ARMA Compliance · Soft-Wash Only · Warranty-Friendly
Why We Don’t Pressure-Wash Roofs.
The Gold Standard, Every Time.
Pressure-washing an asphalt-shingle roof voids most manufacturer warranties and shaves five to ten years off the roof’s life. The Asphalt Roofing Manufacturers Association — the industry body that writes the standards — explicitly recommends a low-pressure chemical wash. Period. That’s the only method we use on a Northeast Florida roof.
The Damage Cycle
A pressure washer wins the streak fight and loses the roof.
An asphalt shingle is built around ceramic-coated granules pressed into an asphalt base. Those granules do two jobs: they reflect ultraviolet radiation, and they conduct heat away from the asphalt. They are the entire reason a thirty-year shingle is rated for thirty years. Without them, the asphalt below cooks, cracks, and curls within a few summers.
A consumer pressure washer puts out 2,500 to 4,000 PSI. A surface cleaner mounted on the end of a wand pushes that same pressure straight into the granule bed. The granules — which are bonded with a thermoplastic adhesive that softens at Florida summer roof-deck temperatures of 150 to 170 degrees — release. They wash off in the rinse water, into the gutters, into the downspouts, and out onto the driveway. Every homeowner who has ever pressure-washed their own roof has stood in their driveway afterward, looked at the black grit pile around the downspout, and felt the small panic of recognizing it for what it is.
Lose the granules and the shingle ages on a different timeline. A roof rated for twenty-five to thirty years that gets pressure-washed once will typically need replacement at year fifteen to eighteen. Pressure-wash it on a recurring basis and you can cut the life by half. That’s the trade: a clean-looking roof for one season, in exchange for tens of thousands of dollars of accelerated replacement cost. The math never works.
What ARMA Actually Says
Technical Bulletin Three. Algae discoloration of roofs.
The Asphalt Roofing Manufacturers Association publishes Technical Bulletin 3 — the industry-standard guidance on how to clean an asphalt shingle roof that’s developed dark streaking. It’s the document GAF, CertainTeed, Owens Corning, IKO, and Tamko all reference when their warranty teams answer cleaning questions. The bulletin runs only a few pages, and the recommendation is uncomplicated.
Paraphrased from ARMA Technical Bulletin Three
Two things matter in that paragraph. First: the active ingredient is sodium hypochlorite — household bleach. Not a proprietary “miracle” chemistry, not a surfactant-only soap rinse, not a citric-acid mix. The hypochlorite is what kills the organism that is feeding on the roof. Second: the application is low-pressure. Soft-wash equipment in the trade runs around 60 PSI at the tip — gentler than a garden hose. That’s the entire ARMA method. Anyone who tells you a roof needs more pressure than that is selling you a roof replacement on a delay.
Two Methods, Two Outcomes
Same streak. Same roof. Wildly different futures.
FCPE Soft-Wash (ARMA-Compliant)
- Sodium hypochlorite blended on-site to a 1-3% working solution per ARMA TB-3
- Roof-grade surfactant added to extend dwell on a sloped surface
- Pressure under 60 PSI at the tip — gentler than your garden hose
- Eight to fifteen minutes of dwell — the chemistry does the work, not the water
- Landscape pre-saturation and post-rinse — beds neutralized before and after
- Granule loss: zero. Manufacturer warranties stay intact (GAF, CertainTeed, Owens Corning)
- Cyanobacteria killed at the cellular level — streaks don’t grow back from buried colonies
- Re-treat interval: 3 to 5 years on shingle, 4 to 6 on tile
Pressure-Washing a Roof
- 2,500-4,000 PSI directed straight into the granule bed
- Granules release into the rinse stream — visible black grit at every downspout
- Water forced under the shingle course — sets up a slow leak path through the deck
- Ceramic coating on remaining granules abraded — UV protection compromised
- Manufacturer warranty voided on most asphalt shingles (read your warranty card)
- Surface streaks gone for the season — bacterial colonies left alive in the porous substrate
- Streaks return in 6 to 12 weeks, often darker than before the wash
- Effective roof life shortened by 30 to 50% over the lifecycle
The FCPE Method
Soft-wash. Neutralize. Document. Done right the first time.
