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Key Features of Blown Asphalt in Philippine Building Practices

by Ahsan Khan

Blown asphalt, often referred to as oxidized asphalt, is a versatile material extensively used in various construction projects across the Philippines. Known for its durability and flexibility, it plays a crucial role in enhancing the longevity and performance of infrastructure and buildings. This article delves into the key features of blown asphalt and its application in Philippine building practices, highlighting its advantages and unique characteristics.

What is Blown Asphalt?

Blown asphalt is created by blowing air through hot asphalt. This process increases the asphalt’s oxidation level, enhancing its hardness, heat resistance, and durability. The end product is a material with a higher melting point and superior weathering properties compared to traditional asphalt.

Enhanced Durability and Weather Resistance

One of the most significant advantages of blown asphalt is its durability. It withstands extreme weather conditions, including the tropical climate of the Philippines, which is characterized by heavy rainfall, high humidity, and intense heat. Blown asphalt’s ability to resist softening under high temperatures and hardening in colder conditions makes it an ideal material for a range of construction applications, including:

  • Roofing: Blown asphalt is widely used in roofing due to its excellent water-resistant properties. It prevents leaks and water damage, ensuring the structural integrity of buildings.
  • Road Construction: Its robustness makes it suitable for road construction, where it provides a durable and stable surface that can handle heavy traffic loads and resist wear and tear.

Versatility in Applications

Blown asphalt is incredibly versatile and can be used in various forms:

  • Membrane Roofing Systems: It is commonly used in the manufacture of roofing membranes that provide a protective layer against water infiltration.
  • Damp Proofing: Blown asphalt is effective in damp proofing applications, protecting buildings from moisture and preventing structural damage.
  • Pipe Coating: It is also used as a protective coating for pipes, offering resistance to corrosion and ensuring the longevity of pipelines.

Cost-Effectiveness and Sustainability

In addition to its technical benefits, blown asphalt is cost-effective. Its long lifespan reduces the need for frequent repairs and replacements, leading to significant savings over time. Moreover, blown asphalt can be recycled and reused, contributing to sustainable building practices. This aligns with the growing emphasis on sustainability in the construction industry in the Philippines, where eco-friendly materials are increasingly sought after.

Superior Adhesion and Flexibility

Blown asphalt’s excellent adhesion properties make it a preferred choice for various applications. It bonds well with different substrates, ensuring a strong and reliable connection. This feature is particularly beneficial in the construction of waterproofing systems and protective coatings, where a firm bond is essential to prevent leaks and damage.

Additionally, blown asphalt remains flexible even after prolonged exposure to weather conditions. This flexibility allows it to accommodate structural movements and temperature fluctuations without cracking or losing its integrity. This characteristic is crucial in the Philippines, where buildings are subjected to significant environmental stresses.

Resistance to Chemical and Environmental Factors

Blown asphalt exhibits exceptional resistance to chemicals and environmental factors. It is not easily degraded by oils, solvents, or other chemicals, making it suitable for use in industrial settings. Furthermore, its resistance to UV radiation prevents degradation from prolonged exposure to sunlight, ensuring long-term performance and stability.

Ease of Application

The application process of blown asphalt is relatively straightforward, which adds to its appeal in construction projects. It can be applied using conventional methods, such as brushing, spraying, or troweling, making it accessible to various building practices in the Philippines. This ease of application allows for efficient installation and reduces the time required for construction and maintenance.

Compatibility with Modern Construction Techniques

Blown asphalt integrates well with modern construction techniques, enhancing the performance of contemporary building systems. It can be used in conjunction with other advanced materials and technologies to create high-performance structures. This compatibility makes it a valuable component in the construction of energy-efficient buildings, green roofs, and other innovative projects in the Philippines.

Key Benefits of Blown Asphalt in Philippine Building Practices

The use of blown asphalt in Philippine building practices offers several key benefits:

  • Improved Building Longevity: By providing superior protection against weathering and environmental factors, blown asphalt extends the lifespan of buildings and infrastructure.
  • Enhanced Energy Efficiency: Blown asphalt’s reflective properties can help reduce heat absorption, contributing to the energy efficiency of buildings and lowering cooling costs.
  • Reduced Maintenance Costs: Its durability and resistance to damage minimize the need for frequent maintenance, leading to lower overall costs for building owners and operators.


Blown asphalt is a valuable material in Philippine building practices, offering a range of features that enhance the durability, flexibility, and sustainability of construction projects. Its ability to withstand the country’s challenging climate, combined with its cost-effectiveness and ease of application, makes it an essential component in modern construction. As the demand for resilient and sustainable building materials grows, blown asphalt continues to play a crucial role in shaping the future of infrastructure and architecture in the Philippines.

For more information on the benefits and applications of this versatile material, consider exploring the resources and products available for blown asphalt Philippines. Its diverse features and advantages make it a smart choice for a wide range of construction needs, ensuring that buildings and infrastructure are built to last.

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