A cover board is a layer of rigid insulation or other flat material that is installed over the roof deck before the roofing membrane is applied. The purpose of the cover board is to provide a smooth, even surface for the roofing membrane and to protect the underlying insulation from damage.
Cover boards can be made from a variety of materials, including fiberboard, gypsum, perlite, and high-density polyisocyanurate. They are typically installed in a single layer, although multiple layers may be used for added protection or to achieve specific design requirements.
Some of the benefits of using a cover board in a roofing system include:
- Improved wind uplift resistance: Cover boards can help to improve the wind uplift resistance of the roofing system, especially in areas with high wind loads.
- Enhanced durability: Cover boards can help to protect the underlying insulation from damage caused by foot traffic, construction debris, and other sources of wear and tear.
- Increased thermal performance: Some types of cover boards have insulating properties, which can help to improve the overall thermal performance of the roofing system.
Overall, the use of a cover board can help to improve the performance and longevity of a roofing system, while also providing a smoother and more even surface for the roofing membrane to be applied.