Do not save on building materials. Choose only high -quality materials of proven brands. In preparing cement, not only concrete is used, but also water. There are no special requirements for water, but it should not contain impurities (oil, chlorine). With waterproofing, not everything is as simple as with water. High -quality laying of this layer extends the life of the foundation. To select “correct” materials for waterproofing, it is better to contact a professional-navigator-concrete company.