1. Introduction
Metros & tunnels demand long-term watertightness under high hydrostatic pressure, often in confined or underground conditions. Systems must handle continuous water exposure, ground movement, and complex geometry.
2. Exposures
- Hydrostatic water pressure.
- Seepage through joints.
- Structural movement.
- Limited positive-side access.
3. Recommended Technologies
- PVC Loose-Laid Membranes → flexible, widely used in tunnel linings.
- HDPE Fully Bonded Membranes → confined areas, prevent water tracking.
- Crystalline Coatings → negative-side waterproofing backup.
4. Mapping Table
Exposure | Best Technology | Notes | Read More |
Hydrostatic pressure | PVC Membrane | Flexible, large sheets | PVC Membrane |
Confined tunnel sections | HDPE Bonded Membrane | Prevents water tracking | HDPE Membrane |
Negative side treatment | Crystalline Coating | For seepage backup | Crystalline Coatings |
Disclaimer
SpecX is an industry initiative & a neutral resource, compiled from industry references and best practices. It is not brand-specific. Always cross-check with project requirements and local codes before finalizing specifications.