Sika 1 waterproofing additive 5Ltr

Legendary waterproofer from Sika The original waterproofing additive for cement based mixes of concrete, render and screed. A real trade classic waterproofer. Unchanged over 100 years! Dilute with water and dose to the mix. Works by allowing a small amount of water to penetrate and cause swelling of the silicate molecules which, as they grow, block the pores and so resist water under pressure. Time tested and well known in the trade! Trade / DIY applications Concrete waterproofer Screed waterproofer Render waterproofer How to step-by-step Dilute with water. Dose to the mix.