As performance, durability, and liability concerns increase, architects and specifiers are re‑evaluating sheathing options; particularly magnesium oxide (MgO)-based boards. This course provides a technical overview of MgO sheathing, focusing on how material chemistry affects moisture behavior, corrosion risk, long‑term durability, and system performance. The session reviews key properties of MgO boards versus traditional sheathing, lessons learned from early‑generation products, advancements in current MgO technologies, and quality control and testing methods used today. Fire performance is examined through NFPA 285 and combustibility testing to clarify when MgO systems are appropriate for commercial wall assemblies.

Upon completion of this course, the Learner should be able to:

• Discuss the difference between the chemistry of chloride- and sulfate-based magnesium oxide (MgO) composite sheathing boards, including cement chemical structure, additives, and the manufacturing process.
• Identify the properties of MgO-based boards and the benefits over traditional sheathing during the construction and long-term operation of commercial buildings.
• Address early board prototypes’ challenges and highlight advancements in MgO technology, both with stand-alone boards and within a complete wall system.
• Outline quality control measures, such as specific testing methods, and performance targets to ensure the supplied boards meet the requirements to provide a long-lasting performance in the building enclosure.
• Describe the performance of MgO systems in fire code testing, including NFPA 285 and combustibility testing, and be able to identify when they can and cannot be used.

Approximately 1 hour. Delivered via webinar or face-to-face presentation. Available sessions shown below.

View the DuPont Performance Building Solutions Privacy Policy

This course is registered with: 1 Industry Association(s)