Illinois Roofing Practice Exam

Which of these are NOT appropriate to protect expansion joints in low-slope roofing system?

1. Sealants.

2. Expansion joint covers.

3. Fascia cap metals.

4. Compression strips.

The correct answer is: Fascia cap metals.

The rationale for the selection of fascia cap metals as being inappropriate for protecting expansion joints in a low-slope roofing system lies in their primary function and design. Fascia cap metals are typically used to cover and protect the edge of a roof, providing an aesthetic finish as well as protecting against water intrusion and damage at the roof's perimeter. They are not designed to accommodate the movement associated with expansion joints, which are necessary to handle thermal expansion and contraction, as well as other structural movements within a roofing system. In contrast, sealants, expansion joint covers, and compression strips are specifically engineered for use with expansion joints. Sealants provide a watertight barrier that can flex with the joint's movement. Expansion joint covers offer protective surfaces that accommodate movement, and compression strips help fill gaps while allowing for expansion. Each of these options serves a critical role in ensuring the integrity and longevity of the roofing system in relation to these expansion points.