Your roof works hard to protect your home from the elements, be it sun, rain, snow, or hail. However, over time, dirt, algae, and other debris can cover your once-spotless roof and quickly degrade the appearance of your home. The unsightly moss and algae not only detract from the beauty of your property but could also lead to potential long-term damage.
Fortunately, a pressure washer can help you restore your roof to its former glory in no time. Pressure washing will save you the hassle of tedious scrubbing, as the powerful jets will do their magic and clean your roof in a fraction of the time.
But here’s the catch: not knowing the right pressure-washing technique can turn a roof-cleaning task into a messy disaster. So, keep reading as we guide you through the process of pressure washing your roof safely and effectively.
What Are the Benefits of Pressure Washing a Roof?
Pressure washing your roof can be beneficial in several ways. Here are some of the advantages of pressure washing your roof:
Increasing the Curb Appeal
A roof makes up 40% of a home’s visual exterior, so a dirty roof can quickly reduce your home’s curb appeal. If you try to sell a home with a stained roof, chances are potential buyers will not be impressed, as they’ll assume you haven’t taken good care of your property. Fortunately, pressure washing your roof can make it look new and help you maintain a good impression when potential buyers drive by.
Increasing the Roof’s Lifespan
If you let dirt, moss, and algae accumulate on your roof, they could potentially damage it. Algae can hold onto water, allowing it to seep into cracks and crevices in the shingles.
The impact is premature wear of the roofing material, resulting in costly repairs. Pressure washing your roof can remove dirt, moss, algae, and mold buildup that can take the life out of your roof.
Reducing Energy Cost
Algae and fungi on your dirty roof can absorb more heat because they have black pigmentation. As a result, they interfere with your roof’s reflective capabilities, causing your home to be less energy efficient.
Your air conditioners must work harder during higher temperatures, leading to higher energy bills. Pressure washing your roof removes these elements and improves its reflective capabilities, resulting in lower cooling costs.
Preventing Gutter’s Clogging
When dirt and debris accumulate on the roof, they can eventually find their way into your gutters. These materials can cause clogging, leading to water pooling in your gutter’s downspouts. Pressure washing gets rid of debris while allowing water to flow freely through the gutters, preventing damage caused by backed-up water.
Which Roofing Materials Can You Pressure Wash?
You can pressure wash most roofing materials, but you should be careful to avoid damaging them. Here are some of the most popular roofing materials that are ideal for pressure washing:
- Asphalt shingles
- Wood shingles
- Clay tiles
- Metal roofs
- Concrete tiles
- Slate roof.
Some roofing materials, such as asphalt shingles, wood shingles, and slate, are more fragile than others, so they can’t withstand high-pressure. In such cases, you should use a soft wash process with a PSI of less than 500 and a low-pressure nozzle to avoid compromising your roof.
Best Practices for Pressure Washing a Roof
Here are some things you should keep in mind when pressure washing a roof:
Choose the Right Cleaning Solution
Depending on your roof type, different cleaning solutions may be more effective than others. For example, if you have an asphalt shingle roof, use a mild detergent or soap designed for pressure washing roofs. If you have a tile or slate roof, you can use an alkaline-based cleaner instead.
It’s also important to ensure the cleaning solution is not too acidic or abrasive, as this could damage your roof. The cleaning solution should also be pressure-washer-safe, biodegradable, and not contain a high bleach concentration.
Follow Safety Procedures
Before attempting to pressure wash your roof, make sure that you wear protective gear such as gloves, goggles, and shoes with non-slip soles. Additionally, ensure the ladder is secure and steady before you climb up. It’s also best to have someone else standing by in case you need help.
Apply the Cleaning Solution
Apply the cleaning solution using a garden sprayer or pump-up sprayer. Allow the cleaner to stay on the surface for 10-15 minutes before beginning to pressure wash.
If your roof has mold or algae, let the cleaning solution sit for at least an hour before pressure washing. The aim is to give it enough time to penetrate the surface and loosen the mold, making it easier to clean.
