What material must a built-up roof include?

A built-up roof must include a vapor barrier as it plays a critical role in preventing moisture accumulation within the roofing system. Built-up roofs, typically consisting of multiple layers of bitumen and reinforcing fabrics, require a vapor barrier to effectively manage moisture that could otherwise penetrate from the interior of the building. This barrier protects the insulation and structural elements beneath the roof, thereby prolonging the life of the roofing material and maintaining the building’s energy efficiency.

In addition to moisture control, incorporating a vapor barrier helps prevent the formation of condensation, which can lead to serious issues like mold growth and structural damage. Thus, the inclusion of a vapor barrier is essential for ensuring the overall integrity and functionality of a built-up roofing system.