TPO is a fairly new roofing material when compared with other types. This means thatmany companies are still experimenting with different membranes. It is important for youto choose a company with a reputation for producing quality TPO roofing membrane toget the best durability and longevity out of your roof. If you purchase a cheaply made TPO roof, seam issues and membrane failures are common. However, with new ASTMstandards, TPO membrane quality has become more consistent and overall is a greatchoice for commercial roofing.