Common Roofing Materials in Brisbane

The Pros and Cons of Common Roofing Materials: A Detailed Guide

When it comes to choosing the right roofing material for your home, there are several options available, each with its own advantages and disadvantages. In Queensland, roof replacements or repairs require careful consideration, especially if your roof has been damaged by a storm or other external factors. Whether your roof consists of Decramastic tiles, asbestos, metal corrugated sheets, concrete tiles, or shingles, each material comes with unique characteristics that can influence your decision.

In this blog post, we will explore the pros and cons of each of these roofing materials and the requirements for obtaining building certification if your roof has been damaged by more than 20%. Understanding the various materials available and the legal and safety requirements for roof replacements in Queensland can help ensure that your roofing project is completed efficiently, safely, and within compliance.

1. Decramastic Roofing Tiles: Pros and Cons

Decramastic roofing tiles are a distinctive roofing material that was popular in Australia during the 1960s and 1970s. These tiles are made of a metal core, often steel, which is coated with a layer of bitumen and finished with mineral granules that give them a tile-like appearance. They are often found on homes built during the mid-20th century.

Pros of Decramastic Roofing Tiles

1. Aesthetic Appeal: Decramastic tiles were designed to resemble traditional clay or concrete tiles, offering an aesthetically pleasing look for mid-century homes. The variety of finishes and colors available allows homeowners to choose a style that complements their property’s exterior.
2. Lightweight: Decramastic tiles are much lighter than traditional concrete or terracotta tiles. This makes them easier to handle and install, which can reduce installation time and costs.
3. Durability: These tiles are relatively durable, especially when compared to other materials such as timber. They offer good resistance to harsh weather conditions, including wind and rain.
4. Fire-Resistant: Since Decramastic tiles are made of metal and bitumen, they are naturally fire-resistant, offering an added layer of protection for your home.

Cons of Decramastic Roofing Tiles

1. Prone to Corrosion: Over time, the metal core of Decramastic tiles can suffer from corrosion, especially in areas with high humidity or coastal regions. Salt from the air can accelerate this process, which weakens the tiles and reduces their lifespan.
2. Limited Lifespan: Although initially durable, Decramastic tiles have a relatively short lifespan when compared to other roofing materials like concrete or metal. The bitumen layer can break down over time, leading to leaks and the need for replacement.
3. Difficult to Repair: If a Decramastic tile is damaged, it can be challenging to find replacement tiles that match the existing ones, as the material is no longer in production. This can make repairs more difficult and costly.
4. Environmental Impact: The material is not as environmentally friendly as some alternatives, especially since it has a relatively short lifespan and may contribute to landfill waste when it reaches the end of its useful life.

2. Asbestos Roofing: Pros and Cons

Asbestos was once a widely used material for roofing and other building applications due to its durability and heat-resistant properties. However, it has since been banned in Australia due to health concerns related to exposure to asbestos fibers. Despite the ban, many older homes still have asbestos roofs.

Pros of Asbestos Roofing

1. Durability: Asbestos roofing is known for its longevity and durability. It can withstand extreme weather conditions and does not rust or rot like other materials. It also resists fire and can handle high levels of heat, making it an excellent choice for homes in bushfire-prone areas.
2. Low Maintenance: Asbestos roofs require minimal maintenance compared to other materials. They do not need to be repainted regularly, and their sturdy nature makes them resistant to damage from heavy rain or wind.
3. Insulation Properties: Asbestos is a naturally good insulator, meaning it can help regulate the temperature inside the home, keeping it cooler in summer and warmer in winter.

Cons of Asbestos Roofing

1. Health Risks: The biggest drawback of asbestos roofing is the serious health risks associated with exposure to asbestos fibers. When the roof deteriorates or is disturbed during renovations, it can release harmful fibers into the air, leading to respiratory diseases, including asbestosis, lung cancer, and mesothelioma.
2. Legal and Regulatory Concerns: The removal and disposal of asbestos roofing must be handled by a licensed professional. There are strict regulations governing the removal, transport, and disposal of asbestos-containing materials in Queensland, which can add significant costs to the replacement process.
3. Difficult to Replace: If your asbestos roof is damaged, it can be difficult to replace due to the specialized handling required. Additionally, finding a matching replacement material that meets modern standards can be challenging.
4. Lower Property Value: Homes with asbestos roofing can have reduced property value due to the associated health risks and the costs of removal. Many potential buyers are hesitant to purchase a home with asbestos materials, which could make it harder to sell in the future.

3. Metal Corrugated Roofing: Pros and Cons

Metal corrugated roofing, typically made from materials such as steel, aluminum, or zincalume, is one of the most popular roofing choices in Australia. The wavy or corrugated design of the sheets gives them added strength and flexibility.

Pros of Metal Corrugated Roofing

1. Durability and Longevity: Metal corrugated roofing is extremely durable and resistant to the elements. It can withstand extreme weather conditions, including heavy rain, high winds, and hailstorms. Metal roofing is also fire-resistant and does not suffer from issues like corrosion or rot when properly maintained.
2. Lightweight: Compared to materials like concrete tiles, metal roofing is lightweight, which makes it easier and faster to install. This can lead to lower labor costs and quicker project timelines.
3. Energy Efficiency: Metal roofing can reflect solar heat, which helps to keep the interior of your home cooler in summer. This energy efficiency can lead to savings on cooling costs, making metal roofing an eco-friendly option.
4. Low Maintenance: Metal roofs require very little maintenance. They are resistant to moss and algae growth and do not need to be painted or treated regularly. If maintained properly, they can last for several decades.

