Is Power Washing Asphalt Shingles Safe? Roofing Experts Weigh In
Is Power Washing Asphalt Shingles In
Arlington, VA, Safe? Here’s What
Homeowners Need To Know
The Roofing Experts At Shiner
Exteriors Weigh In
Maintaining your home’s curb appeal is essential in a place like Arlington, VA. And with asphalt shingles, you have to be proactive.
Our region’s leafy streets, historic architecture, and rapidly changing seasons all play a role in your property’s appearance. Especially when you live in the same region as the famous Arlington National Cemetery.
As homeowners seek ways to keep their asphalt shingle roofing clean and free of dark streaks or moss, one question often arises: Is power washing asphalt shingles safe?
The short answer is no, power washing is generally not safe for asphalt shingles. But understanding why it’s unsafe – and what the alternatives are – will help you protect your home’s longevity and value.
Why Asphalt Shingles In The Suburban Maryland Area
Require Special Care
Across the US and in Arlington, VA, asphalt shingles are the most common roofing material due to their affordability, durability, and ease of installation. However, they are not designed to withstand the intense pressure of a traditional power washer.
Here’s what makes asphalt shingles vulnerable:
- Granule coating: These tiny mineral granules are embedded in the surface of shingles to protect against UV rays and weathering. High-pressure water can dislodge them, accelerating roof wear.
- Layered construction: Asphalt shingles are layered and sealed together. Water sprayed at high pressure can loosen these layers, break the seal, or even lift and tear the shingles.
- Water infiltration risk: Power washing can force water underneath the shingles and into the roof deck, potentially causing leaks, wood rot, and mold growth.
Factoring In Arlington, VA’s Climate
Regarding Roofing Materials
The humid subtropical climate in Northern VA wears down roofing materials. Asphalt shingles are particularly susceptible to algae, moss, lichen, and mildew – especially on north-facing slopes or shaded roofs. These organisms can stain your shingles and gradually degrade them if left untreated.
Many homeowners assume that power washing is the quickest solution to remove these stains. While it may look effective temporarily, the long-term damage far outweighs the short-term aesthetic benefits.
Safer Alternative To Power Washing: Soft
Washing Your Asphalt Shingles
The recommended method for cleaning asphalt shingles is soft washing – a low-pressure system combined with specially formulated cleaning solutions.
What Is Soft Washing?
Soft washing uses a gentle stream (typically under 100 PSI) to apply a biodegradable cleaning solution that kills and loosens algae, moss, and mildew. After an appropriate dwell time, the roof is gently rinsed with water or simply left for rain to rinse naturally over time.
Benefits of Soft Washing
- Preserves granules and shingles: No harsh force means your roofing materials stay intact.
- Thorough cleaning: Soft washing targets the root of the problem by eliminating spores and organisms – not just surface stains.
- Manufacturer approved: Most asphalt shingle manufacturers, including GAF and CertainTeed, endorse soft washing as the only approved cleaning method.
Signs Your Asphalt Shingle Roof Needs
Cleaning (Not Power Washing)
Before you consider any type of roof cleaning, look for these common signs:
- Black streaks running down the roof (algae)
- Uneven coloration or dullness from dirt buildup
- Green clumps or fuzzy patches (moss or lichen)
- Debris like pine needles or leaves lodged in valleys
If you notice these, it’s time to call in a roofing professional or certified soft washing expert – not reach for a power washer.
DIY vs. Professional Cleaning Your Roofing Materials
While DIY roof cleaning may be tempting, it’s not recommended for several reasons:
- Safety concerns: Roofs are dangerous, especially when slippery from algae or water.
- Chemical handling: Using the wrong type or concentration of cleaning solution can damage shingles or harm nearby landscaping.
- Insurance risks: Improper cleaning methods may void your roof warranty or home insurance coverage.
Hiring a professional with experience in soft washing ensures the job is done safely, effectively, and without damage.
Local Regulations and Environmental Concerns
When It Comes To Asphalt Shingle Roofing
When you need roofing services in Arlington, VA, it’s crucial to keep in mind that our city has strict stormwater management guidelines to protect local waterways like Four Mile Run and the Potomac River. Professional soft wash companies often use environmentally responsible detergents and take care to avoid runoff into storm drains.
If you’re hiring someone for roof cleaning, ask whether they comply with local environmental practices and are licensed for chemical application.
Final Verdict: Skip the Power Washer
On Your Asphalt Shingles
To summarize:
- Power washing asphalt shingles is not safe – it can cause physical damage and shorten roof lifespan.
- Soft washing is the safe, effective, and manufacturer-approved method to clean algae, moss, and stains.
- In Arlington’s climate, soft washing offers long-term roof protection while maintaining your home’s visual appeal.
- Always work with a reputable, local professional who understands the specific roofing needs of Northern Virginia homes.
Your roof is one of your home’s most important investments – treat it with the care it deserves. If your shingles are looking worse for wear, don’t reach for the pressure washer – reach for your phone and call a trusted roof cleaning expert instead.
If you’re ready for new asphalt shingles in Arlington, VA, call the pros at Shiner Exteriors today to get started!
