Will cleaning damage my shingles?

Not the way we do it. Low-pressure soft wash is the method the shingle manufacturers themselves specify. Pressure washing is what causes damage.

How long does it stay clean?

Typically several years, longer with zinc or copper at the ridge and with the offending branches trimmed back.

Is the black streaking actually hurting my roof?

Algae is largely cosmetic. Moss is not — it holds moisture against the shingle and lifts the edges, and it should be dealt with promptly.

Do you clean gutters at the same time?

Yes, and it makes sense to combine them while we are already set up on your Pittsburgh home.

Do you serve Pittsburgh, PA for roof cleaning?

Yes. Pittsburgh is about 61 miles from our Sharon, PA shop, roughly 100 minutes, and it is part of our regular Allegheny County service area. We work the surrounding area on the same runs — Mt Lebanon, PA, Fox Chapel, PA, Bethel Park, PA — so a Pittsburgh job is never an isolated trip for us.

How do I pay for this?

Two paths. Storm-related damage goes through your insurance claim, where you are typically responsible for the deductible. Otherwise we offer 0% interest financing on shorter terms and longer-term financing that keeps monthly payments low, subject to credit approval. We are GAF Master Elite, Owens Corning Preferred, and IKO Craftsman certified, and fully insured in both states.

Penn Ohio Roofing

Roof Cleaning in Pittsburgh, PA

In-house crews out of our Sharon, PA shop.

Those black streaks on the north side of your Pittsburgh roof are algae, not dirt, and pressure washing them off will cost you years of shingle life.

Roof Cleaning in Pittsburgh, PA — Granule loss checked during every cleaning visit.

Soft Wash, Never Pressure

We clean asphalt shingles with a manufacturer-approved low-pressure soft wash that kills the organism and rinses it off. A pressure washer strips the granules that protect the mat from UV — the roof looks clean for a season and then ages years in a hurry. Most manufacturers will void material coverage over pressure washing, and they are right to.

Why It Grows Here

Pittsburgh sits about 107 miles inland from Lake Erie, far enough south that lake-effect snow is not the dominant stressor. Freeze-thaw cycling is — the repeated overnight freeze and afternoon thaw that works water into every seam, fastener hole, and flashing lap between November and March.

Shaded north-facing slopes stay damp long after the south side has dried, and that is where Gloeocapsa magma takes hold. Moss is the more serious problem: it holds water directly against the shingle and lifts edges as it thickens, which turns a cosmetic issue into a leak path.

Keeping It Off

Trimming overhanging limbs to get sunlight and airflow onto the slope does more than any product. On a replacement, copper or zinc strips at the ridge release trace metal ions with every rain and suppress regrowth for years. Both are cheap compared to cleaning the same roof every three seasons.

Permits and Code in Allegheny County

Permits are issued municipality by municipality under the Pennsylvania Uniform Construction Code, and every home improvement contractor working in the state must hold an active HICPA registration with the Pennsylvania Attorney General. Pittsburgh's Department of Permits, Licenses and Inspections requires a permit for re-roofing and enforces contractor licensing within city limits, and the larger municipalities such as Mt Lebanon, Monroeville, and Moon Township run their own code offices. We pull the permit for your job and handle the inspection scheduling — you should never be the one on the phone with a code office about your own roof.

What Is Roof Cleaning?

Roof cleaning is the removal of the black algae streaking, moss, lichen, and debris that build up on shingles. On Pittsburgh homes the black streaks are almost always Gloeocapsa magma, an airborne algae that feeds on the limestone filler in asphalt shingles. It is cosmetic at first and destructive later — moss and lichen hold moisture against the shingle and shorten the life of the roof.

How Roof Cleaning Is Done Correctly

1Soft washing: a low-pressure application of a cleaning solution that kills the organism, followed by a gentle rinse. Pressure never exceeds what a garden hose delivers.
2The solution is left to dwell so it kills the algae at the root rather than just bleaching the surface.
3Plantings, siding, and walkways are pre-wet and rinsed so nothing downstream is damaged.
4Valleys and gutters are cleared of debris in the same visit, since that is where moisture sits longest.

