EPDM Membrane is a superior water proof membrane is used to create an airtight and water-tight seal to protect wooden substructures against unwanted moisture.
The benefits of EPDM is that it can help reduce your carbon footprint by reducing heat loss.
EPDM stands for Ethylene Propylene Diene Monomer which is a type of synthetic rubber that is highly resistant to UV radiation, Ozone and other environmental factors.
This would be fitted at least as wide as the vertical batten.
Roll size 100mm x 20m.