Composite board should not be used for which application?

Composite board is a manufactured material composed of wood fibers, resins, and other additives, designed to offer certain advantages like resistance to rot and ease of installation. However, its characteristics also define limitations in terms of applications.

In roofing, the material is exposed to harsh weather conditions, including moisture, temperature variations, and UV radiation. Composite boards may not provide the required durability and resistance to these elements that roofing materials typically need. They can become damaged or degrade over time when subjected to water exposure, leading to potential leaks and structural issues.

Conversely, applications such as sheathing, subflooring, and interior walls can utilize composite board more effectively due to the relative protection from direct exposure to the elements. These environments are generally more controlled, allowing composite board to perform adequately without the same risks associated with roofing applications.

Therefore, the application of composite board in roofing is not advisable due to its susceptibility to water damage and degradation under prolonged exposure to the elements.