Prepare the Work Area
Before beginning to pressure wash your roof, make sure that the surrounding area is well protected. Cover plants and other items with tarps or plastic, and move any outdoor furniture away from the work area.
Follow the Right Pressure Washing Technique
This is probably the most crucial step of the pressure-washing process. One mistake could cause serious damage to your roof, so following the right technique is vital. Here are the key things to remember:
Use a low-pressure setting: High water pressure can damage your roof, so make sure that you use a low-pressure setting of between 500-1200 PSI. Low pressure will prevent accidental damage to the roofing materials while effectively removing dirt and debris from the surface.
Use a wide-angle nozzle: A narrow nozzle will increase the pressure of the water, making it more likely to damage your roof. Instead, use a wide-angle nozzle with a 40-degree fan pattern to disperse the water evenly over the surface and avoid any concentrated pressure points.
Keep a distance from the surface: You should hold the nozzle at least eight inches from the roofing surface to avoid any accidental damage caused by water pressure.
Avoid aiming water upwards: Never aim your pressure washer upwards toward the roof, as this can push water underneath the shingles and cause them to tear off. Instead, point the nozzle downward at an angle. In other words, wash the roof in the shingles’ direction to ensure water flows over them, not underneath them.
Clean in Sections
It’s best to break down the roof into sections and focus on one section at a time for a thorough cleaning. Starting from the top of your roof, work in small rows while keeping the pressure washer nozzle moving and ensuring you don’t stay in one spot for too long. Cleaning in sections will help you keep track of the areas you have already cleaned and those that still require attention.
Be Careful Around Vents and Chimneys
When pressure washing around vents and chimneys on your roof, do not spray water directly into them, as you could cause water damage inside your home. Instead, use a brush attachment on your pressure washer to gently scrub away dirt and debris around these areas.
Rinse the Roof Thoroughly
Once you’ve finished pressure washing, rinse your roof thoroughly to ensure all the cleaning solution has been washed away before it dries. You can turn off the pressure washer and use a gentle stream of water from an ordinary garden hose to rinse the roof from top to bottom.
Allow the Roof to Dry and Check for Damage
Allow at least 24 hours for the roof to air-dry, and inspect it to ensure that pressure washing has caused no damage. Look for areas affected by the water pressure or where shingles may have come loose. If you come across any damaged sections, repair them as soon as possible.
Should You DIY or Hire a Professional?
DIY pressure washing is a great way to save money, but it can be risky if you don’t have the right tools or knowledge. After all, pressure-washing a roof is not easy and requires special equipment and expertise to avoid damage and accidents.
That’s why it’s best to hire a professional cleaning company to do the job for you. They can assess your roof and determine the best cleaning method for your home or business. Plus, they possess the right tools and equipment to clean your roof safely and effectively.
A professional cleaning company will clean your roof without causing damages such as:
- Breaking or cracking clay and slate roofs
- Stripping away asphalt shingles
- Creating air pockets between the roof and the sheathing
- Removing flashing or sealant
- Puncturing waterproof membranes
- Damaging gutters, downspouts, or other fixtures on your roof
- Compromising your roof’s underlayment, adhesives, and bonding agents
- Creating scratches or dents on metal roofs.
Plus, a professional will understand the right pressure washer settings and detergents to use on your roof.
Hire a Professional Pressure Washing Company
As you can see from this guide, pressure washing a roof is a challenging job. Besides being dangerous, it requires special tools and knowledge to do it right. That’s why hiring a professional pressure washing company is always best.
If you’re looking for an experienced cleaning company in Houston, TX, to help you with pressure washing your roof, Advantage Pro Services is a perfect choice. We have over 20 years of experience offering pressure washing and soft washing services to home and business owners in Houston. As such, we can pressure wash your roof and any other external surface to restore their shine without causing damage.Check out our website to see why we’re a good fit for all your pressure washing needs.
