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Asphalt shingle roof partly cleaned of dark algae streaks and moss

Roof soft washing in Green Bay

Roof cleaning in Green Bay without damaging your shingles

Dark streaks and moss are usually algae and growth, not a failing roof. A soft wash cleans them off at low pressure.

  • Low pressure, never a blast on shingles
  • Plants and gutters protected
  • Written quote before work starts

Step 1 of 3

What needs cleaning?

What is roof cleaning, and why not use high pressure?

Roof cleaning in Green Bay means soft washing. A cleaning solution is applied at low pressure, left to work for a short time, then rinsed off. It kills algae and loosens moss and lichen so the roof comes clean without being scrubbed or blasted.

High pressure is the wrong tool for asphalt shingles. The surface is a layer of mineral granules held in asphalt. A strong jet knocks granules loose, which shortens the life of the shingle and leaves bare patches. It can also lift shingle edges and force water under them, where it reaches the underlayment and the roof deck. That is why we do not wash roofs the way we wash a driveway. The cleaner does the heavy lifting, and the water is just there to carry it away.

What causes dark streaks and moss on Green Bay roofs?

Those dark streaks are very often algae, which feeds on the limestone filler in some shingles and spreads along the roof wherever it stays damp. In this area, shaded slopes, roofs under trees and north-facing sides stay wet the longest, so streaks and moss usually start there. Moss and lichen show up as green or gray patches, often along the edges and in valleys.

Winter plays a part too. Snow sits on a roof for weeks, melts in daylight and refreezes at night. That moisture and the leaf litter left behind give growth a good start in spring. Streaks do not always mean damage, but moss can hold moisture against the shingle and lift edges, so it is worth dealing with once it takes hold. Some homeowners add zinc or copper strips near the ridge to slow regrowth, and a roofer can advise on that.

What affects the price of cleaning a roof?

Every roof is different, so the quote depends on what is up there. The main factors are:

  • Roof size and the number of slopes.
  • Pitch and height. Steep or tall roofs take more time and more safety setup.
  • How much algae, moss or debris has built up.
  • Access around the house for hoses and equipment.
  • Gutters, downspouts and other jobs you add, like house washing.

We quote in writing before work starts. If a company offers to clean a roof with a pressure washer at a bargain, ask how they protect the granules. A cheap price can end up costing a lot more in roof wear.

Many roofs take a few hours. Larger or steeper roofs take longer. Wet shingles are very slippery, so safety comes first, and work may stop for rain or wind. Before we begin, we wet plants and cover what needs covering. Please move cars and patio furniture away from the walls.

After the cleaner is applied, the roof is rinsed carefully so no runoff is aimed at siding or windows. Much of the staining comes off right away. Some of it fades over the next days and weeks as rain rinses the shingles. Moss may take more than one pass. We will explain what looks normal and what does not, and we will point out anything that concerns us, such as loose flashing or damaged shingles.

Is your roof ready to clean, and when should you call?

Cleaning is not a repair. If shingles are curling, cracked, missing or shedding granules into the gutters, talk to a roofer first. Washing an old, worn roof will not help it last and may speed up wear. Some shingle makers also advise against pressure washing, so check any paperwork you have.

The best time to clean is spring through early fall, when the roof is dry, the days are mild and ladders are safe. Do not clean in cold weather. If you are also thinking about the deck, our deck and fence cleaning page covers what to expect. You can also start from the home page to see all our services around Green Bay.

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.

What you can expect

1

Free written quotes
2

Local crews
3

Safe soft-wash methods
4

Fast scheduling

Request roof washing

Tell us what you need and we call you back.

No obligation.

Step 1 of 3

What needs cleaning?

Questions about pressure washing in Green Bay

Are the dark streaks on my roof algae or damage?

On asphalt shingles they are very often algae, which is a surface stain more than a structural problem. Damage looks different: curled edges, missing pieces, bald patches and granules piling up in the gutters. If you are unsure, a roofer or a close photo can help. We will tell you what we see before we start washing.

Will roof cleaning damage my shingles?

Soft washing is meant to protect them. The method uses a cleaning solution and low pressure, so the granules stay on the shingle. Damage mostly comes from high pressure or from walking on a roof that is old or brittle. If your roof is already worn out, we will say so rather than risk making it worse.

Is the cleaning solution safe for my plants and gutters?

We wet plants before and after, keep runoff away from beds where possible, and rinse downspouts and gutters at the end. A diluted solution is used, and it is rinsed off. Tell us about koi ponds, rain barrels or sensitive plants so we can plan around them.

How soon will the roof look clean?

Much of the streaking comes off during the wash. The rest tends to fade with rain over days or weeks, because the algae is dead and rinses away gradually. Thick moss may need more than one pass. Heavy staining on very old shingles may not clear completely.

Can the roof be cleaned in winter?

Generally no. Cold weather slows the cleaner, snow and ice make the roof unsafe, and water can freeze on walks and steps. Most roof cleaning in Green Bay happens from late spring to early fall. If you want a spring slot, ask early and we will plan around the weather.

Ready when you are

Call now or request a quote online.

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(920) 555-0157