EPDMMembrane
High-performance synthetic elastomer (Ethylene Propylene Diene Monomer) for waterproofing. Its plasticiser-free chemistry offers extreme flexibility and total resistance to UV and ozone, guaranteeing watertight roofing with a service life exceeding 50 years.
Fig. 01 — Seam detail between two EPDM sheets. Sealing is not done with flame (as with bitumen), but chemically cold with primer and vulcanising tape, creating a joint stronger than the membrane itself.
Replace the logic of torch-welding with cold bonding. EPDM is the synthetic rubber membrane that revolutionised flat roof waterproofing, guaranteeing continuous, safe and dimensionally stable coverings for decades.
The secret of EPDM’s longevity lies in its cross-linked polymer structure. Unlike PVC membranes or bituminous sheets that require plasticisers to remain flexible — additives that evaporate over time under sunlight — EPDM is intrinsically elastic. Being free of volatile substances, its chemical composition does not change: a roof laid today will have the same elasticity (> 300%) and the same thickness even after fifty years.
EPDM maintains exceptional flexibility down to -45°C, and is produced in enormous sheets (often over 15 metres wide), enabling large roof areas to be covered in a single piece without seams. Where seams are necessary, no gas torch is used: overlaps are vulcanised cold with primer and polymeric adhesive tapes, completely eliminating the risk of fire on site.
Standards
European and international references applicable.
Physical properties
Usage environment
The EPDM is also the preferred material for green roofs. Its chemical composition is naturally root-resistant (DIN EN 13948), repelling root penetration without needing additional membranes or chemical biocides. Being inert, it does not release hydrocarbons or toxic substances into rainwater, making it certified for safe rainwater harvesting.
Documented applications
TAV. DBallasted Flat Roofs
Loose-laid membrane anchored only at edges, weighted by washed river gravel to resist wind uplift.
Green Roofs
Intensive or extensive systems where the membrane supports constant loads of wet growing medium and blocks root penetration.
Fully Adhered Waterproofing
Complex or curved roof shapes where the rubber is fully adhered to the insulation substrate.
Ponds and Bio-pools (Pond Liner)
Continuous lining for water features or natural swimming ponds, due to the total non-toxicity of the material.
Elongation at Break (Elastic deformation capacity - %)
TAV. EElongation indicates not only how much the material can stretch, but its capacity to follow thermal cracks or structural settlement movements without tearing, which would cause catastrophic water ingress.
Used in these processes
TAV. PUsed in these systems
TAV. SOperational documents from this sheet
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