Roof Treatments

Professional Roof Treatments

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Roof looking mouldy and dirty? Roof treatments are the most cost effective way to clean a roof that has established moss, mould and lichen. Roof treatments are applied to all areas of the roof with low pressure equipment. Our treatment bonds to the roof surfaces and to the mould and has a cleaning effect that lasts for up to 2 years.

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What’s Included?

HWNZ offer full service exterior cleaning. So, if you require more than just a roof treatment, we can discuss other areas such as house wash, gutters and surrounding property at your request.

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Benefits of
Roof Treatments

Roof treatments offer several advantages, providing protective and aesthetic benefits for your roofing system. Here are the key advantages of roof treatments:

  • Moss and Algae Prevention: Roof treatments can prevent the growth of moss and algae on the roof. This helps maintain the roof’s appearance and structural integrity.
  • Cost Savings on Repairs: Proactive roof treatments can help identify and address issues early, potentially saving on the costs of more extensive repairs or premature roof replacement.
  • Preserve Roof Warranty: Following recommended roof treatments can help preserve the warranty of roofing materials, ensuring that the manufacturer’s guidelines for maintenance are met.
  • Increases property value: A well-maintained roof is an attractive feature to potential buyers and can increase the resale value of your property. Regular roof treatment can help protect your investment and make your home more appealing to prospective buyers.
  • Enhances curb appeal: A clean and well-maintained roof can greatly improve the appearance of your home. Regular roof treatment can help remove unsightly stains and discolouration caused by algae, moss, and other contaminants, giving your home a fresh, clean look.

Officially #1 Rated
in Auckland

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Our Reviews

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Very professional from start to finish!
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He and his team use professional equiment.
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I trust these guys completely and will only use them going forward
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Very thorough work and great communication throughout
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Will I use them again! ABSOLUTELY!!
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Absolutely blown away by Mangala's quick turn around time, efficiency, and professionalism
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Very quick in his response to our enquiry, friendly and knowledgeable
★ ★ ★ ★ ★
I have to say that Mangala is very professional

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Trusted to Wash
New Zealand’s Best

Why is HWNZ is the preferred option for exclusive property in NZ? We have team leaders on every job site. We pride ourself in service, safety and exceptionally clean results. We are officially the highest rated exterior operator in Auckland with over 200 5 Star Google Reviews.

Come Home to

For more than 6 years, HWNZ has earned a name for quality and customer service. The property owners we serve rely on us for detail-oriented, consistent cleaning services, every single time we wash their homes and businesses.

Here to Serve

With the right team and the right experience, our team is fully equiped to serve you with the best service and the best results.

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The Right Equipment
The Right Team

Call us now to discuss your requirements and receive a no obligation, free quote.

The Process of
Roof Treatment

Moss, mould and lichen can damage your roof if left untreated. Let us improve the appearance of your building and help you safeguard against future damage.

The steps we follow are:

  • Application of an eco-friendly biocide at low pressure to your roof surface. It is important to apply it at low pressure so that no water enters your roof structure. The biocide works over a 3 to 6 month period depending on the roof material and the extent of the moss, mould or lichen infestation.
  • We can usually do this work without actually going on the roof, preventing any further damage to the roof.
  • We will come back after 6 months to re-inspect your roof giving you peace of mind that the treatment is 100% effective.

We guarantee our work for one year!

The Right Tools
for the Job

Exterior cleaning requires not only care and attention to detail, but the right tools for each specific washing task.

HWNZ invest in the right equipment to run any exterior job efficiently and safely. Our fleet of hybrid vehicles keep our carbon footprint as low as possible and the correct size machines power through work safely and thoroughly.

Our pure water systems leave you with a better, spot free result on any windows that need cleaning and our extension equipment get to all those hard to reach spots effectively.

We invest in the right equipment so you don’t have to worry about the pain of maintenance and equipment that doesn’t go to good use. Call the HWNZ team for a free Quote

Our Equipment

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Building washing vans - House Wash New Zealand
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Pressure meter
Building washing vans - House Wash New Zealand
Building washing equipment - House Wash New Zealand
House washing vans - House Wash New Zealand
Pressure meter


Over time, moss and mould can grow on your roof, causing damage to the shingles and other roofing materials. Additionally, the growth can also cause water damage and potential health hazards. Roof moss and mould treatment services can help prevent these issues and keep your roof in good condition.

Roof treatment service typically includes applying a specialised solution to kill and remove the moss and mould, cleaning the roof surface, and preventing future growth with a protective coating.

Signs that your roof may need moss and mould treatment include the presence of moss or mould growth on the roof surface, water damage to the ceiling or walls, and a musty smell in the attic or living spaces.

Yes, roof treatment service is safe for your house when performed by a professional. A professional roof moss and mould treatment service provider uses specialised equipment and techniques to ensure that the treatment is done safely and without causing any damage to your roof or house.

The frequency of roof moss and mould treatment depends on various factors, such as the climate in your area and the amount of tree coverage around your house. Generally, it is recommended to get your roof treated every 2-3 years, but some houses may require more frequent treatment.

The cost of roof moss and mould treatment service depends on various factors, such as the size of your roof, the level of cleaning required, and the location of your house. It is best to get a quote from a professional roof moss and mould treatment service provider to determine the exact cost.