A roof is one of the most noticeable features of any home or building — especially when it’s a beautiful tile roof. In New Zealand, tile roofs are highly valued not just for their stunning earth tones but also for their durability. Compared to traditional asphalt shingles, tile roofs can last decades longer when properly maintained.
But when it comes to cleaning, many homeowners make one costly mistake: pressure washing.
Here’s why Exterior Washing Services in Rotorua and the Bay of Plenty does not recommend pressure washing tile roofs — and what safer alternatives we offer instead.
While pressure washing might seem like a fast and effective solution for removing moss, mold, and dirt, it can cause more harm than good. Here’s what high-pressure washing can do to your roof:
Etch and weaken the tile surface, making it more porous.
Strip away protective coatings and sealants.
Compromise underlayment and waterproof flashings.
Reduce the lifespan of your roof significantly.
Void manufacturer warranties.
In short — pressure washing may give instant results, but it sets you up for long-term roof damage and expensive repairs.
Most tile roof manufacturers clearly state that pressure over 1,200 psi can damage tiles — voiding any existing warranty.
The underlayment is essential for waterproofing your roof. High-pressure jets can penetrate this barrier, creating potential leaks and internal water damage.
Pressure washing can dislodge metal flashings, allowing rainwater to enter and cause structural problems.
This creates micro-crevices where algae, lichen, and moss can quickly regrow — meaning more maintenance and faster deterioration.
Tile roofs may look worse over time due to colour degradation caused by pressure washing — your roof ends up looking dull instead of revitalised.
With our wet climate and frequent storms, homes across Rotorua, Tauranga, Whakatāne, and Taupō are especially vulnerable to moss, algae, and water damage. A single cracked or etched tile is all it takes for water to seep in — leading to major repair bills.
We offer safe, effective, and non-damaging roof cleaning solutions throughout Rotorua and the Bay of Plenty region:
This gentle technique uses soft water flow and targeted biodegradable solutions to clean the roof without damage. Ideal for removing stubborn buildup without harming the tile integrity.
For sensitive or older tile roofs, we use soft brushes paired with non-toxic cleaning agents to remove moss and debris by hand. It’s thorough, safe, and kind to your roof and the environment.
After cleaning, we apply roof treatment solutions that kill algae and moss at the roots and protect your tiles from future growth. It’s like a shield for your roof — prolonging its life and beauty.
Most pressure cleaning companies aren’t trained, certified, or insured to work on roofs. They can leave you with a damaged roof and no accountability.
With Exterior Washing Services, you’re trusting qualified professionals who understand roof safety, building materials, and long-term protection strategies.
If your tile roof needs a refresh, don’t risk it with pressure washing. Let our experts in Rotorua and Bay of Plenty inspect your roof and recommend the safest cleaning method for your property.
✅ Residential & Commercial
✅ Tile Roofs, Colorsteel, and More
✅ Moss, Mold & Lichen Removal
✅ Eco-Safe Products
✅ Gutter Cleaning & Roof Treatments Included
📍 Servicing: Rotorua | Tauranga | Whakatāne | Taupō
📞 Call Now: 020 4785 061
📩 Email: sales@exteriorwashing.co.nz
🌐 www.exteriorwashing.co.nz
Let’s protect your investment and keep your home looking its best — the safe and professional way.
