How Wet Weather Affects Different Types of Roofs: Metal, Cement, and Terracotta

Wet weather is a common challenge for homeowners, especially in regions like Sydney, where heavy rainfall and storms can significantly impact the structural integrity of roofs. Your roof is your home’s first line of defense against the elements, and understanding how wet weather can affect different roofing materials—whether it’s metal, cement, or terracotta—can help you maintain the longevity of your roof.

At Roof Ranger, we’ve seen how various types of roofing materials respond to wet weather. Below, we’ll take a closer look at the pros and cons of metal, cement, and terracotta roofs during rainy conditions, and provide some tips on how to ensure your roof stays in top condition through all seasons.

Metal Roofs: Durability with a Few Considerations

Pros:

• Corrosion Resistance: Modern metal roofs are designed to be highly resistant to rust and corrosion, thanks to protective coatings like zinc or galvanised finishes. This makes them a popular choice in areas prone to frequent rain and storms.
• Quick Water Drainage: Metal roofs have smooth surfaces that allow water to run off quickly, preventing water accumulation, which could otherwise lead to leaks. This is particularly useful in regions with heavy downpours.
• Lightweight and Durable: Metal roofing is lightweight yet strong, able to withstand extreme weather conditions, including high winds and heavy rains.

Cons:

• Noise During Rain: One of the downsides of metal roofs is the noise during heavy rain. The sound of raindrops hitting a metal roof can be loud, which may be bothersome for some homeowners.
• Potential for Rust: While modern coatings prevent rust, metal roofs that have aged or have been damaged may develop rust if exposed to prolonged moisture. Ensuring that the protective coatings are well-maintained is crucial.

Maintenance Tips:

• Check for Scratches or Damaged Coatings: Even small scratches can lead to rust if left untreated. After significant storms, inspect your roof for any signs of damage or wear to the protective coating.
• Clean Regularly: Remove debris, such as leaves or branches, that can trap moisture and accelerate the deterioration of the metal surface.

Cement Roofs: Sturdy but Prone to Cracks

Pros:

• Long Lifespan: Cement tiles are known for their durability, often lasting for decades with proper maintenance. They are heavy and solid, providing excellent protection against severe weather.
• Resistant to Rot and Algae: Unlike some materials, cement is highly resistant to rot, mold, and algae growth, making it a solid choice for wet climates.

Cons:

• Susceptible to Cracks: Cement tiles can crack under the pressure of heavy rain or hail, especially as they age. Even small cracks can lead to leaks, which are exacerbated by prolonged exposure to wet weather.
• Heavy Weight: Cement roofs are significantly heavier than metal or terracotta, and while this can be an advantage for weather resistance, it can also pose structural challenges if the building framework isn’t designed to support the extra weight.

Maintenance Tips:

• Inspect for Cracks: After wet weather, regularly check for cracks in the tiles. Addressing even small cracks early can prevent costly water damage.
• Ensure Proper Sealing: Make sure the tiles are properly sealed, especially where they join at the ridges or around chimneys. Water can seep through improperly sealed areas, leading to leaks.

Terracotta Roofs: Beautiful and Resilient but Requires Care

Pros:

• Natural Water Resistance: Terracotta tiles are naturally resistant to water, making them a good option for wet climates. Their non-porous surface helps to prevent water absorption, protecting the underlying structure from damage.
• Aesthetic Appeal: Terracotta roofs are known for their classic, timeless beauty. They are also available in a variety of finishes that can enhance water resistance.

Cons:

• Fragility Under Heavy Impact: Terracotta tiles can break under the weight of heavy debris or large hailstones, which can occur during storms. Cracks or breakages in tiles can lead to leaks.
• Moss and Algae Growth: In consistently wet conditions, terracotta roofs can become prone to moss or algae growth. While this doesn’t necessarily damage the tiles, it can affect their appearance and may increase the chance of leaks over time.

Maintenance Tips:

• Keep Tiles Clean: Regularly remove moss, algae, and debris that can build up after rain. This not only improves the appearance of your roof but also reduces the likelihood of water getting trapped under the tiles.
• Check for Broken or Loose Tiles: Inspect your roof after heavy storms for any tiles that may have become loose or broken, as these can allow water to seep into your home.

How to Protect Your Roof During Wet Weather

Regardless of the type of roof you have, regular maintenance and professional inspections are essential to ensure your roof remains in good condition throughout the rainy season. Here are a few general tips to protect your roof during wet weather:

1. Inspect Gutters and Downpipes: Make sure your gutters and downpipes are clear of leaves, dirt, and other debris. Blocked gutters can cause water to back up onto your roof, leading to leaks.
2. Seal Flashing and Vents: Flashing around chimneys, vents, and skylights is a common weak point for water ingress. Ensure that all flashing is properly sealed and in good condition.
3. Professional Roof Inspection: Have a professional roofing contractor inspect your roof at least once a year, preferably before the rainy season. They can identify and fix any potential issues before they turn into bigger problems.
4. Repair Damage Promptly: If your roof suffers any damage during a storm, be sure to repair it as soon as possible to prevent further water damage to your home’s interior.

Different roofing materials—metal, cement, and terracotta—each have their own strengths and weaknesses when it comes to wet weather. By understanding how your roof type responds to rain and storms, and by taking the necessary precautions and maintenance steps, you can ensure your roof remains durable and effective throughout the wet season.

At Roof Ranger, we specialise in roof repair, restoration, and maintenance, helping homeowners protect their investment and keep their roofs in optimal condition. With over 30 years of experience in all aspects of roofing, our team is equipped to handle any type of roof, ensuring that your home stays safe and dry no matter what the weather brings. If you’re concerned about how your roof will hold up this rainy season, contact us today.