Beginning in the early 80s, the Atlas commercial polyiso division began to fill the need for a growing foam insulation demand from the single-ply roofing industry. Instead of entering into membrane manufacturing, Atlas has remained the sole provider of polyiso roof insulation without a membrane system. This autonomy has given Atlas the flexibility to work with many industry-leading manufacturers of membranes, promoting wide-ranging advancements in rigid board insulation technology and performance. Atlas offers a full line of polyiso insulation board, including tapered and nailable.