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Which Bitumen Grade is Best for Waterproofing? 

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When it comes to waterproofing solutions, selecting the right bitumen grade is crucial for ensuring durability and effectiveness. Among various options, Bitumen 90/15 emerges as a standout choice, favored for its optimal balance of hardness and flexibility.

Also This grade is especially suited to a wide range of climates and exhibits excellent water-resistant properties, making it a go-to choice for waterproofing applications. And, Bitumen 90/15’s versatility extends beyond just waterproofing which is a popular choice in road construction and paving due to its medium grade. However, Its properties, such as viscosity and penetration levels, make it highly adaptable and efficient in providing long-lasting waterproofing solutions.

Properties of Oxidized bitumen 90/15 & 115/15?

Oxidized Bitumen 90/15 & 155/15 are the most popular solutions for waterproofing projects. This bitumen grade for waterproofing stands out due to the specific attributes that make it highly suitable for a range of applications in many different industries. Some of the properties of this soft bitumen grade can be listed as follows: 

Enhanced Viscosity 

Oxidized bitumen 115/15 is a bitumen grade for waterproofing which has a higher viscosity compared to other grades. This increased viscosity means it is less prone to flowing under stress, contributing to better stability and durability in waterproofing applications.

Improved Temperature Stability

One of the notable properties of oxidized bitumen 90/15 which is one of the waterproofing bitumen types is its enhanced temperature stability. It can withstand various temperature changes, making it ideal for environments experiencing fluctuating weather conditions.

Resistance to Water Penetration

The waterproofing prowess of oxidized bitumen 115/15 is remarkable. Because it is high-performance bitumen for waterproofing  Its composition provides excellent resistance to water penetration, ensuring that surfaces remain dry and protected over time.

Low-Temperature Flexibility

Despite its hardness, bitumen grade for waterproofing retains flexibility at lower temperatures. This characteristic prevents cracking and structural damage in cold climates.

Durability and Longevity

Oxidized bitumen 90/15 is known for its long-lasting properties. It resists wear and tear, which ensures that your waterproofing system remains effective for years.

Strong Adhesion

This grade of bitumen exhibits superior adhesion qualities, ensuring a strong bond with various substrates. This adhesion is crucial for effective waterproofing where the bitumen needs to adhere well to surfaces.

Reduced Temperature Susceptibility

Oxidized bitumen 90/15 shows less susceptibility to changes in temperature. This means its performance remains consistent in varying environmental conditions.


While providing robust waterproofing solutions, oxidized bitumen 90/15 which is the best bitumen grade for waterproofing is also a more eco-friendly option compared to some other synthetic waterproofing materials.

Waterproofing Industry Examples Bitumen 90/15 Used

Bitumen grade for waterproofing is 90/15 due to its unique properties. Some of the industry examples that we categorized are as follows:

Roofing Solutions

In the roofing industry, Bitumen 90/15 is highly valued for its exceptional waterproofing qualities. This grade of bitumen is particularly effective in sealing flat and low-slope roofs, where water accumulation is a concern. Its advantages include:

  • Durability: It is one of the best bitumen grade that forms a robust, weather-resistant layer that withstands extreme temperatures and UV radiation. This ensures a long lifespan for the roofing material.
  • Flexibility: It adapts well to the thermal expansion and contraction of roofs and reduces the risk of cracks and leaks.
  • Ease of Application: Its application in various forms, such as shingles or rolled sheets, makes it a versatile choice for different roofing styles.

Foundation Waterproofing

In the construction sector, the use of Oxidized Bitumen 90/15 for foundation waterproofing is pivotal. It provides a protective barrier that prevents moisture from seeping into basements and foundations. The advantages here include:

  • Strong Adhesion: Bitumen 90/15 adheres well to concrete and masonry, forming a seamless barrier against water ingress.
  • Cost-Effectiveness: It offers an economical solution for waterproofing large surface areas like foundations.
  • Protection Against Soil Acidity: It acts as a shield against the corrosive effects of soil acidity on building materials.

Road Construction

While primarily used for paving, Oxidized Bitumen 90/15’s role in road construction indirectly impacts waterproofing. And, It helps in creating a water-resistant surface and ensures better drainage and longer road life. The benefits include:

  • Rutting Resistance: It withstands heavy traffic loads without deforming, maintaining the integrity of the road surface.
  • Water Resistance: Prevents water from seeping into the road base, which can cause damage and erosion over time.

Bridge and Tunnel Coatings

For bridges and tunnels, Bitumen 90/15 & 115/15 offers a durable coating solution that protects against water damage. In addition, this is a climate resistant bitumen. Key advantages are:

  • Corrosion Resistance: It shields metal and concrete components from corrosion caused by water and environmental pollutants.
  • Seamless Application: Ensures a continuous, gap-free coating, which is crucial for the integrity of these structures.

Water Storage and Treatment Facilities

In water treatment and storage facilities, Bitumen 90/15 is used to line tanks and reservoirs. Its benefits include:

  • Chemical Resistance: Offers resistance to chemicals used in water treatment and ensures the safety and purity of the water.
  • Non-Toxic: Once cured, it does not leach harmful substances that makes it safe for water containment applications.

Landscaping and Water Features

Bitumen 90/15 finds its use in creating waterproof membranes for ponds, pools, and other water features in landscaping. Its advantages are:

  • Aesthetic Flexibility: You Can use beneath various decorative elements without compromising the design.
  • Longevity: Provides a long-lasting waterproofing solution that withstands outdoor conditions effectively.

In each of these industries, Bitumen 90/15 stands out for its unique combination of durability, flexibility, and water-resistant properties. These properties make it an excellent choice for a wide range of waterproofing needs. Whether you are a professional in the construction industry or handling a DIY project. Understanding these advantages can help you make informed decisions about the best waterproofing solutions.

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