Bentofix Waterstrip

This hydroexpansive joint ribbon is used to seal concrete working joints in both vertical and horizontal directions.

It consists of 75% sodium bentonite and 25% butyl rubber. The butyl rubber provides the flexibility to accommodate structural movements without affecting the seal. Upon contact with water, the Bentostrip expands more than 400% to provide a waterproof seal.

Bentostrip seals all voids or aggregation of gravel which occurs during the casting of reinforced concrete, even at considerable pressures. Its performance is unaffected by shrinkage / hydration cycles and it remains flexible at temperatures as low as –5ºC.

Bentostrip is fixed at 30 to 40cm intervals with steel nails, with the ends of the strips butt jointed. It can be glued to uneven surfaces and where nailing would not be possible, for example, when sealing objects penetrating the concrete, such as pipes. Concrete cover of at least 75mm is required.

Bentostrip is supplied as a rectangular section, approximately 25mm by 19mm, in rolls of 10m, four rolls per box.