All of these systems are single ply membranes and they all can be installed in a variety of ways including ballasted, fulladhered or mechanically attached. The membranes are manufactured by only a handful of companies and they are all pretty much equal, so we will not name names. The product or system needed to protect your building depends on your needs. The following is a quick overview of what's available in commercial roofing today. For an in depth review of your roofing needs, please call us at, 617.908.5162 and we will be happy to guide you to your new roofing system.