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Soprema Alsan Flashing
ALSAN® Flashing – Single-Component Polyurethane Waterproofing Coating
Seal Complex Details with Confidence. Durable. Flexible. Proven.
ALSAN® Flashing is a patented, single-component, polyurethane- and bitumen-based waterproofing coating designed to protect hard-to-access upstands, penetrations, and detailing areas where traditional sheet membranes are difficult to apply. Engineered by SOPREMA, this high-performance liquid-applied membrane offers seamless waterproofing, superior adhesion, and long-term durability.
Key Features:
- Single-Component Formula: No mixing required—ready to use straight from the container.
- Polyurethane & Bitumen-Based: Combines flexibility with robust waterproofing performance.
- Ideal for Complex Details: Perfect for upstands, corners, penetrations, and irregular surfaces.
- Reinforced with Polyfleece: Enhances strength and crack-bridging capability.
- Easy Application: Apply with brush or loose-laid method for fast, efficient installation.
- Durable & Weather-Resistant: Withstands harsh environmental conditions and UV exposure.
Recommended Applications:
- Flashing around roof penetrations and upstands
- Waterproofing transitions and detailing areas
- Repairs and reinforcement of vulnerable roof sections
- Integration with SOPREMA roofing systems
Technical Specs:
- Membrane Type: Liquid-applied flashing
- Material: Polyurethane with bitumen
- Reinforcement: Polyfleece
- Application Tools: Brush, loose-laid
- Packaging: Available in various container sizes
Why Choose ALSAN® Flashing?
Designed for precision waterproofing, ALSAN® Flashing offers a seamless, flexible, and highly durable solution
for roofing professionals. Whether you're detailing a new roof or repairing an existing one, this product ensures long-lasting protection
in the most challenging areas.


