Integrity Pro Washers Team
Professional pressure washing and soft washing specialists serving San Diego County.
Last updated: 2026-04-23
What Roof Cleaning in San Diego Actually Looks Like
Roof cleaning in San Diego removes algae, lichen, and moss from tile, shingle, and flat roofs using low-pressure soft washing at 100 to 150 PSI. Most 1,500 to 2,500 square foot roofs cost $450 to $950 and take three to five hours. Pressure washing cracks tile and voids shingle warranties, so soft washing is the only safe option.
Last updated: April 2026
We started cleaning roofs full-time in 2019. Stopped using pressure on them in 2021. Three years of warranty claims from other crews taught us what not to do.
Why San Diego Roofs Stain More Than You'd Think
San Diego gets fog off the ocean half the year. That moisture feeds gloeocapsa magma, the black algae that streaks north-facing roof slopes. Homes in Point Loma, Ocean Beach, and La Jolla see the worst of it. We clean those neighborhoods almost weekly.
Inland stays drier, but the June gloom pushes marine air as far east as El Cajon some years. So the staining still shows up on shaded slopes in Santee and La Mesa.
And then there's tile. Clay barrel tile holds moisture in the valleys between pieces. Moss colonies form in six months if a roof is unshaded and humid. A tile roof in Del Mar we treated last October had moss mats an inch thick in the north valleys.
How Much Does Roof Cleaning Cost in San Diego?
We quote after we look at the roof. Not before. Here's the range we've seen across 200-plus jobs last year.
| Roof Type | Typical Size | Price Range | Time on Site |
|---|---|---|---|
| Asphalt shingle | 1,500 sq ft | $450 to $700 | 3 hours |
| Concrete tile | 2,000 sq ft | $600 to $900 | 4 hours |
| Clay barrel tile | 2,500 sq ft | $750 to $1,200 | 5 hours |
| Flat torchdown | 1,200 sq ft | $350 to $550 | 2 hours |
Steep pitches add 15 to 25 percent. Anything over a 7/12 pitch needs harnessing, and that slows us down. So does heavy tree cover that means we're brushing debris off before the chemical hits the surface.
Why We Soft Wash, Not Pressure Wash
This is the part every homeowner gets wrong when they call around. A 3,000 PSI pressure washer on a shingle roof strips the granules in seconds. Those granules are the shingle. Without them, the asphalt below bakes in San Diego sun and the roof fails in three to five years instead of twenty.
Tile is worse. High pressure cracks the glaze. Water then soaks into the tile body, freezes in colder inland winters, and the tile splits. We've pulled out broken Spanish tile on jobs in Mission Hills that the last crew pressure washed two winters earlier.
So we soft wash. Sodium hypochlorite diluted to 3 to 4 percent, a surfactant to help it cling, a low-pressure rinse after. The chemistry kills the algae and moss. Sun and rain do the rest over the following weeks.
What We Won't Clean
Some roofs are past cleaning. A shingle roof with curling tabs, granule loss, or visible nail heads is at end of life. We tell the homeowner and walk. A wash won't add years. It might take some off.
Tile roofs with cracked or slipped tile get a repair referral first. We don't walk a roof that's going to hurt the roof or hurt us.
How Often Should a San Diego Roof Be Cleaned?
Coastal homes within three miles of the ocean: every 2 to 3 years. Inland homes with heavy tree cover: every 3 to 4 years. Dry, unshaded inland homes: every 5 to 7 years if at all.
We schedule spring and early summer for most roof work. The winter rains have passed. Temperatures are mild enough that the soft wash mix stays active long enough to work. By October, we shift to interior and driveway jobs before the next rainy stretch.
For more on the soft washing method, see our soft washing service page. For the warranty piece specifically, read why we stopped pressure washing roofs three years ago.
If we cleaned your roof recently in your neighborhood, we'd appreciate a Google review that mentions your area and the roof type. That's what helps other neighbors find us.