Safe Cleaning Practice

Soft wash only — it is the method ARMA and the shingle manufacturers accept.
Clean before moss establishes a root structure, not after it has lifted the shingle edges.
Address the shade and drainage that let it grow: trim overhanging limbs, clear the gutters.
Consider zinc or copper strips at the ridge to slow regrowth.

Methods to Avoid

Pressure washing an asphalt roof. It blasts off the granules that are the shingle's UV protection and will void the manufacturer warranty.
Scraping or wire-brushing moss off. It takes the granules with it.
Undiluted bleach with no plant protection.
Walking a wet, algae-covered roof — it is as slick as ice.

Warning Signs on a Pittsburgh, PA Home

Black streaks running down the slope, usually worst on north-facing planes.
Green moss cushions along the shingle butts or in the valleys.
Crusty gray-green lichen spots that will not rinse off.
Granules collecting in the gutters.
Debris packed in the valleys holding moisture.

What Drives the Cost of Roof Cleaning in Pittsburgh

•Roof square footage and pitch.
•How heavy the growth is and whether it is algae, moss, or lichen.
•Access and landscaping protection required.
•Whether gutter cleaning and minor repairs are bundled in.

Roof Cleaning Work Near Pittsburgh

Representative projects from our crews across the Shenango Valley and the PA/OH border.

Granule loss checked during every cleaning visit. Pittsburgh, PA. — Granule loss checked during every cleaning visit.

Gloeocapsa magma streaking lifted without pressure washing. Pittsburgh, PA. — Gloeocapsa magma streaking lifted without pressure washing.

Finished roof after cleaning, warranty fully intact. Pittsburgh, PA. — Finished roof after cleaning, warranty fully intact.

Manufacturer credentials

GAF Master Elite Contractor. Held by a small percentage of roofing contractors nationwide. Required to install the GAF Golden Pledge warranty — 50 years on materials, 25 years on workmanship, transferable once. GAF inspects the completed roof before issuing the warranty.
Owens Corning Preferred Contractor.
IKO Craftsman.
Fully insured in Pennsylvania and Ohio. In-house crews — no subcontractors. Family-owned and operating out of Sharon, PA since 2000.

Path 1 — Insurance claim

For wind, hail, or storm-driven damage. We walk the roof with your insurance adjuster and document what we find so nothing that should be covered gets missed. We are not a public adjuster — that is a separate PA license — and we do not negotiate the settlement. We document damage, meet the adjuster, and rebuild what the carrier approves to code and to manufacturer spec.

Path 2 — Retail with financing

For roofs simply reaching the end of their life. 0% interest financing on shorter terms and long-term financing that keeps monthly payments low. Runs through a lending partner and is subject to credit approval. We walk through both paths in the free in-home estimate before you sign anything. See financing details →

Frequently Asked Questions — Pittsburgh

Will cleaning damage my shingles?: Not the way we do it. Low-pressure soft wash is the method the shingle manufacturers themselves specify. Pressure washing is what causes damage.
How long does it stay clean?: Typically several years, longer with zinc or copper at the ridge and with the offending branches trimmed back.
Is the black streaking actually hurting my roof?: Algae is largely cosmetic. Moss is not — it holds moisture against the shingle and lifts the edges, and it should be dealt with promptly.
Do you clean gutters at the same time?: Yes, and it makes sense to combine them while we are already set up on your Pittsburgh home.
Do you serve Pittsburgh, PA for roof cleaning?: Yes. Pittsburgh is about 61 miles from our Sharon, PA shop, roughly 100 minutes, and it is part of our regular Allegheny County service area. We work the surrounding area on the same runs — Mt Lebanon, PA, Fox Chapel, PA, Bethel Park, PA — so a Pittsburgh job is never an isolated trip for us.
How do I pay for this?: Two paths. Storm-related damage goes through your insurance claim, where you are typically responsible for the deductible. Otherwise we offer 0% interest financing on shorter terms and longer-term financing that keeps monthly payments low, subject to credit approval. We are GAF Master Elite, Owens Corning Preferred, and IKO Craftsman certified, and fully insured in both states.

Get Free Estimate 724-877-7172

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