A Roof Cleaner Used High Pressure on Your Shingles: Here’s Exactly What to Do Next

Asphalt shingles are protected by a layer of ceramic-coated granules. Those granules are not decoration. They are the shingle’s UV shield and part of its fire rating, and they are held in place by a thin layer of asphalt.

High-pressure water strips them off. It also breaks the sealant strips that bond each course to the one below, and it can drive water sideways underneath the shingles instead of over them.

The damage is rarely dramatic on day one. It shows up later as a shortened roof life, a denied warranty claim, and a blow-off in the first strong nor’easter. Here is how to assess what happened, and what your options are in Connecticut.

I will say one thing up front, because it matters for how you read the rest. We run pressure washers every week at Mr-Suds. High pressure is the right tool for concrete, pavers and certain hardscape. It is simply the wrong tool for a shingle roof, and the difference is not a matter of opinion.

Can Pressure Washing Really Damage Asphalt Shingles?

Yes. High pressure strips the protective granules off the shingle surface, breaks the thermally bonded seal strips between courses, can force water laterally under the shingles toward the deck, and can crack aged or cold shingles outright. ARMA and the major shingle manufacturers direct that asphalt shingles should not be pressure washed.

The four mechanisms, in plain terms:

Granule stripping. Once the granules are gone, the asphalt mat underneath is exposed to UV. UV exposure is what actually ages a shingle. That area now runs on a shorter clock than the rest of the roof.

Seal strip failure. Each course is bonded to the one below by an adhesive line that sets with heat. Force breaks it. Once broken, the tab is loose until it re-seals, and on an older or dirty roof it may never re-seal at all.

Water intrusion. Water directed up-slope or laterally gets under the courses. From there it reaches the deck, the underlayment, the soffits and the fascia.

Physical fracture. Cold or aged shingles crack. Edges tear. Ridge caps dislodge entirely.

The correct method on shingles is a low-pressure chemical application, which the trade calls soft washing. If you want the mechanics of that, we explain what soft washing actually is.

What “Too Much Pressure” Actually Means

You do not need to memorise numbers. You need enough to ask one good question.

A proper soft wash applies solution at roughly garden-hose-level pressure. The chemistry does the work. The water is only there to carry it and rinse it.

A contractor-grade pressure washer, meanwhile, operates in the thousands of PSI. Anything remotely near that range at the shingle surface is doing damage, whether or not you can see it that afternoon.

So the question to ask any roof cleaner before you hire them is this:

“What pressure will you be using at the shingle surface, and what product are you applying?”

If the answer involves a wand, a surface cleaner, or some version of “we turn it down a bit,” you have your answer. Turning a pressure washer down is not the same as soft washing. It is the same machine, doing less of the same thing.

Here is the pattern I see most often in Central Connecticut. A driveway-and-patio pressure washing outfit adds “roof cleaning” to the service list because homeowners ask for it. They own exactly one type of equipment. So the roof gets cleaned with the driveway method, and the homeowner finds out eight months later when the streaks come back and the gutters are full of grit.

Assess the Damage: What You Can Check From the Ground Today

No ladders. Everything on this list can be done from the driveway or the attic.

• Check the gutters and downspout outlets. A handful of granules after any roof work is normal and always has been. A visible layer of granular sediment in the gutter trough, or granules piled at the splash block and washed into the driveway, is not. If a proper clean-out is overdue anyway, we handle gutter cleaning as part of most roof visits.
• Look at the roof in raking light. Early morning or late afternoon, when the sun is low. Scoured areas look duller and patchier, and sometimes read as shinier black where the mat is exposed.
• Look for a clean stripe pattern. Overlapping wand arcs show up as lighter bands running across the slope. That striping is the signature of a pressure wand and nothing else produces it.
• Look at the tab edges along each course. Lifted, wavy or misaligned tabs mean broken seal strips underneath.
• Check the ridge and hip caps. These are the most commonly dislodged pieces on a pressure-washed roof.
• Check the fascia, soffits and exterior light fixtures for water forced into places it should never have reached.
• Go into the attic on a bright day with the lights off. Look for daylight through the deck, damp sheathing, or wet insulation, particularly under the slopes that were worked on.
• Look at the landscaping below the work area. Burned or dying plants tell you about solution concentration and containment, which is a second story about how the job was run.