Cons of Metal Corrugated Roofing

1. Noise: Metal roofing can be noisy, especially during heavy rain or hailstorms. This can be a concern for homeowners in areas that experience frequent storms or where peace and quiet are highly valued.
2. Initial Cost: While metal roofing can be cost-effective over time due to its durability and low maintenance, the initial installation cost can be higher than other roofing materials such as corrugated iron or asphalt shingles.
3. Denting: While metal roofing is durable, it can be prone to denting from hailstones or falling debris. The extent of damage depends on the gauge and type of metal used, with thinner metals being more susceptible to dents.
4. Aesthetic Limitations: While metal roofs come in a variety of finishes and colors, they may not offer the same traditional aesthetic appeal as materials like clay tiles or shingles, especially for more classical or heritage-style homes.

4. Concrete Roof Tiles: Pros and Cons

Concrete roof tiles are made from a mixture of sand, cement, and water, which are molded into tile shapes and cured in an oven. They are one of the most popular choices for roofing in Queensland due to their strength and variety of styles.

Pros of Concrete Roof Tiles

1. Durability and Strength: Concrete tiles are extremely durable and can last for decades. They are resistant to fire, rot, and pests, making them ideal for Queensland’s variable climate.
2. Thermal Insulation: Concrete tiles offer good thermal insulation, helping to regulate the temperature inside the home. In the hot Queensland climate, this can help reduce cooling costs.
3. Aesthetic Variety: Concrete roof tiles come in a wide range of styles, colors, and finishes, allowing homeowners to choose a style that complements their home. They can resemble traditional clay tiles, giving a classic look to modern homes.
4. Low Maintenance: Concrete tiles require minimal maintenance, particularly if they are properly installed and maintained. Unlike metal roofing, they do not require periodic painting or coating.

Cons of Concrete Roof Tiles

1. Weight: Concrete tiles are relatively heavy compared to other roofing materials, which may require additional structural support during installation. This can add to both material and labor costs.
2. Vulnerability to Cracking: Concrete tiles can be prone to cracking if subjected to heavy impacts, such as large hailstones. Once cracked, the tiles can be difficult to repair or replace, especially if they are no longer manufactured.
3. Initial Cost: The upfront cost of concrete tiles can be higher than other roofing materials like asphalt shingles or metal roofing. However, their long lifespan and low maintenance costs can offset this over time.
4. Moss and Algae Growth: Concrete tiles may experience moss or algae growth, especially in humid areas or shaded roofs. While this doesn’t compromise the structural integrity of the roof, it can detract from the roof’s appearance.

5. Shingles: Pros and Cons

Shingles, particularly asphalt shingles, are a common roofing material in many parts of the world. They are made from layers of asphalt and fiberglass, and their design often mimics traditional roofing materials like wood or slate.

Pros of Shingles

1. Affordability: Asphalt shingles are one of the most cost-effective roofing materials available. Their low initial cost makes them an attractive option for homeowners on a budget.
2. Variety of Styles: Shingles come in a wide variety of colors and styles, allowing homeowners to choose a look that fits their home’s design. They can mimic more expensive roofing materials like wood or slate.
3. Ease of Installation: Shingles are relatively easy to install compared to other materials like concrete or metal. This makes them an excellent choice for homeowners who want a quicker, more affordable roofing replacement.
4. Lightweight: Shingles are lightweight compared to other roofing materials, which makes them easier to handle during installation.

Cons of Shingles

1. Shorter Lifespan: Compared to materials like metal or concrete tiles, asphalt shingles have a shorter lifespan, typically lasting 20-30 years. This can mean more frequent replacements over time.
2. Vulnerability to Wind: Shingles can be easily damaged by strong winds, especially if they are not installed correctly or have become worn over time.
3. Prone to Moss Growth: In areas with high humidity, shingles can attract moss or algae growth, which can affect their appearance and performance.
4. Not as Durable: While shingles are cost-effective, they are not as durable as other materials. They can crack, warp, or curl due to extreme weather conditions, especially in areas with high winds or hailstorms.

6. Building Certification in Queensland

In Queensland, the Building Act 1975 and Queensland Development Code (QDC) set the standards for building and construction, including roofing replacements. If your roof has been damaged by more than 20%, you will need to obtain building approval from a licensed building certifier before proceeding with repairs or replacement.

Why Building Certification Is Required:

• Ensuring Compliance: Building certification ensures that the work carried out on your roof complies with local building codes and standards. This is particularly important for safety, structural integrity, and compliance with energy efficiency regulations.
• Protecting Property and People: Certification helps to ensure that the new roof is safe and durable, reducing the risk of future issues such as leaks or structural collapse.

What to Expect During the Certification Process:

1. Submission of Plans:

You will need to submit detailed plans for the roofing replacement, including material specifications and installation details. 2. Assessment of Compliance: The building certifier will assess whether the proposed roofing system complies with relevant regulations, such as wind resistance, insulation, and waterproofing standards. 3. Approval and Permitting: Once the plans are approved, the certifier will issue a building approval, allowing the roofing work to proceed. 4. Final Inspection: After the roof replacement is completed, the certifier will carry out a final inspection to ensure the work meets the required standards.

By following the necessary steps for building certification and working with a professional roofing contractor, you can ensure that your roof replacement is carried out safely and legally.