Roof Cleaning · Service

Cleaning asphalt shingles without sandblasting the granules off

Asphalt shingles are a granule-covered product. Those granules are the UV armour. Any cleaning method that uses force as the main tool shortens the roof. Here is how shingle cleaning is supposed to work.

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In short

What is shingle roof cleaning?

Shingle roof cleaning means removing algae, moss and organic soiling from asphalt shingles with a method that does not strip protective granules. The industry-standard approach is soft washing — low pressure, cleaning solution, dwell time, gentle rinse. High-pressure washing can make a roof look briefly cleaner while permanently thinning the surface that keeps the asphalt alive.

The job

How shingle roof cleaning actually works

Confirm the roof is asphalt and still cleanable

Curling, widespread bare asphalt, brittle breakage underfoot and active leaks change the job from cleaning to roofing assessment. Cleaning does not resurrect a roof that is out of granules already.

Watch for: A cleaning quote with no comment on roof condition. Honest operators sometimes walk away.
Choose soft wash as the default on shingles

Solution is applied at low pressure; chemistry kills growth; time does the work. Rinsing, when done, stays gentle. This is the opposite of "cut the pressure a little on the washer".

Watch for: Marketing that says soft wash while the trailer only carries a pressure washer and tips. Equipment tells the truth.
Foot traffic and staging discipline

Technicians should walk with care on dry, sound shingles, avoid breaking seal strips in heat when possible, and keep traffic off fragile valleys and ridges when reach allows. Cleaning damage is often foot damage, not only water damage.

Watch for: Crews running across hot south slopes in midsummer like a sidewalk. Softened asphalt and broken bonds follow.
Moss versus film growth on shingles

Thin algae films respond to treatment and weather-fade. Thick moss may need careful mechanical assistance after it is killed — never as a high-pressure substitute for dwell. Moss that has lifted tabs needs roofing judgment, not only cleaning.

Watch for: Scraping dry living moss hard against granule surfaces. You will fill the gutters with roof material.
Plant protection and runoff control

Same soft-wash plant discipline as any roof clean: pre-wet, cover sensitive species, manage downspouts. Shingle jobs are often larger surface areas with more runoff volume.

Watch for: Open windows, fresh car paint in the driveway, and uncovered copper that was never discussed.
Aftercare and realistic colour expectations

Cleaned shingles look more even as dead growth releases. They will not look factory-new if years of UV have already weathered the mineral surface. Document before/after honestly for HOA or resale files.

Watch for: Pressure "touch-ups" offered when the fade is not instant. That is the moment granules leave.
Coordinate with gutters and downspouts

Released growth and rinse water head for the gutter system. A shingle clean that leaves outlets blocked simply relocates the moisture problem to the eaves. Many quality visits include gutter attention or schedule it the same week.

Watch for: Overflowing gutters the first storm after a "complete" roof clean. Ask who owns gutter clearing in the quote.

Money

What does shingle roof cleaning cost?

Asphalt shingle cleaning is typically priced by roof area, pitch, height and growth type. Soft-wash shingle jobs cost more than a quick blast would — that difference is the point. Steep three-story homes and heavy moss add labour. Bundle quotes should still name method and pressure approach.

See the full shingle roof cleaning cost guide — by material, size and region →

Straight answer

When shingle roof cleaning is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

Granules are already mostly gone and the asphalt looks shiny and dark. Cleaning cannot replace a surface that has worn away.
You insist on high pressure because a driveway crew offered a deal. Wrong tool class for shingles.
The roof is under an active manufacturer process that forbids the proposed chemistry. Follow the product guidance you care about keeping.
Structural roofing repairs are open. Fix leaks and missing shingles first.
You have a tile, metal or slate roof. Use those material pages; shingle rules do not transfer completely.
Moss has deformed large areas of tabs and a roofer has already recommended replacement. Cosmetics will not reverse mechanical damage.

Straight answer

Can I do this myself?

Ladders, roof pitches and garden chemicals are a bad mix. Bleach mixes on a roof can damage plants, metals and lungs, and walking wet shingles is a fall risk. High-pressure rental equipment is especially easy to aim at granules by mistake.

Reasonable to DIY

Clearing gutters from a stable ladder when you are competent and belted as appropriate
Trimming branches that keep a shingle slope constantly damp
Photographing stains seasonally so you can brief a pro accurately

Call a licensed pro

Any chemical roof treatment on a full asphalt roof
Anything that requires walking steep or multi-story roofs
Moss removal that involves more than light, dead residue cleanup
Any offer that depends on a pressure washer as the primary tool on shingles

Before you sign

What to check when hiring for shingle roof cleaning

Describe your soft-wash setup for asphalt — pump, approximate pressure, and rinse practice.

Specific answers beat the phrase soft wash on a flyer.
How do you handle thick moss on shingles without high pressure?

Moss is where bad operators escalate force.
What insurance covers roof walking and chemical application?

Homeowner policies do not substitute for operator cover.
Will you refuse the job if the roof is too far gone?

A yes is a good sign.
What plant protection is included in the price?

Should be a procedure, not a hope.

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Related work

Often done at the same time

Soft Wash Roof Cleaning

Method explained

Roof Algae Removal

Black streak biology

Roof Moss Removal

When moss is the main problem

Roof Cleaning

General hire guide

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FAQ

Shingle Roof Cleaning — questions people ask

Still have a question? Talk to our team →

Can I pressure wash asphalt shingles on a low setting?

Low setting is still the wrong mental model. Soft washing uses different equipment philosophy: chemistry first, water as a carrier and rinse. If the business model is a pressure washer with the dial turned down, keep looking.

Will cleaning void my shingle warranty?

Manufacturer language varies. Many caution against high-pressure cleaning and improper chemicals. Using a documented soft-wash approach is the usual path that aligns with protecting the product; keep your own warranty documents and ask the cleaner what they apply.

How often should shingles be cleaned?

Only as often as growth and appearance require. Over-cleaning is unnecessary wear and chemical exposure. Shaded, damp climates need more frequent attention than dry, sunny ones.

Why are there granules in my gutters after cleaning?

Some background granule loss is normal aging. A sudden heavy dump after a cleaning visit is a warning that force or aggressive brushing was used. Photograph gutters before and after when you are concerned.

Is soft wash the same as shingle cleaning?

Soft wash is the method; shingle cleaning is the substrate job. Almost all responsible asphalt cleaning is soft wash. This page stresses granule and warranty issues specific to shingles.

What about "bleach-free" cleaners?

Products vary. What matters is effectiveness on the growth you have, compatibility with plants and metals, and application at low pressure. Brand slogans are less important than operator discipline.

Are architectural and three-tab shingles cleaned the same way?

Both want soft wash rather than high pressure. Architectural shingles are thicker and sometimes more walk-sensitive in heat; three-tabs can be more brittle when aged. The chemistry approach is similar; foot traffic discipline may differ with age and temperature.

What should I do after a professional shingle cleaning?

Keep gutters clear of released growth, watch plantings for a few days, and avoid climbing the roof while it is wet. Note any areas the crew flagged for roofing repair and get those quoted separately. Schedule preventive discussion if shade and moisture are permanent features of the site.