Pressure washing a roof blasts away the protective ceramic granules on asphalt shingles and can force water under the underlayment, causing structural rot and leaks. High-pressure streams also easily crack fragile tile, strip paint off metal, and typically void manufacturer warranties.
While pressure washing can remove debris and growths, the high-pressure water stream can also cause damage to delicate roofing materials, such as shingles, tiles, and wood. If the pressure is too high or the wrong angle is used, it can cause the shingles to loosen, crack, or even break.
The 25% Rule in roofing serves as a guideline for both homeowners and contractors when planning roofing projects. Basically, it means that if more than 25% of your roof's surface needs repairs, it's often wiser to contemplate a full replacement rather than patchwork.
Despite the "50-year" or "lifetime" marketing, these asphalt shingles realistically last 25 to 35 years. The 50-year rating refers to a prorated manufacturer warranty against defects, not a literal lifespan promise.
Low Pressure (1000-1500 PSI): This is generally the recommended pressure range for cleaning roofs, especially asphalt shingles or delicate surfaces. Low pressure ensures that dirt, moss, and algae are removed without damaging the shingles or causing water to penetrate under them.
These are the 5 most commonly used ways to get rid of moss from roofs.
For a 2,000 square foot house, you should typically charge between $300 and $600 for a professional pressure wash in 2026. Pricing usually ranges from $0.10 to $0.50 per square foot, with common rates falling around $350–$450 for a standard, single-story house, and higher for complex or two-story homes.
To tell if a roofer is lying, watch out for high-pressure sales, suspiciously low bids, and demands for large upfront cash payments. Honest roofers provide clear, detailed contracts and verifiable credentials. Always check their local license, avoid signing contingency agreements before fully committing, and get a second opinion.
Generally, the late fall and winter months can be the most cost-effective times to schedule a roof replacement. This is typically the slow season for roofing contractors, and as business wanes, you might find that they are more willing to negotiate on price.
About 1 in 3 people in the U.S. will develop shingles in their lifetime. For adults over 50, the risk increases sharply because the immune system naturally weakens with age. Each year, roughly 1 in 100 unvaccinated adults aged 50 and older will get shingles, and this rate climbs even higher for those over 60.
Neutral and timeless roof colors like black, charcoal, gray, and brown consistently deliver the highest return on investment. These classic shades have universal appeal, seamlessly match nearly all architectural styles, and attract the widest pool of potential buyers.
There are specific phrases that consistently cause problems. Saying “my roof was already damaged before the storm” gives the adjuster a reason to classify damage as pre-existing. Admitting fault with “I think it might be my fault” shifts liability onto you.
The best shingle brand depends on your priorities, but industry leaders consistently highlight CertainTeed, GAF, and Owens Corning for their longevity, warranties, and nationwide availability. For cutting-edge materials and eco-conscious options, Malarkey Roofing Products is highly recommended.
DON'T use a pressure washer, which can loosen shingles and seriously damage your roof. DO use a sprayer attached to a garden hose that's filled with equal parts chlorine bleach and water of laundry strength liquid chlorine bleach and water. This is the best way to clean a roof with asphalt shingles.
Autumn can also be a suitable time for pressure washing, particularly for removing fallen leaves, dirt, and algae that may have built up during the summer. It's essential to ensure that your home remains clean and inviting before winter arrives.
If your roof is newer and made of durable materials, like metal or slate, your homeowners policy may cost less than if you have an older roof — which may be more susceptible to damage and a risk for homeowners insurance companies. In some cases, your insurer may inspect your roof before issuing a policy.
What damages the roof the most? Sun exposure, poor maintenance, and severe weather like hailstorms and strong winds do the most damage.
A 20-year-old roof is officially entering "borrowed time" if it is made of standard 3-tab asphalt shingles. While it isn't automatically too old if it's an architectural shingle, metal, or tile roof, standard asphalt roofs typically need replacement between 15 to 25 years.
For a 2,000 square foot home with asphalt shingles, the installation typically takes 2-3 days, while the entire process from planning to completion usually spans 2-3 weeks.
What Should You Not Say to a Contractor?
Best Time to Pressure Wash Your House
Late spring, after the pollen has settled down, is the perfect time to pressure wash your home. Since pressure washing requires closely examining your home's siding, it's also a great time to inspect the exterior of your home for rot, pest invasions, and areas that need attention.
Move any items you don't want to get wet or things like potted plants that you may damage. Mind any toys, gardening equipment or recreational items that will be in your way and create a tripping hazard.