During the construction of underground structures, in the presence of water tables, waterproofing is achieved by means of synthetic membranes divided into compartments and welded together by FLEXVINIL® COM flat compartmental joints.

This system allows to control water losses and also to perform local injections, in case of damage of the waterproof membranes. The FLEXVINIL® COM compartmental joint is applied to ensure the hydraulic sealing between the different sectors of the membranes, while granting resistance to acid solutions, alkaline environments and salt water.

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