Waterproofing Systems for Tunnels, Underground Works and Technical Structures
Instaduction
PVC geomembranes (Polyvinyl Chloride Geomembranes) are one of the most reliable and widespread waterproofing solutions for underground engineering projects, tunnels, dams, reservoirs, landfills, transportation engineering projects and hydraulic structures.
They are made of flexible polyvinyl chloride (PVC-P), presenting high elasticity, excellent tightness and long service life even in demanding environments.
PVC geomembranes are used internationally in large infrastructure projects due to their ability to accommodate substrate movements without loss of waterproofing.
Key Advantages
- Absolute water tightness
- High elasticity and elongation
- Resistance to static and dynamic loads
- Resistance to microorganisms and plant roots
- Puncture and impact resistance
- Low-temperature resistance
- Long lifespan
- Capability for heat-sealing the joints
- Suitable for underground and geotechnical projects
PVC Geomembrane Categories
1. PVC Geomembrane Tunnel Grade
Special geomembranes for waterproofing tunnels and underground projects.
They are used in:
- Road tunnels
- Railway tunnels
- Metro
- Underground stations
- Underground technical works
They are characterized by:
- High elasticity
- High elongation at break (>200%)
- Resistance to permanent moisture
- Hot air welding capability
2. Signal Layer PVC Geomembrane
Two-color geomembrane (Signal Layer) for easy identification of possible damage during application or during operation of the project.
Advantages:
- Immediate visual fault identification
- Enhanced construction safety
- Easier quality control
- Ideal for tunnels and underground structures
3. Reinforced PVC Membranes
With integrated polyester or glass-mesh reinforcement.
Applications:
- Ceilings
- Rooftops
- Industrial buildings
- Large surfaces
They provide increased mechanical strength and ease of installation.
Standard Dimensions
Thicknesses
PVC geomembranes are typically available in:
- 1,20 mm
- 1,50 mm
- 2,00 mm
- 2,50 mm
- 3,00 mm
The thicknesses of 1.5 mm, 2.0 mm, and 3.0 mm are specified in the technical data for the GeoTech Signal Layer series.
Roll Width
- 2,00 m
- 2,10 m
- 2,20 m
- 2,50 m
Roll Length
- 20 m
- 25 m
- 30 m
- 40 m
The technical data sheet for the reinforced GeoTech SE PVC geomembrane specifies a length of 20 m per roll.
Technical Specifications
The membranes are completely watertight in accordance with the EN 1928 standard.
Typical values: ≥ 15 N/mm² for Signal Layer geomembranes.
≥ 200% for geotechnical applications.
Down to -25°C without cracking.
Suitable for temporary exposure during construction and special outdoor applications.
Applications
Tunnels
- Road tunnels
- Railway tunnels
- Metro
- Underpasses
They are installed between the primary and final concrete, creating continuous watertight protection.
Underground Constructions
- Building basements
- Underground parking areas
- Technical shafts
- Pumping stations
Hydraulic Works
- Water tanks
- Dams
- Channels
- Lakes
- Artificial reservoirs
Environmental Projects
- Landfill
- ΧΥΤΥ
- Industrial containment basins
- Waste treatment facilities
Installation Methods
Free Laying
For tunnels and geotechnical projects.
Mechanical Fastening
For flat roofs and roofs.
Heat sealing
The coverings are bonded using specialized heat-sealing machines, creating a completely watertight system.
Certifications
GeoTech geomembranes are manufactured in accordance with European standards and hold CE certification for use in waterproofing projects for infrastructure, tunnels, reservoirs, and dams, as well as in geotechnical applications.