Patented in 2005, FLEXIARCH has involved 10 years of research at Queens University, Belfast and 5 years of research and development at Macrete Ireland. The concept is based on the use of modern precast concrete, an innovative method of construction, simplified transportation and rapid deployment.

The precision-made pre-cast voussoirs are laid contiguously horizontally with a layer of polymeric reinforcement on top. They are connected by an in-situ concrete screed, about 40mm thick, placed on top. Subsequently the "flat–pack" system, as it is initially straight, can be stacked on a lorry and transported to site.

When lifted, its self weight causes it to fall into the desired shape as concrete hinges form in the screed and the tension in the polymeric reinforcement maintains the integrity of the arch. The FlexiArch units are then placed on accurately located precast footings. Precast spandrel walls are attached to retain the backfilling.

The three cycle/foot bridges were in a sensitive linear parkway in Newtonabbey on a site that was traversed by multi-span arch bridges. FlexiArch selected by consultants, WDR & RT Taggart proved to be ideal and users of the cycle path/walkway have been delighted with the aesthetic outcome.