EPDM roofing membranes last up to 15 years, while PVC membranes have a maximum lifespan of 30 years. In terms of cost, PVC roofing membranes are more expensive compared to EPDM as they require specialised installation equipment. It also depends if you prioritise weather resistance or seam strength. PVC seams are stronger, while EPDM has the best weather resistance properties.