Using cover boards is an integral part of creating a roofing assembly. A cover board is a thin substrate to which a roof membrane is adhered. However, the use of a cover board far exceeds that of a substrate – it also serves as a critical component that helps to extend the life of a roof. Without a cover board, the roof is missing added durability: the building is more susceptible to hail, fire and wind damage. Hail is damaging to insulation, but by using a cover board, the impact is minimized. Insulation damage results in a reduction of the roof’s thermal resistance or R-value. R-value is the measure of heat flow through a material. The higher the R-value, the greater the resistance of heat flow through it. Hail damage on a roof without a cover board can easily pierce the insulation, which will increase the heat flow through it, thereby increasing the energy cost of the building. Read more.