similar to a garden hose)
- Specialized cleaning solutions to kill algae and mold
- A gentle rinse that removes contaminants without damaging the siding or forcing water behind it
High pressure can:
- Damage the factory finish
- Force water behind the siding
- Void manufacturer warrant
How often should it be cleaned?
For most homes in Northeast Florida:
Homes with heavy shade, dense trees, or poor sun exposure may benefit from annual cleaning.
Every 12–24 months is typical, but…….you can safely softwash a Hardie Board House as often as you like. The manufacturer goes a bit further to recommend cleaning your Hardie board every 6 to 12 months so I’m not going to complain here. Our family has owned a Hardie board siding home for the last 7 years. Hands down it is the best and most durable substrate and I have owned them all. Personally, I softwash the front elevation of our house 5 or more times per year. Looks absolutely brand new every time. So if you do the math Ive softwashed our front elevation over 35 times in 7 years!
Yes. Soft washing uses specialized cleaning solutions and low-pressure rinsing to remove mold and algae without damaging the cement siding finish. High-pressure washing can chip, etch, or erode the substrate if used improperly.
Most Florida homes benefit from professional house washing every 12–24 months depending on tree coverage, moisture and algae growth. Our recommendation is at least once per year.
Organic growth itself doesn’t usually destroy cement siding, but it traps moisture against the painted surface, making routine maintenance important.
Many DIY pressure washing mistakes involve using excessive pressure too close to the wall. Soft washing is generally considered the safer approach for residential cement siding.
If you have your home exterior soft washed at least every 12 months then no. If you have delicate plants under the roof drip line then they are pre-rinsed before and after cleaning.
Click the on the arrows in the image gallery below for hundreds of before-and-after Fiber Cement Siding cleaning jobs.
