Rubber Roof vs. Built-Up Roof: Which Is Right for Flat Roofs?

Rubber Roof vs. Built-Up Roof: Which Is Right for Flat Roofs?

Rubber Roof vs. Built-Up Roof: Which Is Right for Flat Roofs?

When considering roofing options for flat roofs, two popular choices often come to the forefront: rubber roofs and built-up roofs. Each system offers distinct advantages and disadvantages, making it essential to understand their characteristics before making a decision. This article will delve into the details of rubber roofs and built-up roofs, comparing their costs, materials, longevity, and suitability for different applications.

What is a Rubber Roof?

A rubber roof, typically made from EPDM (Ethylene Propylene Diene Monomer), is a single-ply membrane known for its durability and weather resistance. This roofing material is especially popular in flat roof construction due to its flexibility, ease of installation, and excellent waterproofing properties.

Advantages of Rubber Roofs

1. Cost-Effective: Generally, the installation costs of a rubber roof are lower compared to other materials.
2. Longevity: With proper maintenance, a rubber roof can last 20 to 30 years, making it a wise investment.
3. Energy Efficiency: Many rubber roofing materials are designed to reflect sunlight, which can help reduce cooling costs in warmer climates.

Disadvantages of Rubber Roofs

1. Installation: While it can be a DIY project, proper installation is critical to avoid leaks.
2. Puncture Risk: Rubber can be susceptible to punctures, especially from sharp objects or heavy foot traffic.

What is a Built-Up Roof?

A built-up roof (BUR) consists of multiple layers of roofing felt and bitumen, providing a robust and reliable option for flat roofing. This system is often finished with a protective layer, such as gravel or a coating.

Advantages of Built-Up Roofs

1. Durability: Built-up roofs can withstand severe weather conditions and are less prone to punctures than rubber roofs.
2. Fire Resistance: BURs typically offer better fire resistance, making them suitable for certain building codes and requirements.
3. Maintenance: The layered structure allows for easy repairs and maintenance, as individual layers can be replaced if damaged.

Disadvantages of Built-Up Roofs

1. Cost: Generally, the installation of a built-up roof can be more expensive than a rubber roof due to the complexity of the materials and installation process.
2. Weight: BUR systems can be heavier than rubber roofs, which may require additional structural support.

Rubber Roof vs. Built-Up Roof: Cost Comparison

Rubber Roof vs. Flat Roof: Suitability

Both rubber roofs and built-up roofs are well-suited for flat roofing applications, but their performance can vary depending on specific conditions.

Weather Resistance

• Rubber Roof: Excellent against UV rays, rain, and snow. However, it can be prone to leaks if not installed correctly.
• Built-Up Roof: Superior protection against heavy weather, including high winds and hail, due to its layered design.

Foot Traffic

• Rubber Roof: Moderate durability; can be punctured or damaged under heavy foot traffic.
• Built-Up Roof: Better suited for rooftops with regular maintenance or foot traffic due to its robust construction.

Rubber Roofing Material for Flat Roofs

Types of Rubber Roofing

1. EPDM (Ethylene Propylene Diene Monomer): The most common type used for flat roofing, known for its durability and flexibility.
2. TPO (Thermoplastic Olefin): Offers energy efficiency and is increasingly popular, although not as robust as EPDM.
3. PVC (Polyvinyl Chloride): Known for its resistance to fire and chemicals, making it suitable for specific applications.

Installation Methods

• Fully Adhered: The membrane is glued to the substrate, providing a seamless barrier.
• Ballasted: Heavy materials (like gravel) hold the roofing in place, allowing for easier repairs.
• Mechanically Attached: The membrane is fastened to the roof deck, ensuring a secure fit.

Rubber vs. Built-Up Roof Durability

When assessing the durability of rubber roofs versus built-up roofs, several factors come into play:

Rubber Roof vs. Asphalt Roof

While comparing rubber roofs to asphalt roofs, it’s crucial to understand their key differences.

Cost Analysis

Performance Comparison

• Rubber Roof: Highly resistant to UV rays and extreme temperatures.
• Asphalt Roof: Better for sloped roofs but can be used in flat applications with proper installation.

Rubber Roof vs. Metal Roof

The choice between rubber roofs and metal roofs can also be pivotal, especially for flat roofing systems.

Key Differences

Benefits of Metal Roofs

1. Longevity: Metal roofs can last significantly longer than rubber roofs.
2. Reflectivity: Highly reflective surfaces can help in reducing energy costs.

Rubber vs. Rolled Roof

Rolled roofing is often compared to rubber roofs for low-slope applications. While rolled roofing is a quick and inexpensive solution, it may lack the durability and longevity of rubber roofing.

Comparison Chart

Is a Rubber Roof Good?

When considering whether a rubber roof is a good option for your flat roof, several factors should be assessed, including:

• Climate: Ideal for areas with moderate weather but less effective in extreme heat or cold without proper insulation.
• Usage: If you expect heavy foot traffic or require frequent access, a built-up roof might be more suitable.

Rubber Roofing vs. Fiberglass Roof on RVs

For recreational vehicles, both rubber roofing and fiberglass roofing present unique advantages:

Suitability for RVs

Rubber roofs are often preferred for RVs due to their flexibility and ability to conform to the vehicle’s shape, providing a reliable waterproof barrier.

Maintenance Considerations

Rubber Roof Maintenance

1. Regular Inspections: Check for signs of wear, especially at seams and around vents.
2. Cleaning: Use gentle cleaners to remove dirt and debris, avoiding harsh chemicals that can damage the membrane.

Built-Up Roof Maintenance

1. Surface Maintenance: Regularly inspect the gravel or coating to ensure it remains intact.
2. Repairs: Address leaks promptly by replacing damaged felt or bitumen layers.

Conclusion

Choosing between a rubber roof and a built-up roof depends on various factors including budget, installation preferences, climate conditions, and specific use cases. By understanding the unique characteristics and benefits of each system, homeowners and building managers can make an informed decision that suits their flat roofing needs.