Illinois Roofing Practice Exam

Which of these is the most accurate indicator to determine whether a low-slope roofing system should be recovered or replaced?

1. Age of the building

2. Number of windows

3. Deck deflections and fungal growth in roof membrane

4. Paint color of the roof

The correct answer is: Deck deflections and fungal growth in roof membrane

The most accurate indicator for determining whether a low-slope roofing system should be recovered or replaced is the assessment of deck deflections and fungal growth in the roof membrane. This option is significant because deck deflections indicate structural integrity issues, which can compromise the overall performance of the roofing system. If the deck is sagging or has deflected, it could lead to pooling water, which increases the risk of leaks and further damage to the roof. Additionally, the presence of fungal growth signifies that there is moisture retention, often a sign that the roofing material is failing or that there are underlying issues that need to be addressed. Identifying both of these conditions allows for a comprehensive evaluation of the roof's current state and its ability to perform effectively, providing essential information for deciding on recovery or replacement. In contrast, while the age of the building can provide some context regarding the roof's wear and tear, it does not directly assess the roof’s current condition or performance. The number of windows does not impact the roofing system's integrity and functionality. Lastly, the paint color of the roof is largely irrelevant to its structural issues or general condition and does not serve as an indicator for recovery or replacement decisions.