This is a standard waterproofing treatment for terrace during new construction and renovation. The treatment process includes: 1. Backfilling and PCC Work 2. Surface cleaning and preparation for coating 3. 1st layer chemical coating 4. Concrete chamber construction in the corner areas with cement mortar in mix with waterproofing chemical 5. Application of waterproofing membrane sheet 6. 2nd layer chemical coating 7. Drying and surface finishing 8. Water ponding test