Why Are My Roof Tiles Turning Green?

• July 25, 2024
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So, why are my roof tiles turning green?

If you’ve noticed a greenish tint appearing on your roof, you’re likely seeing moss or algae growth.

This common issue occurs due to moisture accumulation, often in shaded or damp areas.

Moss and algae thrive in these moist environments, especially on porous materials like roof tiles. Don’t worry, though; it’s a problem that can be managed!

Keep reading to learn more about why this happens and what you can do to clean and prevent future growth.

Need help with your roof ? We’re here to assist you, we offer outstanding roof repairs in Canberra.

Why Are My Roof Tiles Turning Green?

The green discoloration on roof tiles is typically caused by moss or algae growth.

This growth is often seen in areas that receive less sunlight and retain moisture. This creates an ideal environment for these organisms to thrive.

Factors contributing to this include;

• Humid climate conditions
• Excessive shade from trees, and
• North-facing slopes that receive limited sunlight.

Poor air circulation and debris accumulation on the roof can also promote the growth of moss and algae, leading to the green tint you see on the tiles.

Can Green Moss Affect Your Roof?

In case you aren’t aware; green moss and algae growing on your roof can cause various negative effects.

Let’s take a quick look at some of them so you know how important it is to keep these organisms off your roof.

#1: Structural Damage

Green moss can significantly impact the structural integrity of your roof.

Moss tends to hold moisture against the roof surface, which can lead to the deterioration of roofing materials, especially wood and asphalt shingles.

Over time, this persistent dampness can cause the roof deck to rot and the shingles to warp, potentially leading to leaks and a weakened roof structure.”

#2: Appearance

The presence of green moss can significantly detract from the aesthetic appeal of your home.

Mossy roofs may appear neglected or old, impacting the overall look of your property.

#3: Blocked Gutters

Moss growth can extend beyond the roof tiles and invade the gutter system, leading to blockages.

When gutters are clogged with moss, water cannot flow freely, causing overflow and potential water ingress into the home.

This can result in water damage to the roof edges, fascia boards, and even the interior walls.

#4: Home Value

In case you are planning to make money out of your home soon – either by selling or renting out, you should know moss is not your friend.

Moss growth can negatively impact the value of your home.

Potential buyers may see a moss-covered roof as a sign of poor maintenance and anticipate additional costs for cleaning or repairs, which could lower the property’s market value.

#5: Health Complications

Moss and algae on roofs can contribute to poor indoor air quality if they lead to mold growth inside the home.

Mold spores can trigger allergies, asthma, and other respiratory issues, particularly in children and the elderly.

You definitely don’t want these health risks. So, let’s talk about how to stop roof tiles from going green in the first place.  

How to Stop Roof Tiles from Going Green

• Remove Debris: Regularly cleaning your roof to remove leaves, twigs, and other debris can help. This reduces the moisture and shade where moss likes to grow.
• Trim Your Trees: Cut back overhanging branches to reduce shade and moisture on your roof. More sunlight can help keep the roof dry and discourage moss growth.
• Get the Roof Professionally Cleaned: Consider hiring professionals to clean your roof periodically. They can remove moss and algae effectively and apply preventive treatments to inhibit future growth.
• Consider Copper-Infused Asphalt Shingles: If you’re considering a new roof, look into copper-infused asphalt shingles.

Copper has natural antimicrobial properties that can prevent algae and moss from growing.

Fitting Copper on the Roof Can Also Help!

Fitting copper wire on your roof is also an effective method to prevent moss growth.

Copper naturally releases ions that are toxic to moss, algae, and other organic growths, keeping your roof clean and attractive.

Most homes will only need a single strip to repel moss and stop it from taking hold.

Here are the steps to follow for fitting copper on your roof:

1. Clean Your Roof: Start by removing any existing moss or debris to ensure the copper contacts the roof surface directly.
2.  Position the Copper Strip: Place a copper strip at least 2 inches wide along the top ridge of your roof, ensuring it’s close to the peak for maximum effectiveness.
3. Secure the Strip: Tuck the strip into the ridge, allowing a small part of it to be exposed. Secure it in place using copper nails to prevent corrosion and ensure longevity.

This method not only helps keep your roof moss-free but also extends the life of your roofing materials by preventing biodegradation.

How Do You Get Rid of Green Algae on Your Roof?

• Use a Moss Remover and Algae Cleaner: Opt for a cleaner specifically designed for roofs to avoid damaging the shingles or tiles. Apply it according to the manufacturer’s instructions.
• Soft Washing: Instead of pressure washing, which can damage roofing materials, use a soft wash technique. This involves applying a cleaning solution with a low-pressure sprayer to kill and loosen the algae or moss.
• Brushing Off the Debris: Once the solution has done its work, gently brush off the moss or algae with a soft-bristle brush. Start from the top and work your way down to avoid lifting shingles.
• Preventative Treatments: After cleaning, consider applying copper strips at the roof’s peak to prevent moss and algae regrowth.

Why Are My Roof Tiles Turning Green – Final Note

Dealing with green algae or moss on your roof can be daunting.

However, taking action is crucial to maintaining the health and appearance of your home.

If your roof is turning green, don’t wait for the problem to worsen.

Consider implementing the cleaning and prevention methods we’ve discussed, and remember, help is just a call away.

If you need professional advice or assistance with your roof, don’t hesitate to contact us for roof inspection in Canberra or Melbourne. We’re here to help you keep your roof in top condition.

Disclaimer: There are serious risks involved in conducting repairs yourself, you should hire a skilled roofer for repairs.