Roof Soft Wash in Des Moines
Gentle algae removal that extends shingle life.
Black streaks on asphalt shingles are algae (Gloeocapsa magma) feeding on the shingles. JBL Exterior Pros uses ARMA-approved soft washing — low-pressure biocide application — that kills the growth without damaging granules or voiding manufacturer warranties. Results show within 1–2 weeks across central Iowa.
- Result timeline
- Visible in days, full clarity 1–2 weeks
- Treatment cycle
- Every 2–4 years typical
- Standard
- ARMA-approved, warranty-safe
Roof Soft Wash, in detail.
Black streaks on your roof aren't dirt — they're algae feeding on your shingles. We soft-wash roofs with a low-pressure biocide that kills the growth at the source without damaging granules or voiding warranties.
- Asphalt shingle roofs
- Tile and metal roof treatment available
- Gutter and fascia cleaning included around treated areas
- Landscaping protected before, during, and after
- Manufacturer-approved solution
Three steps, no surprises.
- 01
Roof inspection and quote
We inspect from the ground and ladder — checking pitch, shingle condition, and growth severity. The written quote is precise to your roof.
- 02
Pre-rinse and soft-wash application
Landscaping gets pre-rinsed. We apply the biocide at low pressure across affected areas. It works on contact — most algae visibly lighten the same day.
- 03
Final rinse and confirmation
Roof and surroundings get a final rinse. Most full results show within 1-2 weeks as the dead growth weathers off.
Roof Soft Wash, on the job.
Frequently asked roof soft wash questions
01Will soft-washing void my shingle warranty?
No — we use ARMA-approved (Asphalt Roofing Manufacturers Association) low-pressure methods. Pressure washing roofs WILL void warranties; we never do that.02How long until the black streaks disappear?
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.03How often does a roof need this?
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.04How much does roof soft washing cost in Des Moines?
Pricing depends on roof square footage, pitch, and algae severity. The ARMA-approved soft-wash method costs more than pressure washing — but pressure washing voids most shingle warranties and ages roofs prematurely. We quote in person after the inspection.05What about tile or metal roofs?
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.06Will it damage my copper flashing or aluminum gutters?
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.07Why not just pressure-wash the roof? It's cheaper.
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.08What time of year is best?
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.
Ready for roof soft wash?
A JBL rep walks your property in person within one business day. Honest pricing, real recommendations, no obligation.