Roof Cleaning North Park, San Diego

Last updated: 2026-08-05

Roof Cleaning in North Park, San Diego

Roof cleaning in North Park is a soft wash job, not a pressure job. We apply a sodium hypochlorite blend at 100 to 150 PSI to kill the algae and moss, let it dwell 10 to 15 minutes, then rinse. Most North Park roofs run $400 to $900 depending on pitch and square footage.

Integrity Pro Washers works North Park most weeks. The block grid between University Avenue and Adams, from Texas Street east to the 805, is mostly 1920s Craftsman bungalows with composition shingle, mixed in with Spanish revival homes carrying original barrel tile.

Those two roof types fail differently.

Why North Park roofs streak and grow moss

The black streaking on shingle roofs is gloeocapsa magma, a cyanobacteria that feeds on the limestone filler in asphalt shingles. It shows up on the north facing slope first because that side stays damp the longest. June Gloom is the driver here. Six weeks of morning marine layer with no sun to burn it off gives the algae exactly what it needs, and the tree canopy along streets like 30th, Dale, and Granada keeps whole roof sections shaded until noon.

Moss is the worse problem. On a bungalow off Hamilton Street we pulled moss mats that had lifted three courses of shingle off the deck. Once moss roots into the granule layer it holds water against the shingle, and that is how a roof loses ten years of life early.

How we clean a North Park roof

We never put 3000 PSI on a roof. A surface cleaner or a turbo nozzle strips granules off asphalt shingle and voids most manufacturer warranties, and on old barrel tile it blows water under the tile lap and into the underlayment.

Our roof work runs through a soft wash setup at 100 to 150 PSI with a downstream injector. The mix is a sodium hypochlorite blend with a surfactant to hold it on the slope, applied from the ridge down, dwelling 10 to 15 minutes, then rinsed at low volume. Plants get pre wet and post rinsed. The bougainvillea and citrus that fill North Park side yards will burn if you skip that step, and we have learned to run a hose on them the entire time we are on the roof.

Tile roofs get walked carefully or not at all. On the Spanish homes near the North Park Water Tower we work from the ladder and a pole where we can, because a cracked barrel tile costs more to source and match than the entire wash.

What roof cleaning costs in North Park

Heavy moss adds $100 to $250 because it needs a second application and a soft brush pass. So does a roof that has never been treated. The first clean on a twenty year old shingle roof is always the slow one.

What we tell people to skip

If the shingles are curling at the edges and the granule loss already shows bare mat, cleaning is cosmetic. We will say so on the walkthrough instead of taking the job. That roof needs a roofer, and washing it just buys a nicer looking two years.

We also do not clean roofs in the middle of a hot afternoon in August. The mix flashes off the slope before it can dwell, which wastes chemical and leaves streaking. Morning work, before the surface hits about 90 degrees, gets a cleaner result.

Booking with other North Park work

Most of our roof jobs here get paired with the rest of the exterior on the same trip. Staging the rig and running 150 feet of hose takes 20 minutes before anything gets cleaned, so adding the stucco or the driveway to a roof visit is cheaper than a second appointment. See our soft washing page for stucco and painted siding, the North Park pressure washing page for driveways and walkways, or window and gutter cleaning if the gutters are packed under that same roof.

Gutters usually are. Anything we scrub off the shingle ends up in the trough, so we clear them before we leave.