Economics/logistics come into play here. Depending on the size of the flatbed, it typically takes 60,000-100,000 sf of safely bundled and packaged aged PVC roof to fill out a flatbed. Full flatbeds are ideal for shipping to the recyclers. In some cases, recyclers will pay for the full flatbed. Partial flatbeds will most likely require additional freight costs or potentially consolidation fees.  Any size PVC roof can be recycled, but it is recommended that you contact your PVC roof manufacturer of choice for their recommendations. In some regions, smaller sized roofs can be sent economically to a regional recycler. In other regions where long transportation distances to a PVC recycler may be needed, it may be necessary to consolidate several re-roof jobs to make a load of PVC membranes to ship to the recycler.