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Asphalt shingle roof half cleaned of dark black algae streaks

Roof cleaning in Reading, PA

Roof soft washing and black algae removal in Reading, PA

Treat dark streaks on asphalt shingles with a low-pressure soft wash instead of a blast of water. Quotes are in writing before work starts.

  • Low pressure, never a high-pressure blast
  • Black algae streaks treated at the source
  • Gutters, plants and siding protected

Step 1 of 3

What needs cleaning?

What is roof cleaning, and how is it done safely?

Roof cleaning in Reading is a soft wash treatment. A cleaning solution is applied to the shingles with a low-pressure sprayer, left to work for a short time, and rinsed gently. The solution kills the algae that causes dark streaks. The water pressure stays close to that of a garden hose.

That is very different from a pressure washer. High pressure strips the protective granules from asphalt shingles, can lift tabs, and can push water under the roof layers. Our blog post on why high pressure can damage roof shingles explains the risks in detail. The goal of a roof wash is to clean, not to scour.

Before the job, the crew protects plants, rinses landscaping, and checks gutters and downspouts. The work is done from ladders and safe roof positions, and the roof is rinsed from the top down.

What are the dark streaks on roofs in Reading?

The streaks that run down many roofs in Berks County are usually a type of black algae, not dirt. It feeds on moisture and on the limestone filler found in many asphalt shingles. Humid summers help it spread, and shade from oak and maple trees makes it worse. The north-facing slope often looks the worst.

Streaks start small and spread downhill as rain carries spores along. Early on they are mostly a looks problem. A heavy covering can hold moisture against the roof, and a stained roof can put off a buyer or catch an inspector's eye.

Moss is different. It holds water and can lift shingle edges, so it needs careful removal. Ask the crew how they deal with it before you agree to the work. Algae-resistant shingles exist, but older roofs often do not have them.

Which roofs can be soft washed, and which need special care?

Asphalt shingles are the most common roof in the Reading area and the most common soft wash job. Other surfaces need more care.

  • Slate. Some older Reading homes have slate, which can crack under foot traffic and spray.
  • Wood shake. It can splinter and soak up water, so it needs a gentle approach.
  • Flat or low-slope roofs. Many rowhouses have rubber or membrane sections where seams and flashing can be loosened by spray.
  • Very old or brittle asphalt. If shingles are curling, cracked or losing granules already, cleaning may not be the right step.

A crew should look at the roof from the ground first, tell you what they see, and decline or adjust the work if it is risky. If the roof is near the end of its life, a roofer may be a better first call. Many shingle makers also have care guidance, so check any warranty paperwork you have.

Roof cleaning is priced by the job. These factors matter most:

  • Roof size and pitch, since steep roofs take more care and time
  • The number of stories and how easy it is to reach the roof
  • How much algae or moss there is
  • Landscaping, gutters and siding that need protection below
  • Complex roofs with dormers, valleys and several levels

Get the method and scope in writing. A quote that never mentions how the roof will be cleaned, or that talks about pressure, should lead to questions. If you also want the siding done, ask about a combined quote for house washing.

How long does it take, and when should you call?

Most roofs take a few hours, though large or steep roofs take longer. Streaks often fade over the following days and weeks as the treated growth washes away in the rain, so the roof may not look perfect when the crew leaves. Ask what to expect for your roof.

Roof cleaning is done in dry weather above freezing. Wet shingles and frost are a slipping hazard, and cleaning solutions work slowly in the cold. Spring and early fall are common times in this part of Pennsylvania.

Call when you see dark streaks spreading, moss at the shingle edges, or when you are getting ready to sell. For a ground-level job that goes well with it, look at driveway cleaning, or return to the home page to see everything we do.

  • Free written quotes
  • Local crews
  • Safe soft-wash methods
  • Fast scheduling

Questions about pressure washing in Reading

Can a roof be cleaned without damaging the shingles?

Yes, when it is done with a soft wash. Low pressure and a cleaning solution treat the algae without stripping granules. High pressure is what causes damage, so ask how the crew plans to clean your roof and at what pressure before you agree to a quote.

Will the black streaks come back?

They can. Algae spores travel on wind and rain, and shade and humidity help them grow. Roofs under heavy tree cover often show new growth sooner. Trimming branches back so the roof gets more sun and airflow can slow it down.

Is it safe to leave the roof alone?

For a while, usually yes. Dark streaks are mostly a looks problem at first. Over time, heavy growth and moss can hold moisture against the shingles. If you are unsure, have someone look at the roof and tell you whether cleaning or a roofer is the better first step.

Do I need to be home for a roof cleaning?

Usually not, but the crew needs outdoor access and a water source. Move cars and outdoor furniture away from the house, close windows, and keep pets inside. Confirm all of this when you receive your quote so the day goes smoothly.

Does cleaning my roof affect my warranty?

It can, depending on the shingle maker and the method. Many manufacturers say high pressure can void a warranty. Read your paperwork or contact the maker before the work, and ask the crew whether the method matches the maker's care guidance.

How it works

1

Send photos or request a visit

Tell us what needs cleaning.

2

Get a written quote

Clear price before any work starts.

3

We clean and tidy up

Rinse, check and leave the site clean.

Request roof washing

Tell us what you need and we call you back.

No obligation.

Step 1 of 3

What needs cleaning?

Ready when you are. Call now or request a quote online.

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