A new luxury apartment tower and townhome complex, which will have 258 units, is being constructed in Vancouver’s Mount Pleasant neighborhood. The 21-storey mixed-use development has been years in the making and boasts a 22,000 sq.ft shared ‘backyard’ designed to foster a sense of community. To provide enough underground (below grade) space for parking and storage of bikes etc., the design included a very deep basement for the whole building footprint which is a full city block. To speed up construction and cut costs, the construction team decided to use structural shotcrete for the below grade walls.
To waterproof the below grade walls, the project team added Krystol Internal Membrane (KIM) in the structural shotcrete. The team considered using an externally applied traditional waterproofing membrane, but chose KIM because of its superior performance and pricing. KIM is a hydrophilic crystalline admixture used to create permanently waterproof concrete and it contains Kryton’s proprietary Krystol Technology. Once added to the concrete, Krystol chemically reacts with water and un-hydrated cement particles to form insoluble needle-shaped crystals. These crystals fill capillary pores and micro-cracks in the concrete to block pathways for water and waterborne contaminants. Krystol will continue to give the concrete structure a self-sealing ability. If water is re-introduced through a rise in hydrostatic pressure or through hairline cracks, Krystol will initiate further crystallization to ensure permanent waterproof protection. Krystol works for the life of the concrete. By stopping the transmission of water through concrete, KIM adds durability and longevity to concrete by protecting it against chemical attack and corrosion of reinforcing steel.