Using IMP Roofs Over Decking
Insulated metal panel (IMP) roofs are known for light steel roll forming machine being low maintenance, energy efficient and durable. As with all roofing systems, the longevity and proper performance of the roof relies on proper design and installation. When roof IMPs are installed over decking, there are a few important differences to consider versus application over open purlins or joists. Roof System Differences Between Pre-Engineered and Structural Steel Pre-engineered buildings are designed with integral cross bracing in the roof, eliminating the need for decking. IMPs are then attached directly to the top flanges of roof purlins, where they can help provide stability against purlin roll under roof loads. However, in structural steel buildings metal decking is commonly used in lieu of diaphragm bracing. The use of decking is a relatively economical way to brace the roof against building movement caused by various loads acting on the building (wind, snow, seismic, etc.). I