The A89 autoroute, known as "La Transeuropéenne," is an East-west highway in central France that crosses the beautiful hill region of Perigord. To preserve the natural landscape of the French neighbourhood, the plan was to build several tunnels, one of which is named "la Crete." To fulfill the technical requirements of AFTES (the French association of tunnels and underground structures), a partitioned waterproofing solution was required. Moreover, the solution was meant to provide extreme resistance to aggressive agents and withstand the weight of the embankment.
Why BMI Group?
BMI Siplast’s solution, Teranap TP, satisfied the project’s demanding requirements and was selected to waterproof the 10.000 sqm of the tunnel.
Due to the curvature of the tunnel, the waterproofing was made with Teranap 431 TP, a high-performance elastomeric bituminous geomembrane. Teranap 431 combines SBS polymer and the highest quality asphalt with puncture-resistant polyester reinforcements (two layers of geotextile of 700 and 1500 g/sqm). The partitioning was made on a surface of about 320sqm using the Parafor Solo S membrane, a SBS elastomeric bitumen granule finished single layer membrane suitable for non-accessible roofs and technical roofs.