Sika 1 Waterproofer Is A Chloride-Free, Ready To Use And Easily Dispersed, Normal Setting Liquid Waterproofer Admixture For Mortar And Concrete. Sika 1 Blocks The Capillaries And Pores In The Applied Cementitious System To Provide An Effective Water Barrier Against The Transmission Of Liquid Water, Increasing The Impermeability Of Mortar/Concrete. Sika 1 Is Used To Waterproof Mortars And Concrete In Renders, Masonry, Screeds And Substrates. Sika 1 Can Be Used In Reinforced, Or Unreinforced Concrete And Can Be Used For Both Indoor And Outdoor Applications Such As Brickwork, Basements, Swimming Pools, Tunnels, Water Tanks, Manholes And Culverts.