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- Thormajoint®
World's number 1 asphaltic bridge joint system
Thormajoint® has been at the forefront of the industry for over 50 years with over 1 million metres installed in 50+ countries.
No other system compares. With half a century of success, Thormajoint® isn’t just the choice. It’s the standard.
Seamless, durable and unrivalled, Thormajoint® is trusted by contractors and installers everywhere.
Layers of excellence
Built with layers of binder and stone, our asphaltic bridge joint system effectively accommodates bridge movement whilst sealing the expansion gap. The result is a completely watertight, classified system that ensures long-term structural protection.
About our leading Thormajoint® system
The proven bridge expansion joint for effectiveness, economy and reliability.
Established first, delivering excellence always
Thormajoint® is a pioneering multi-stage bridge joint system that accommodates total horizontal bridge movements up to 50mm (+/- 25mm). Developed by Prismo® in 1970, it was the first asphaltic plug joint ever created and has remained a trusted choice in the industry for over 50 years. Thormajoint® blends seamlessly with the road surface, accommodates movement across the entire bridge deck, and acts as a waterproofing system to protect bridge bearings.
It consists of a mixture of single sized aggregate and polymer-modified binder which provides stability and flexibility to accommodate the movement of the joint. We have developed various grades of binder to help meet all climatic conditions from arctic to tropical, that accommodate longitudinal, vertical and transverse movements.
Product benefits
- Cost-effective: Lower cost compared to other joint systems.
- Quick installation: Requires no mechanical fixing, with minimal disruption.
- Safety: Ensures a smooth, quiet and safe transition for vehicles and motorists.
- Versatile: Can be surface dressed for skid resistance and drainage systems can be incorporated.
- Sustainable: Formulated with recycled tyres in components.
Our asphaltic bridge joint system offers a practical alternative to mechanical joint systems, providing a durable and reliable solution with minimal maintenance, straightforward installation, and a long service life. Trusted around the world, Thormajoint® continues to support long-lasting, high-performance infrastructure.
Our pioneering bridge joint solution is approved by
UK Department of Transport and road authorities worldwide.
Become an approved Thormajoint® installer
Gain official certification through our Thormajoint® training programme and join our network of approved installers so you can deliver bridge joint installations with confidence and precision.
Proven uses for Thormajoint®
Old bridges preservation
Extends the service life of ageing bridge structures by sealing gaps, preventing water ingress, and protecting the underlying structure.
New constructions
Ideal for integration into new bridge builds, to ensure long-term watertight protection and accommodate movement from day 1.
Failed joint systems
A proven replacement solution for mechanical or asphaltic joints that have deteriorated, restoring performance and durability.
Caulk system replacement
An upgrade from outdated caulk and sealant-based joints, delivering far superior resilience, sealing, and service life.
Case study
Gothenburg, Sweden
Marieholm Tunnel is submerged beneath the Göta River. It carries up to 90,000 vehicles daily and reaches depths of 17 metres below the water surface.
Our Thormajoint® BJ200 Super Ex binder was selected for its exceptional cold-weather performance and high movement capacity. The installation delivered a smooth, seamless finish and a completely waterproof structure.
Case study
Pitlochry, Scotland
The A9, a major route for trade and tourism, is the longest road in Scotland which provides a link between Central Scotland and the Highlands.
To support this highly trafficked road, Thormajoint® BJ200 ST binder was selected for two bridge joint installations, providing greater stability to road users and resistance to deformation.
Case study
Otwock, Poland
The Autostrada Wolności is Poland’s largest motorway, connecting the Polish-German border to Warsaw and serving as a key transport route to Western Europe.
Thormajoint® BJ200 ST binder was installed in three joints on the eastbound carriageway, chosen for its flexibility in harsh climates and resistance to traffic-induced deformation.
Thormajoint® binder grades
Proven to work in all climates, from arctic to tropical.
Product downloads
Application methods
Case study (A9 Road, Pitlochry, Scotland)
Case study (Road 304, Saudi Arabia)
Case study (Autostrada, Otwock, Poland)
Case study (A64 Motorway, Leeds, England)
Case study (Marieholm Tunnel, Sweden)
Prismo® brochure
Technical data sheet
Safety data sheet
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