15/07/2026
Sikaplan® WP 1100-20 HL is a high-performance synthetic waterproofing membrane made from PVC-P (plasticized polyvinyl chloride). It features a signal layer design and a non-reinforced structure, providing reliable protection for demanding waterproofing applications.
With a 2.00 mm thickness, the membrane is specially designed for foundation and tunnel projects exposed to high water pressure, mechanical stress, and challenging underground conditions.
Developed by Sika, a global leader in construction chemical solutions, Sikaplan® WP 1100-20 HL provides a durable waterproofing solution for infrastructure projects where long service life and high reliability are required.
✔ Excellent Aging Resistance Maintains its waterproofing performance over many years without significant loss of properties.
✔ Signal Layer for Easy Damage Detection The yellow upper layer reveals the dark grey layer underneath when damaged, allowing faster inspection and easier maintenance.
✔ DEHP (DOP)-Free Plasticizer System Provides a safer formulation with improved environmental and health considerations.
✔ High Mechanical Strength Offers excellent resistance against:
✔ Superior Resistance to Underground Conditions Designed to withstand:
✔ Cold Flexibility Maintains flexibility and does not crack at temperatures down to -20 °C.
✔ Hot Air Weldable Creates homogeneous and fully watertight joints through hot air welding.
✔ Suitable for Damp and Wet Surfaces Provides application advantages under difficult construction site conditions.
✔ Self-Extinguishing Properties Offers additional safety benefits regarding fire performance.
Sikaplan® WP 1100-20 HL is commonly used in:
It is particularly suitable for heavy-duty underground waterproofing applications requiring maximum protection.
Material: PVC-P, signal layer, non-reinforcedThickness: 2.00 mm (± tolerance)Unit Weight: 2.56 kg/m²
Roll Dimensions: 2.20 m × 20 m
Colors:
Tensile Strength:
Elongation at Break: ≥300%
Burst Resistance: ≥80% (D = 1.0 m)
Static Puncture Resistance: 2.35 kN
Impact Resistance: Watertight under a falling weight test from 750 mm
Long-Term Pressure Resistance: 7.0 N/mm² (50 hours)
Low Temperature Flexibility: -20 °C
Service Temperature Range: -10 °C to +35 °C
Reaction to Fire: Class E
Weld Seam Shear Strength: ≥6.0 N/mm
In underground waterproofing projects, a 2 mm thick membrane provides an important safety advantage. When projects involve high groundwater pressure, mechanical damage risks, or challenging soil conditions, thinner membranes may not provide sufficient protection.
Sikaplan® WP 1100-20 HL offers:
With these advantages, it is an effective solution for heavy-duty waterproofing applications in tunnels, foundations, and underground structures.
It is used for foundations, tunnels, underground storage facilities, dams, reservoirs, and structures exposed to high groundwater pressure.
The signal layer makes damage detection easier. When the yellow surface layer is damaged, the dark grey layer underneath becomes visible, helping identify problem areas quickly.
Yes. The membrane maintains flexibility and can withstand temperatures down to -20 °C.
No. The membrane joints are connected using hot air welding technology, providing safe and reliable waterproof connections.