Write down what you find, with dates. You will need it.

The Warranty Problem: Deal With This Immediately

This is the part people skip, and it is usually the most expensive mistake they make.

Shingle manufacturers’ limited warranties typically exclude damage from improper maintenance, mechanical damage, and misapplication of cleaning methods. Pressure washing is a well-recognised route to a denied claim.

Step one: identify your shingle. Find the brand and product line from the roofing invoice, a home inspection report, permit records at the Town of Newington Building Department, or a leftover bundle wrapper in the garage. Plenty of Newington garages still have one.

Step two: read the actual warranty document before you contact anybody. Not a summary. The document.

Step three: do not let anyone clean, repair or alter that roof again until it has been photographed and documented. I have had homeowners call us to “fix it properly” the same week it happened, and I have had to tell them not yet. Re-treating the roof destroys the evidence of what was done to it. Document first, treat after.

Step four: if the roof is still inside a manufacturer’s warranty period, contact the warranty department in writing and ask what documentation they require. Do this before the original contractor comes back to make it right, because whatever they do next changes what the manufacturer sees.

Your Recourse in Connecticut, Step by Step

This is a general outline of the process in Connecticut, not legal advice. For anything significant, speak to an attorney or contact the Department of Consumer Protection directly.

1. Document before you confront. Dated photos, a video walk-around, a physical sample of granules in a sealed bag, the original quote, the invoice, and every text or email where the method was described. That last one matters more than people expect. If they wrote “soft wash” anywhere, keep it.
2. Get an independent inspection, not one the contractor arranges. A licensed roofing contractor’s written report with photos, stating the observed damage and the probable cause, is the single most valuable document you can obtain. Expect to pay for it. It is worth every dollar.
3. Verify the contractor’s registration. Residential home improvement work in Connecticut requires registration with the Department of Consumer Protection under the Home Improvement Act (CGS Chapter 400). Check the HIC number at eLicense.ct.gov. The HIC number is required to appear on contracts and advertising, and contracts missing required elements can be unenforceable against the homeowner.
4. Request their certificate of insurance. A legitimate contractor carries general liability coverage. Ask for the COI and the carrier’s claim contact. Property damage caused by a contractor is normally pursued against their liability policy, not your homeowners policy.
5. Notify in writing, not by phone. Email plus certified mail. State the facts, attach the photos and the independent report, state clearly what you want (repair, a contribution toward replacement, or a refund), and give a reasonable deadline. Phone calls leave no record and go in circles.
6. If they do not resolve it, file a complaint with CT DCP. DCP enforces the Home Improvement Act and investigates complaints against registered contractors.
7. Understand the Home Improvement Guaranty Fund. It exists to reimburse homeowners who obtain a judgment or restitution order and cannot collect from a registered contractor, or from one who was registered within two years of the contract date. The eligibility conditions are specific, so read the DCP page carefully rather than assuming you qualify.
8. Know the court options. Connecticut Small Claims Court handles claims up to $5,000. Larger claims go to Superior Court. Home improvement violations can also be actionable under the Connecticut Unfair Trade Practices Act (CUTPA), which is a term you may see referenced. For anything substantial, talk to an attorney.
9. Leave the review last, and leave it factual. A calm, specific, photo-supported review is more useful to you and to the next homeowner than an angry one. It also does not compromise your position if the matter goes further.

If you want a second set of eyes before you contact anyone, we will walk the property and give you a written, photo-documented assessment. Call Roman at (860) 263-9031.

Can the Damage Be Repaired?

Here is the honest version, which is not always the version people want.