Every roof we treat follows the same disciplined sequence. There are no shortcuts on a Northeast Florida roof. The humidity, the seasonal rain, and the salt-air drift on coastal homes all conspire to turn any half-measure into a return visit you didn’t pay for. Our crew is trained to follow the ARMA-method protocol from inspection through rinse — and to log every step on the job ticket so the homeowner gets a written record of exactly what was applied and where.
Pre-Saturate The Landscape
Every plant, shrub, and bed within drift range gets fresh-water saturation before any chemistry leaves the pump. Wet leaves repel hypo; dry leaves absorb it. Tarps deployed over delicate plantings — orchids, ferns, anything coastal-tender. This step alone separates an ARMA-method wash from the cheap operators.
Mix Hypo To Spec
Sodium hypochlorite blended on-site to a 1 to 3% working solution depending on bloom severity. Heavy streaking gets the higher end; cosmetic touch-ups get the lighter mix. Mix ratio gets logged on the ticket — the homeowner sees what concentration touched the shingle, not just a generic “soft wash” line item.
Apply Low-Pressure
Twelve-volt soft-wash pump applies the chemistry from the ground or a controlled-edge access point. Even passes, top to bottom of each roof plane. Pressure stays under 60 PSI through the entire application. We don’t walk on tile, and we don’t drag hose across ridge cap.
Dwell Eight To Fifteen Minutes
The chemistry needs time to penetrate the bacterial cell wall and finish the kill. Streaks visibly fade in real time during dwell. Under-dwelling is the single most common reason cheap operators leave streaks — the pump finishes before the chemistry does. We let it work.
Neutralizing Rinse
Roof rinsed with low-pressure fresh water. Gutters and downspouts flushed. Beds re-rinsed if any drift is detected on the post-walk. Any rust streaks on metal flashing get an oxalic post-treatment after the main wash dries. Salt-air homes get a chloride-neutral final rinse on metal accents.
Document & Guarantee
Before/after photos taken from the same vantage points. Job ticket signed off. Recommendations made in writing for the next service interval. Streaks back from a measurable cyanobacteria return on a properly-treated plane within twelve months? We come back at no charge — logged in our system the day we leave.
What We Look For During The Wash
We don’t fix roofs. We flag what we see.
A soft-wash crew spends twenty to forty minutes with eyes on every plane of your roof. That’s a vantage point a homeowner standing in the driveway never gets. We don’t perform roofing repairs — that’s a different trade, with different licensing — but we do log everything we observe and put it in writing on the way out. The homeowner gets a heads-up before the small problem becomes a phone call to a roofer at three a.m. in a thunderstorm.
Flashing Integrity
The metal flashing around chimneys, skylights, and wall transitions is where most roof leaks start — not the field of the shingle. We flag separation, lifted edges, missing sealant, and corrosion. Note the location on the ticket so a roofer knows exactly where to look.
Valley Pooling
Roof valleys carry the most water during a Florida thunderstorm. Debris build-up — pine needles, oak catkins, palm fronds — creates a dam that backs water up under the shingle course. We clear what we can during the wash and flag any valley that’s structurally pooling.
Pipe-Boot Age
The rubber boots around plumbing vent stacks dry out in seven to ten years on a Northeast Florida roof. UV is brutal here. A cracked pipe boot is the second-most-common leak source after flashing. We log the visual condition and rough age.
Chimney Crown & Cap
Concrete chimney crowns crack with thermal cycling. Once cracked, they admit water down the inside of the chimney chase — a leak that’s almost invisible from inside the house until the drywall stains the master closet. We flag visible cracks and missing caps.
Granule Loss
Even on a roof we haven’t pressure-washed, age and storm wear cause granule loss. We note the worst zones (typically south- and west-facing planes) so the homeowner has data when budgeting for replacement.
Ridge-Cap Wear
Ridge caps take the worst weather on the roof. They wear through five to seven years before the field. Lifted, missing, or curled caps get noted on the ticket — a re-cap is a fraction of the cost of a full re-roof, but only if you catch it before water gets in.
Local Context
In Northeast Florida, the streak has a name. Gloeocapsa magma.
