Illinois Roofing Practice Exam

Which of these is least likely a result from ponding or poor roofing system drainage?

1. Increased risk of leaks

2. Roof membrane degradation

3. Immediate changes in slope and structural integrity of the deck

4. Reduced energy costs for heating

The correct answer is: Immediate changes in slope and structural integrity of the deck

The least likely result from ponding or poor roofing system drainage is the immediate changes in slope and structural integrity of the deck. While prolonged ponding can certainly lead to long-term structural issues, immediate changes in the slope or structural integrity are not typically a direct consequence of poor drainage. Ponding water can cause added weight on the roofing system, and over time, this may lead to deterioration of the deck structure or other components, but such changes generally occur gradually rather than instantly. In contrast, risks like leaks and roof membrane degradation can occur relatively quickly due to water accumulation and the stress it places on roofing materials. Additionally, the consideration of reduced energy costs for heating is unlikely, as ponding water and poor drainage generally lead to increased energy costs due to the potential for thermal inefficiencies, rather than savings.