The outcome most homeowners actually face is this: the roof does not leak tomorrow, and it may not leak for years. But its remaining service life has been shortened, and that lost life is the real damage.

That framing matters for any claim you make. You are not claiming a leak. You are claiming premature aging of a building component with a defined expected lifespan.

How to Hire Correctly Next Time

Six questions, with the answers you should be getting.

1. Is this a soft wash or a pressure wash? On shingles, soft wash. Always. No exceptions worth having.
2. What pressure at the surface? Low, roughly hose pressure. If the answer is a number in the thousands, walk away.
3. What is your CT HIC registration number? Given readily, without hesitation, and verifiable at eLicense.ct.gov.
4. Are you registered with CT DEEP as a pesticide application business, and who is your certified applicator? Applying a biocide commercially in Connecticut falls under DEEP’s Pesticide Management Program (CGS §22a-61(a) and §22a-66c(a)). Almost no homeowner knows to ask this, which is exactly why it belongs on your list. The reaction you get is informative all by itself.
5. Can I see your certificate of insurance? Provided without any resistance.
6. How do you protect landscaping and control runoff? Pre-wetting, covering, and an awareness that Newington’s storm drains discharge under the CT DEEP MS4 permit. If they have never thought about where the rinse water goes, they have not thought about your shrubs either.

One more thing, and it is the reason we structure our business the way we do. On a Mr-Suds job, Roman is on site. There is no crew standing on your roof making pressure decisions on their own while the owner is across town on another job.

Where High Pressure Is Actually the Right Tool

Worth saying clearly, because this article is not an argument against pressure washing.

High pressure belongs on concrete driveways, walkways, pavers, and certain hardscape surfaces where the material can take it and the dirt is embedded. That is real work and it is done with real machines. You can see the range on our pressure washing services in Hartford.

Shingles and siding are a different category of material, whether the growth on them is algae or moss. Porous, layered, sealed, and designed to shed water in one direction only. That is where soft washing exists, and the two methods are not interchangeable no matter how the invoice is worded.

FAQs

Can pressure washing damage a roof? Yes. Granule loss, broken seal strips, water intrusion under the courses, and cracked or torn shingles are all documented outcomes.

How do I know if my roof was pressure washed instead of soft washed? Granules in the gutters and driveway, wand-arc striping across the slope, and lifted or wavy tab edges. Any two of those together is a strong indicator.

Does pressure washing void a shingle warranty? It commonly falls under improper maintenance or mechanical damage exclusions. Read your specific warranty document, because the wording varies by manufacturer and product line.

Will my homeowners insurance cover contractor damage? Damage caused by a contractor is generally pursued against the contractor’s liability policy rather than your own. Call your agent before you file anything.

How do I file a complaint against a contractor in Connecticut? Through the CT Department of Consumer Protection. Verify the contractor’s registration first at eLicense.ct.gov.

Can granule loss be repaired? No. There is no product that restores granules. Affected shingles can only be replaced.

How much granule loss is normal after roof work? A small amount always sheds, especially on an older roof. Layers of granular sediment in the gutters are not normal and are not something to accept as routine.

Should I get the roof re-cleaned properly right away? Not until the damage is documented and, if applicable, the manufacturer has told you what they need. Once you clean it again, the evidence is gone.

Get a Written, Photo-Documented Assessment

You have already dealt with one contractor who did not explain what they were doing. We will not add to that.

Come to us for the assessment, not the pitch. We will walk the property, photograph what we find, and put it in writing so you have something usable whether or not you ever hire us. If the right next call is a roofer or DCP rather than a cleaner, that is what the report will say.

See our roof soft washing work in Hartford and Newington, real before and after results, and what Central CT homeowners say.

Get a Free Quote or call (860) 263-9031

Veteran owned. Licensed, bonded and insured. HIC registered. Soft wash only on shingles and siding. Owner-supervised on every job. Serving Newington, Hartford, Wethersfield, Rocky Hill, Glastonbury and Central Connecticut.