The dark blue-green streaks running down a Jacksonville, Ponte Vedra, or Yulee roof aren’t dirt. They aren’t soot. They aren’t tree-sap. They are a living organism — a cyanobacteria called Gloeocapsa magma — that thrives in the warm, humid, occasionally-rainy conditions that define our climate from May through October. The bacteria feeds on the limestone filler that asphalt-shingle manufacturers blend into the granule mix to slow UV degradation. Every streak you can see from the street represents a colony that’s been working on the limestone in your roof for one to three years.
Three things separate Northeast Florida from inland markets and accelerate the cycle. The humidity rarely drops below 60% for more than a few weeks a year. Summer afternoon thunderstorms keep north- and east-facing planes damp for hours after every rain. And the salt-air drift from the Atlantic — particularly inside the barrier-island and intracoastal corridor — creates a slightly mineral-rich micro-environment that the bacteria loves. Roofs in St. Johns, Duval, and Nassau counties bloom faster than roofs anywhere else in the state east of Tampa.
A pressure-wash strips the visible streak and leaves the bacterial colonies alive in the porous substrate. The streak comes back. A proper ARMA-method soft-wash kills the organism at the cellular level — the streak takes years to return because there’s no surviving colony to repopulate from. That’s the difference between a roof that looks clean and a roof that’s actually treated.
Common Questions
What homeowners ask before booking.
Will pressure-washing actually void my warranty?
In nearly every case, yes. The major asphalt-shingle manufacturers — GAF, CertainTeed, Owens Corning, IKO, Tamko — all reference ARMA Technical Bulletin 3 in their warranty language. They will deny granule-loss claims when the cause is high-pressure water. Pull your warranty card and read the maintenance section. The phrase “in accordance with ARMA recommendations” or “low-pressure chemical cleaning only” appears in nearly every modern asphalt-shingle warranty. Soft-wash with sodium hypochlorite at the spec ARMA describes does not void the warranty. Pressure-washing typically does.
Is the chemistry safe for my plants and lawn?
Yes — when applied correctly. The protocol is pre-saturate, treat, rinse. Wet plant tissue dilutes any incidental hypo drift to near-harmless levels. The post-rinse flushes anything that did land. We tarp anything coastal-tender (orchids, certain ferns, hibiscus in bloom) before any chemistry leaves the pump. The risk is real but it’s a procedural risk, not a chemistry risk — meaning a cheap operator who skips the pre-saturate is the actual danger to your beds, not the hypo itself. Our crew never skips the pre-soak.
How bad is the smell, and how long does it last?
During the wash, the application area smells like a residential pool that’s just been shocked — a noticeable but short-lived chlorine note. Most of the smell is gone within an hour of the rinse. By the next morning, it’s undetectable. We don’t recommend opening windows on the wash side of the house during application; otherwise it’s not an issue. We schedule washes around predicted rain so the post-rinse cycle benefits from the natural Florida summer afternoon storm.
How often should a Northeast Florida roof be soft-washed?
Asphalt shingle: every 3 to 5 years for full streak suppression. Concrete and clay tile: 4 to 6 years — the tile holds bacteria deeper, so the kill lasts longer once it’s done right. Metal: typically 5 to 7 years, and the chemistry is different (oxalic-based brightener, not hypo). Homes inside the salt-air drift zone — barrier islands, intracoastal-adjacent — run on the shorter end of those intervals. Wooded lots with a tree canopy keeping the roof shaded and damp run shorter still. Our annual exterior plan includes the wash at the right interval for your roof material and exposure.
Is it safe to soft-wash a roof in light rain?
Light rain after dwell is fine — actually helpful, since it extends the rinse cycle naturally. Light rain during application is workable on most jobs, but we’ll typically pause and wait it out so we can control the dwell precisely. Heavy rain is a hard stop: the chemistry runs off before it can dwell, and we lose the kill. Northeast Florida summer afternoon thunderstorms are predictable enough that we schedule around them; our crew checks radar at the start of every wash and again before the application begins.
The Gold Standard
Treated, not just washed.
More than a century of combined expertise. ARMA-method soft-wash on every shingle, tile, and metal roof we touch. Streaks back within 12 months on a properly-treated plane and we come back at no charge — that’s the FCPE guarantee. Serving St. Johns, Duval, and Nassau Counties.