The chemical coating waterproofing treatment is a standard approach for seepage prevention in bathroom during new construction or renovation. This waterproofing treatment process includes: 1. Backfilling and PCC work for floor base formation 2. Surface drying and preparation for coating work 3. 1st layer of chemical coating 4. Construction of concrete chamber at corner areas of cement slurry in mix with waterproofing chemical 5. 2nd layer of chemical coating 6. Drying and surface finishing 7. Water Ponding Test