Which roofing system relies heavily on existing system adhesion for wind-uplift resistance?

The choice of adhered systems is correct because these types of roofing systems are specifically designed to rely on strong adhesion to the substrate below them for stability and performance. In adhered roofing systems, materials such as membranes are glued directly to the roof deck using adhesives. This bond is crucial, especially for wind-uplift resistance, as it helps to keep the roofing material securely in place during high wind events. The effectiveness of this system depends directly on the quality and application of the adhesive, making adhesion a critical element in their performance.

In contrast, ballasted systems use weight to hold down the roofing material and may not depend on fastening or adhesion as directly. Mechanically fastened systems utilize physical fasteners to attach the roofing materials to the substrate, and while they can resist wind uplift, they do not rely solely on adhesion. Liquid applied systems form a seamless membrane over the surface but do not emphasize existing system adhesion like adhered systems do. Thus, the importance of adhesion in the context of adhered systems makes it the correct answer.