The average tarpaulin used for advertising is 60-70% PVC, with an internal polyester fibre mesh. Source: Vinyloop.com. <-----------These folks are working on recycling tarpaulin material and they have a pilot project underway in Ferrara, Italy. The process involves separating the PVC from the fibers. The PVC is treated and recycled and the fibers can then be used to create polyester felt.
As they don't have a tarpaulin recycling plant here yet, and they don't qualify for the Calgary Blue Box recycling program, we might as well make stuff out of them!