Soft wash roof cleaning is a gentle, low-pressure method for cleaning roofs that effectively removes dirt, algae, mold, mildew, and other organic growth without damaging roofing materials.
Unlike power washing, which relies on high-pressure water, soft washing uses a specialized cleaning solution—typically a blend of water, bleach, and a surfactant—that breaks down and kills organic growth at its root.
This solution is applied with low-pressure equipment, which protects shingles, tiles, and other delicate surfaces from erosion or displacement. Soft washing not only cleans the roof but also helps prevent regrowth of harmful organisms, extending the life and appearance of the roof.
Keep reading to learn more about soft wash roof cleaning.
What Chemicals Are Used To Soft Wash Roofs?
The primary chemical used in soft washing roofs is sodium hypochlorite, a professional-grade bleach (usually around 12.5% concentration). It’s highly effective for sanitizing and killing organic growth like algae, mold, mildew, and moss at the root. Sodium hypochlorite is typically mixed with water to dilute it to a safer concentration, often in a 3:1 or 4:1 water-to-bleach ratio, depending on the level of staining and organic buildup.
In addition to sodium hypochlorite, a surfactant (or soap) is often added to the mix. The surfactant helps the solution stick to the roof surface longer, allowing it to penetrate and kill the organisms more effectively before it’s rinsed off. This combination ensures a thorough cleaning and reduces the likelihood of regrowth.
Is Soft Washing A Roof Worth It?
Yes, soft washing a roof is worth it for several reasons. This low-pressure cleaning method effectively removes algae, moss, mold, and grime without damaging the shingles or tiles, which is a risk with traditional high-pressure washing. Soft washing not only restores the roof’s appearance but also extends its lifespan by eliminating organisms that can degrade roofing materials over time. By killing mold and algae at the root, soft washing prevents regrowth, keeping the roof clean for 2-3 years, depending on the climate and environment. Additionally, a well-maintained roof can enhance curb appeal and property value, making soft washing a smart investment for homeowners.
How Long Does Soft Washing A Roof Last?
Soft washing a roof generally keeps it clean for 2 to 3 years, though the exact duration depends on several factors. Roofs in humid or shaded areas, where mold and algae thrive, may need cleaning closer to the 1-year mark, while those in sunny, dry climates can remain clean for up to 3 years. The type of roof material also matters—some materials, like metal, are less prone to algae and moss buildup than shingles. Professionals often apply algaecides during the soft washing process, which can further inhibit regrowth and extend the roof’s cleanliness.
How Do You Soft Wash A Roof?
To soft wash a roof, start by mixing a cleaning solution of water, sodium hypochlorite (bleach), and a surfactant to help it stick to the roof. Using a low-pressure sprayer, apply the solution evenly from the top down, allowing it to sit for 10–20 minutes to break down algae, mold, and grime. Then, rinse thoroughly with a garden hose or a low-pressure rinse to remove the solution and debris. Take care to protect nearby plants by rinsing them with water before and after, and wear protective gear throughout the process. Soft washing is a safe, effective method to clean roofs without damaging shingles or tiles.
How Often Should You Clean Your House Roof?
You should generally clean your house roof every 2 to 3 years. The exact frequency depends on factors like the local climate, roof material, and surrounding vegetation.
In humid or shaded areas where algae, moss, and mold grow quickly, annual cleaning may be necessary. In sunnier, drier regions, a thorough cleaning every 2 to 3 years is often sufficient.
Regular roof cleaning not only maintains curb appeal but also helps extend the life of the roof by preventing the buildup of organisms that can damage roofing materials over time.
Pressure Washing Vs Soft Washing A Roof
Pressure Washing vs. Soft Washing a Roof centers on the water pressure used and its impact on roof materials.
Pressure Washing involves high-pressure water (typically 1,500 to 4,000 PSI) to blast away dirt, moss, and grime. While effective on hard surfaces like concrete, this method is not suitable for roofs, especially shingle roofs. The intense pressure can strip away protective granules on shingles, loosen or dislodge shingles, and lead to water intrusion, causing potential leaks and structural damage.
Soft Washing, in contrast, uses low pressure (around 100-500 PSI) combined with a specially formulated cleaning solution, usually a blend of water, sodium hypochlorite (bleach), and a surfactant. This solution breaks down algae, mold, mildew, and dirt without damaging the roof materials. Soft washing is gentle yet effective for cleaning delicate surfaces like shingles, tile, or slate and kills organic growth at the root, reducing regrowth.
In summary, pressure washing is too harsh for most roofs and risks significant damage, while soft washing is a safer, longer-lasting method tailored to protect and maintain roof integrity.
Takeaway
Soft wash roof cleaning is a safe, low-pressure method that removes dirt, algae, mold, and mildew without risking damage to shingles or tiles. Using a specialized solution, soft washing targets organic growth at the root, effectively cleaning and preventing regrowth. This approach not only restores the roof’s appearance but also extends its lifespan, making it a smart, protective choice for homeowners.
