Roof Cleaning University Heights, San Diego

Last updated: 2026-09-23

Roof Cleaning in University Heights, San Diego

Roof cleaning in University Heights runs $300 to $650 for most composition shingle roofs under 1,800 sq ft, using a low-pressure soft wash treatment instead of a pressure washer. We treat the black streaking common on north-facing slopes near Trolley Barn Park and Park Boulevard, most of it algae growth called Gloeocapsa magma, not dirt.

University Heights has a mix of 1920s and 1930s Craftsman bungalows and a run of newer infill along Meade Avenue and Polk Avenue. Almost all of it still has composition shingle, or on the older bungalows, wood shake tucked under a newer comp layer. None of that surface tolerates a direct pressure blast.

Why Do Roofs Near Trolley Barn Park Get Dark Streaks?

The marine layer sits over University Heights most mornings from May through July, and roofs shaded by mature trees along Mississippi Street and Alabama Street stay damp longer than roofs in full sun. That moisture is what lets algae take hold on the north-facing slope first, then spread toward the ridge over a year or two.

We treat it with a sodium hypochlorite based solution applied at low pressure, usually under 100 PSI through a fan tip, then let it dwell for 10 to 15 minutes before a low-pressure rinse. That kills the algae down to the roots instead of just knocking the visible streak off the granule surface, which is what happens when someone runs a rental pressure washer straight up a comp shingle roof.

What Pressure Washing Does to a Comp Shingle Roof

A direct pressure wash strips the protective granules right off the shingle. Once those granules are gone, the asphalt underneath is exposed to UV and starts breaking down years ahead of schedule. We've bid re-cleanings on roofs that a previous crew hit with a rental unit at 2500 PSI, and the granule loss was visible sitting in the gutters afterward.

What Does a Roof Cleaning Job Look Like on a University Heights Bungalow?

A typical 1,600 sq ft single-story bungalow off Madison Avenue takes 60 to 90 minutes: setup, application, dwell time, and a low-pressure rinse from the ground or a ladder depending on pitch. We don't walk on comp shingle roofs steeper than a 6:12 pitch. Steep roofs get treated with an extension pole from the eaves, which is slower but doesn't risk cracking tile or shifting shingles underfoot.

Older homes near Park Boulevard sometimes still have original wood shake under a comp overlay, and that combination needs a gentler dwell time and a second light rinse so moisture doesn't get trapped between layers.

How Often Does a University Heights Roof Need Cleaning?

Most roofs in this neighborhood need treatment every 2 to 3 years. Roofs under heavy tree cover near the canyon edges toward Mission Valley sometimes need it closer to every 18 months because the shade keeps them damp longer after our winter rains.

We also handle pressure washing, soft washing, and driveway cleaning for University Heights properties, and a full breakdown of our roof process is on the roof cleaning page. If we've treated your roof in University Heights, we'd appreciate a mention of the street and what you had done in your Google review.