What Is Sanded Bituminous Membrane?

Sanded bituminous membrane is a waterproofing material manufactured by coating the upper surface of a bitumen-based waterproofing membrane with fine mineral sand. It is widely used in foundation, retaining wall, terrace, and roof waterproofing applications. In multi-layer waterproofing systems, it is commonly installed as a base or intermediate layer.

Thanks to its durability and cost-effectiveness, sanded membrane is one of the most commonly used waterproofing products in the construction industry, helping protect buildings against moisture and water penetration.

What Is Sanded Bituminous Membrane Used For?

The primary purpose of waterproofing is to protect building components from water-related damage. Sanded membranes provide several important benefits:

• Prevent water leakage
• Protect reinforced concrete structures
• Reduce reinforcement corrosion
• Minimize dampness and mold formation
• Extend the service life of buildings
• Lower maintenance costs

They are particularly effective in foundation and terrace waterproofing systems.

Where Is Sanded Bituminous Membrane Used?

Sanded membranes are suitable for a wide range of applications, including:

• Foundation waterproofing
• Retaining wall waterproofing
• Raft foundation systems
• Terrace roofs
• Parking deck waterproofing
• Wet areas
• Basement structures
• Industrial buildings

They are also widely used as the bottom layer in double-layer waterproofing systems.

Types of Sanded Bituminous Membranes

SBS Modified Sanded Membrane

SBS-modified membranes maintain flexibility even at low temperatures.

Advantages:

• High elasticity
• Excellent low-temperature performance
• Crack-bridging capability
• Long service life

APP Modified Sanded Membrane

APP-modified membranes are designed for superior performance in high-temperature environments.

Advantages:

• Excellent UV resistance
• High-temperature durability
• Dimensional stability
• Long-lasting performance

What Is the Difference Between Sanded and Mineral-Finished Membranes?

Sanded and mineral-finished (slate-coated) membranes are often confused, but they serve different purposes.

Sanded Membrane

• Typically used as a base or intermediate waterproofing layer
• Coated with fine mineral sand
• Offers a cost-effective waterproofing solution

Mineral-Finished (Slate-Coated) Membrane

• Used as the final exposed waterproofing layer
• Covered with colored mineral granules
• Provides enhanced UV protection and weather resistance

For exposed roof applications, mineral-finished membranes are generally the preferred choice.

How Is Sanded Bituminous Membrane Installed?

Proper installation is essential for long-term waterproofing performance.

Typical installation steps include:

• Clean and prepare the substrate.
• Apply a bitumen primer.
• Position the membrane on the surface.
• Bond the membrane using a propane torch.
• Carefully seal all overlaps.
• Complete detailing around corners and penetrations.
• Apply a protective layer if required.

Professional installation ensures reliable waterproofing and long-term durability.

Advantages of Sanded Bituminous Membrane

• Cost-effective waterproofing solution
• Excellent water resistance
• Easy installation
• High mechanical strength
• Suitable for various climate conditions
• Long service life

These advantages make it a preferred solution for residential, commercial, and industrial construction projects.

Sanded Bituminous Membrane Prices

The price of sanded bituminous membranes depends on several factors, including membrane thickness, reinforcement type, bitumen quality, and manufacturer. Membranes with 3 mm and 4 mm thicknesses are among the most commonly used products on the market.

Conclusion

Sanded bituminous membrane is a reliable and economical waterproofing material used in a wide variety of construction applications, from foundations to roofs. By protecting structures against water infiltration, it helps extend building lifespan, reduce maintenance requirements, and improve long-term structural durability. Proper material selection and professional installation are essential to achieving maximum waterproofing performance.