Description
Ultra-Flex Gap Filler & Adhesive – High-Performance PU Mastic
Seamless Bonding & Gap Sealing for ULTRAFLEX® Waterproofing Systems
Ultra-Flex Gap Filler & Adhesive is a high-performance polyurethane (PU) mastic specifically formulated for use with the ULTRAFLEX® liquid waterproofing system. Featuring high initial tack, fast curing, and exceptional bonding strength, it delivers reliable adhesion and gap filling to ensure durable, watertight detailing across critical roof areas.
Key Benefits
- ✅ Superior Bonding Strength – Forms a strong, long-lasting adhesive seal on common roofing substrates.
- ✅ Fast Curing – Enables efficient installation and detailing with reduced downtime.
- ✅ High Initial Tack – Provides immediate grip during application.
- ✅ No Primer Required – Saves time and labour costs in most applications.
- ✅ Seamless Integration – Designed for direct compatibility with ULTRAFLEX® waterproofing systems.
- ✅ Long-Lasting Performance – Supports BBA-certified systems with a service life exceeding 25 years.
Ideal for Waterproofing & Structural Sealing
- Flat & pitched roofs
- Terraces & balconies
- Canals, gutters & drainage details
- New build and refurbishment projects
Coverage
- Approx. 8–10 linear metres per cartridge (depending on joint width and depth)
For bulk orders, roof kits, and export pricing, contact our team on 01268 472358.
Ultra-Flex Gap Filler & Adhesive provides reliable adhesion and watertight sealing, making it an essential detailing component within any ULTRAFLEX® waterproofing system.
Frequently Asked Questions
Do I need a primer before applying Ultra-Flex Gap Filler?
No. In most applications, no primer is required when used as part of the ULTRAFLEX® waterproofing system.
Can this be used as a general sealant?
It is specifically designed for roofing and waterproofing details and should be used with compatible PU-based systems.
How quickly does it cure?
The product skins quickly and cures rapidly, allowing waterproofing work to progress without delays.
Is it suitable for external use?
Yes. It is formulated for long-term external exposure within ULTRAFLEX® waterproofing applications.
Application Video
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