Commercial Roof Washing Experts New Zealand

Commercial roof washing is an essential service that on cleaning and maintaining the roofs of commercial buildings. It plays a significant role in preserving the integrity and appearance of the roof while also extending its lifespan. Let’s delve into some key points to consider when it comes to commercial roof washing:

exterior building washing Auckland

Roof Material

The type of roofing material used on commercial buildings is a crucial factor to consider when planning roof washing. Different materials require specific cleaning techniques and products to avoid any potential damage. Here are some common commercial roofing materials and their respective cleaning requirements:

  • Asphalt Shingles: This popular roofing material requires delicate care during cleaning to ensure that the shingles remain intact and undamaged.
  • Metal: Metal roofs are relatively easy to clean but can be susceptible to scratches. Therefore, it is important to use the appropriate cleaning method and avoid harsh abrasives.
  • EPDM (Rubber): Rubber roofs are highly durable but can be sensitive to certain cleaning solutions. Professionals should opt for gentle cleaning methods that won’t compromise the integrity of the material.
  • TPO and PVC: These synthetic single-ply membranes necessitate a unique approach to cleaning to prevent any premature deterioration.
  • Modified Bitumen: Cleaning modified bitumen roofs requires specialized techniques to avoid harming the surface and compromising its effectiveness.

Reasons for Roof Washing

Commercial roof washing serves multiple purposes, addressing various issues that can arise over time and affect the performance and appearance of the roof. Here are some key reasons why roof washing is necessary:

  • Moss and Algae Removal: The growth of moss, algae, lichen, and other organic matter on roofs can cause gradual deterioration. Roof washing effectively removes these unwanted elements, ensuring the roof remains in optimal condition.
  • Stain Removal: Dirt, pollution, and debris can leave unsightly stains on the roof’s surface, negatively impacting its aesthetic appeal. Roof washing eliminates these stains, restoring the visual appeal of the building.
  • Preventative Maintenance: Regular roof washing is an integral part of preventive maintenance. By proactively removing dirt, debris, and other contaminants, it helps prevent more severe damage and extends the lifespan of the roof.

Pressure Washing vs. Soft Washing

When it comes to commercial roof washing, professionals may utilise one of two main methods: pressure washing or soft washing. The choice between these techniques depends on the roof material and the type of contaminants present. Let’s take a closer look at both approaches:

  • Pressure Washing: This method utilises high-pressure water to dislodge and remove stubborn debris and stains from the roof’s surface. It can be an effective solution for roofs with durable materials such as metal. However, caution must be exercised, as excessive pressure can damage more sensitive materials.
  • Soft Washing: Soft washing involves using low-pressure water combined with specific cleaning solutions to safely and gently remove contaminants from the roof. This method is particularly suitable for roofs with materials like asphalt shingles, rubber, or synthetic membranes. It minimises the risk of damage while ensuring effective cleaning.
  • Commercial roof cleaning


Commercial roof cleaning can be a potentially hazardous task, primarily due to the necessity of working at heights. To prevent accidents and ensure the safety of everyone involved, it is crucial to prioritize safety measures. Here are some key considerations:

  • Fall Protection Equipment: Adequate fall protection equipment, such as harnesses, safety ropes, and guardrails, should always be used during roof washing operations.
  • Proper Training: All personnel involved in roof cleaning should receive comprehensive training on safety protocols, equipment usage, and best practices to minimize risks.
  • Professional Expertise: Hiring professional roof cleaning services is highly advisable. These companies have the necessary experience, expertise, and safety protocols to perform the job effectively and safely.

Professional Services

To ensure a successful and efficient roof cleaning process for commercial buildings, it is strongly recommended to hire professional roof cleaning services. These experts possess the necessary knowledge, equipment, and safety protocols to handle the task adequately. By relying on their professional services, you can rest assured that your commercial roof will receive the care and attention it deserves.

Environmental Considerations

While maintaining the cleanliness and integrity of your commercial roof is essential, it’s equally important to consider the environmental impact of the cleaning process. It is crucial to hire a company that follows eco-friendly practices and disposes of the cleaning chemicals responsibly. By doing so, you can minimize harm to the environment while still achieving exceptional results for your commercial roof.

Roof Inspection

Before commencing any cleaning activities, it is imperative to conduct a thorough inspection of the roof. This inspection enables the identification of any existing damage or areas that require repairs. Cleaning a damaged roof without addressing these issues can exacerbate problems, leading to even costlier repairs down the line. Therefore, it is vital to assess and address any necessary repairs before proceeding with the cleaning process.

Maintenance Schedule

To ensure the long-term effectiveness of commercial roof washing, establishing a regular maintenance and cleaning schedule is crucial. The frequency of roof cleaning depends on various factors, including the location, climate, and type of roofing material. By adhering to a consistent schedule, you can prevent excessive buildup of dirt, debris, and contaminants, ultimately extending the lifespan of your commercial roof.

Warranty Considerations

It is essential to check the warranty on your commercial roof if you have one. Some warranties may require regular cleaning and maintenance to remain valid. By adhering to the prescribed maintenance requirements, you can ensure that your warranty is upheld and protect yourself from incurring unnecessary expenses in case of unforeseen damages.


The cost of commercial roof washing can vary depending on several factors. These factors include the size of the roof, its overall condition, the specific cleaning method utilised, and the location of the building. Although there may be initial costs associated with professional roof cleaning services, it is a wise investment to protect the integrity and longevity of your commercial roof. The costs incurred for regular roof washing can save you from expensive repairs or premature roof replacement in the long run.


In summary, commercial roof washing plays a critical role in maintaining the appearance and functionality of commercial buildings. By understanding the specific needs of your roof material, choosing the appropriate cleaning method, prioritising safety, and relying on professional services, you can ensure that the roof remains in optimal condition. Regular maintenance, adherence to environmental considerations, and proper inspection instil confidence in the long-term performance of your commercial roof. Make the investment in commercial roof washing an integral part of your building maintenance plan, and reap the benefits of a well-maintained roof for years to come.

Request A Quote