Asphalt Shingles
The black streaks aren’t dirt — they’re algae, moss, and lichen feeding on your shingles. We kill it all at the root with a gentle, low-pressure soft wash — no granule loss.
Get a fast quoteLocally owned · Fully insured · Warranty-safeRoof Soft Wash
Roof Soft Wash
in Johnston, Iowa
We’ll add years of life back to your roof.
— Johnston & central Iowa
The best roof soft wash in Johnston.
Black streaks on asphalt shingles aren't dirt — they're a hardy algae (Gloeocapsa magma) that feeds on the shingle itself. JBL Exterior Pros clears it with a gentle, low-pressure soft wash that kills the growth at the root, never a pressure washer — high pressure strips the granules that protect your shingles and can void the warranty. We soft-wash roofs across Johnston and central Iowa, and the streaks fade within a week or two. From Beaver Creek area, Northbrook, Greendale to the rest of Johnston, JBL covers every ZIP in the city — 50131, Polk County.
— Why Johnston homes need this
Roof Soft Wash, the Johnston way.
The homes
Johnston runs 1980s–2010s subdivisions for the most part — executive-scale homes with brick fronts, vinyl side and rear, attached three-car garages. The Beaver Creek and Saylorville-adjacent properties trend larger and more wooded.
Some newer lakefront/lake-near homes have wraparound decks and outdoor kitchens that need pressure-wash + soft-wash combinations. Asphalt shingle roofs are universal; few tile, few cedar shake.
On the roof here
Johnston's roofs are universally asphalt shingle across its 1980s-through-2010s subdivisions, and after twenty-plus years many are showing the black streaking that asphalt invites here — Gloeocapsa magma algae that takes hold first on north-facing slopes and anywhere shade lingers.
The larger, more wooded executive lots out by Beaver Creek and the Saylorville-adjacent properties are the worst of it: overhanging oak, maple, and walnut keep slopes damp, feed the streaking, and let moss creep in under the canopy in Crown Point, Camelot, and Northbrook. We treat all of it with a low-pressure soft wash — never pressure washing, which strips the granules and shortens a shingle's life. The wash kills the algae at the root and lifts the staining without touching the roof's wear surface.
— What we treat
Our Johnston roof washing services
Tile & Metal Roofs
Surface-safe chemistry tuned to the material — tile and standing-seam metal cleaned gently, never blasted at high pressure.
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Roofline & Fascia
Gutters, fascia, and soffits around the treated areas are cleaned as part of the job — not left half-done.
Get a fast quote— Whole-home care
Bundle services & save.
Add soft washing, pressure washing, or gutter cleaning to your roof washing package and get your whole Johnston home done in one visit — at one discounted price.
— How it works
Getting your roof treated has never been easier.
Get a fast quote
Skip the runaround. Tell us about your roof — pitch, age, and how bad the streaking is — and get clear, honest pricing, fast.
Set a schedule
We come at a time that works for you, show up when we say we will, and treat your roof with a gentle, low-pressure, warranty-safe soft wash.
Sit back & relax
You don’t lift a finger. We protect your landscaping, kill the algae at the root, and add years of life back to your shingles.
What central Iowa homeowners are saying.
Real reviews from the families and properties we’ve cared for across central Iowa.
“The crew came and did my windows, the deck, and soft-washed the house — they did a great job. Up-and-coming young company doing good work.”
“Super thorough, prompt, professional — and fantastic work. Our house sparkled when they were finished. I've hired window washers before and was always bummed by streaks the next day. Not so with JBL — everything looked perfect, even after it rained.”
“We used JBL Exterior Pros for a complete exterior soft washing of our home and are extremely happy with the results. The work was completed exactly as promised and on schedule. A team of four arrived promptly, were professional and courteous, and did an exceptional job with minimal disruption.”
“JBL did a fantastic job soft washing our house and deck for a very reasonable price. The dirt had piled up on our siding over the years and I'd tried to clean it myself to no avail. They were upfront, easy to work with — we're having them back for the windows and screens.”
“Amazing job! Our house looks like it got a brand new paint job. The team was so friendly and kind to our family and we are so happy with how it turned out. 10/10 would recommend and will use them again in future years.”
“Tatum was great to work with, and gave our windows a much needed cleaning after winter.”
— Where we work
The best roof soft wash in Johnston & central Iowa.
Locally owned and on the road across the metro — from downtown Des Moines out to Ames, Adel, and Indianola. If you’re near one of these, we’ve got you covered.
— Good to know
Roof soft wash questions, answered.
The things Johnston homeowners ask us most, before the first visit. Don’t see yours? Just ask.
Yes — JBL Exterior Pros covers every Johnston neighborhood and ZIP code (50131, Polk County), from Beaver Creek area, Northbrook, Greendale to Saylorville-adjacent. We're on Johnston streets regularly — only 10 miles from downtown Des Moines.
No — we use the gentle, low-pressure soft-wash method that keeps your shingle warranty intact. Pressure washing a roof is what voids warranties, and we never do that.
The algae dies immediately on contact. Visible lightening shows within days; full clarity typically takes 1-2 weeks as rain and weather flush the dead growth off the shingles.
Every 2-4 years for most central Iowa roofs, depending on tree cover and exposure. Annual members get yearly inspections and treatment only when needed.
Roof soft wash in Johnston is priced by the size of your home and the scope of the job — every Johnston property is a little different. Every quote is free and walked in person within one business day, so the price reflects the actual home, not a flat rate.
Soft washing works on both. Tile (less common in central Iowa) needs careful chemistry to avoid surface fading; metal is straightforward. We confirm the roof type during the in-person quote and adjust approach.
Not when done right. Standard soft-wash solutions are safe for both. We pre-rinse all flashing and gutters before application and rinse again afterward. Improper chemistry left to dwell on metals can cause staining — we never let that happen.
Pressure washing a roof strips the granule layer that protects asphalt shingles from UV damage. Once the granules go, the shingles age 5x faster — a roof that should last 25 years can fail in 8–10 if it's been pressure-washed. The savings are eaten by replacing the roof early. Every major shingle manufacturer explicitly warns against pressure-washing.
Spring (April–May) and fall (September–October) are ideal — consistent temperatures, no flash-drying in heat, no freeze concerns. Summer roof soft-wash works but we schedule around the hottest days. Winter we don't soft-wash roofs in central Iowa.
— The first visit
Ready for roof soft wash in Johnston?
A JBL rep walks your Johnston property in person within one business day — honest pricing, real recommendations, no obligation.
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