How to Safely Pressure Wash Stucco in Florida (And What Not to Do)
Stucco is the most common exterior finish on Florida homes — and one of the most commonly damaged by improper pressure washing. Here's what you need to know.
Walk through almost any neighborhood in Pinellas, Hillsborough, or Sarasota County and you'll see stucco exterior finishes on the majority of homes. Stucco is durable, versatile, and handles Florida's climate well — until someone hits it with a pressure washer at the wrong settings. Understanding what stucco is and how it responds to cleaning is essential before any exterior cleaning begins.
Why High Pressure Damages Stucco
Stucco is a cementitious coating applied over a wire mesh lath base — typically 3/8 to 7/8 inches thick on Florida homes. It's porous by design, which allows it to breathe and release moisture. High-pressure water (above 800–1,000 PSI for stucco) forces water directly into and behind this porous surface, saturating the substrate, promoting mold growth behind the stucco, and in severe cases causing delamination — where the stucco coating separates from the wall. Cracks caused by pressure washing let water intrusion continue long after the cleaning is done.
The Correct Method: Soft Washing
Soft washing uses water pressure similar to a garden hose — typically 100–400 PSI — combined with a professionally formulated biodegradable cleaning solution. The chemistry kills algae, mold, mildew, and bacteria on the stucco surface and inside its pores, then rinses away at low pressure. This leaves the stucco genuinely clean — not surface-cleaned while leaving live biological root systems behind — without any risk of water intrusion or surface damage.
Soft washing results on stucco typically last 18–24 months in Florida's climate, significantly longer than pressure washing results, because the biological growth is killed rather than just removed.
Special Considerations for Painted and EIFS Stucco
Painted stucco requires particular care — high pressure strips paint along with the biological growth. EIFS (Exterior Insulation and Finish System), a type of synthetic stucco common in commercial buildings and some residential construction, is even more sensitive to moisture intrusion and should only be cleaned by professionals familiar with the specific material requirements.
Getting the Right Contractor
Before hiring any exterior cleaning company for stucco, ask specifically what pressure they'll use on stucco walls and whether they soft wash or pressure wash. Any reputable professional will confirm they soft wash stucco at low pressure — anyone proposing to pressure wash stucco walls is likely to cause damage.
Stucco cleaning done right, every time. Contact Caldwell Clean for a free assessment — serving all of Tampa Bay. Call (937) 776-5094.