IS 13182:1991 is the Indian Standard (BIS) for waterproofing and damp-proofing of wet areas in building - recommendations. This standard provides recommendations for waterproofing and damp-proofing treatments for wet areas within buildings, such as toilets, kitchens, and balconies. It covers the selection of appropriate materials, design considerations to ensure effective water management, and guidelines on workmanship for application. The code aims to prevent water leakage, seepage, and dampness which can damage the building structure and finishes.
Waterproofing and Damp-Proofing of Wet Areas in Building - Recommendations
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Floor Gradient (Shower Area) | 1 in 40 to 1 in 60 | Between 1:60 and 1:80 | AS/NZS 3740:2021 |
| Floor Gradient (General Wet Area) | About 1 in 100 towards the drain | A minimum of 1:100 | AS/NZS 3740:2021 |
| Waterproofing Height in Showers | Recommended 150-300 mm upstand; not specified for full wall height. | Minimum 1800 mm from the finished floor level, or 25 mm above the fixed shower head. | AS/NZS 3740:2021 |
| Waterproofing Height over Bathtub | Not explicitly specified, general upstand rules apply. | Minimum 150 mm above the bath rim where it abuts a wall. | AS/NZS 3740:2021 |
| Junction Treatment | Recommends a cement-sand mortar fillet of 25 mm radius. | Requires a bond breaker system (e.g., flexible sealant bead or tape) at all internal corners and junctions. | AS/NZS 3740:2021 |
| Flood Testing | May be tested by ponding water for 48 hours. | Required for a minimum of 24 hours (TCNA) or 4 hours (AS 3740) with a minimum depth of water before tiling. | TCNA Handbook / AS/NZS 3740:2021 |
| Water Stop at Doorway | Recommends 'kadas' or threshold of 25 to 75 mm height. | Requires a water stop angle at the doorway with a minimum vertical leg of 5 mm above the finished tile level. | AS/NZS 3740:2021 |