Containment Liners and Waterproofing Textiles
topic
Building and civil containment liners use flexible geomembranes and waterproofing systems to prevent water ingress in basements, tunnels, water features, and underground structures. Tunnel waterproofing uses EVA (ethylene vinyl acetate) or HDPE waterproofing membranes (1.5–3.0 mm, tensile strength 15–25 MPa, elongation >500%, EN 13491) protected by needle-punched nonwoven PP fleece (500–800 g/m²) against shotcrete puncture. Basement tanking systems (polymer-modified cementitious coatings 1–3 mm + polyester reinforcement scrim 50–100 g/m²) provide Type B waterproofing (BS 8102) resisting 5–10 m water head. Bentonite waterproofing panels (sodium bentonite granules 4–5 kg/m² between nonwoven geotextile layers, Sd > 10,000 m) provide self-healing waterproofing for basement slabs and retaining walls — bentonite hydration seals penetrations ≤3 mm diameter without intervention. Swimming pool and water feature liners (PVC reinforced with polyester woven scrim, 1.0–2.0 mm, breaking strength 400–800 N/50mm, EN 14803) resist hydrostatic pressure of 1–5 m water head. Podium deck waterproofing (PVC or TPO membrane 1.5–2.0 mm + protection fleece 300–500 g/m² + drainage layer) protects structural slab beneath landscaped terraces and car parks, draining water at >5×10⁻⁴ m²/s transmissivity. Global building waterproofing market exceeds $2.4 billion.
Role
Building containment liners and waterproofing systems protect structural concrete elements from hydrostatic pressure and moisture-driven deterioration, preventing the water ingress responsible for reinforcement corrosion, frost damage, and foundation instability that cause premature structural failure in below-ground and water-retaining construction.