Volclay Waterstoppage is chemically treated, granular sodium bentonite used as a detailing accessory product for Volclay Waterproofing Systems.
A fillet of Waterstoppage can be poured at the footing/wall junction to provide additional waterproofing protection. A 3 mm thick layer of Waterstoppage is also applied to the top of tunnels and earth-covered roofs prior to the main Volclay waterproofing material course.
Mineralogical composition of Waterstoppage is a minimum 90% Montmorillonite with a maximum 10% native sediments and unaltered volcanic ash. Typical sieve analysis is 90% through a 20 mesh sieve and 10% through a 200 mesh sieve. Free swell rating of Waterstoppage is: two grams sifted into de-ionised water swells to occupy a minimum volume of 16cc.