Easy application
Moulds to the roof with glass fibre matting reinforcement
Liquid applied polyurethane membranes provide a seamless, cold-applied waterproofing solution for flat roofs, commercial and industrial buildings, balconies and other exposed roof areas. They form a durable, weather-resistant membrane that can easily accommodate complex detailing, penetrations and irregular roof shapes. Sika's polyurethane waterproofing technology combines the benefits of seamless application, long-term weather resistance and installation flexibility, making it suitable for both new build and refurbishment projects. The Sikalastic®-625 N polyurethane waterproofing membrane incorporates Sika's patented i-Cure® technology, offering improved temperature stability, enhanced workability and a longer shelf life.
Sikalastic®-625 N
Sikalastic®-625 N is a versatile liquid applied polyurethane waterproofing membrane for exposed roofing applications. This membrane cures to form a seamless, durable and weather-resistant waterproofing layer suitable for flat roofs, pitched roofs, metal roofs, commercial and industrial buildings, balconies and walkways.
Incorporating Sika's patented i-Cure® technology, Sikalastic®-625 N has been developed to provide improved temperature stability, enhanced workability and a longer shelf life. As a liquid applied system, it can be easily installed around complex roof details, penetrations and irregular roof shapes, creating a continuous waterproofing membrane without joints or laps.
Key features of Sikalastic®-625 N:
- One-part polyurethane membrane
- Cold-applied with no heat or flames required
- Seamless waterproofing layer
- Durable and weather-resistant performance
- Suitable for exposed roof areas
- Improved temperature stability
- Good water vapour permeability
- Enhanced workability during application
- Longer shelf life
- Compatible with glass fibre reinforcement mat
- Suitable for complex detailing and penetrations
- BBA certified (when used as part of the complete Sikalastic®-625 N Fully-Reinforced System)
- Has European Technical Assessment ETA-20/1023 of 2020/12/20
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FAQ
What is a liquid polyurethane membrane system?
A liquid polyurethane membrane system is a cold-applied waterproofing solution that cures to form a seamless, flexible, and durable membrane. It is commonly used on flat roofs, balconies, and terraces to provide long lasting protection against water ingress, UV exposure and weathering. These systems are ideal for detailing around penetrations and complex roof shapes.
Posted on: 06/08/2025
What are the typical uses of liquid polyurethane systems?
Liquid polyurethane systems are widely used for waterproofing flat roofs, commercial and industrial roofs, balconies, terraces, walkways and refurbishment projects. Their seamless application makes them especially suitable for complex roof details, upstands and penetrations.
Posted on: 06/08/2025
What liquid polyurethane membrane system does Sika offer?
Sika offers Sikalastic®‑625 N, a high-performance, cold-applied liquid polyurethane membrane designed for flat roof waterproofing. It cures to form a seamless, durable and UV-resistant finish, making it ideal for both new construction and refurbishment projects. The system is reinforced with glass fibre matting and provides excellent flexibility, even around complex roof details.
Posted on: 06/08/2025
What are the benefits of Sika’s liquid polyurethane membrane system?
The Sikalastic®‑625 N liquid polyurethane membrane system offers a range of advantages:
- Easy application with cold-applied, seamless installation
- Moulds to complex roof shapes using glass fibre matting reinforcement
- Versatile solution suitable for a wide range of waterproofing applications
- Exclusive i‑Cure® technology for improved curing, workability and long-term performance
- Cold-applied system that reduces on site health and safety risks
- Full service package including consultation, roof survey and bespoke design support
- Comprehensive warranties to minimise project risk and ensure peace of mind
Posted on: 06/08/2025
How are Sika’s liquid polyurethane membranes applied?
Sikalastic®‑625 N liquid polyurethane membrane is cold-applied by brush, roller or airless spray.
Posted on: 06/08/2025
