Illinois Roofing Practice Exam 2026 – The Comprehensive All-in-One Guide for Exam Success!

The statement indicating that rigid board insulation may increase the probability of condensation occurring inside the roof system is accurate due to the thermal properties and functionality of rigid board insulation. When rigid board insulation is installed in a low slope roofing system, it can create a temperature differential between the exterior and interior surfaces of the roof. This differential can lead to condensation if warm, humid air comes into contact with cooler surfaces.

In low slope roofing systems, the correct placement of insulation is crucial. If the insulation is not installed correctly, or if there are air leaks or insufficient ventilation, moisture-laden air can become trapped. This can create conditions favorable for condensation to form on the underside of the roof deck or within the insulation layer itself, potentially leading to subsequent moisture-related issues such as mold, mildew, or structural degradation.

This understanding highlights the importance of not only the materials used but also the overall roofing assembly and environmental conditions. Proper ventilation and moisture management strategies must be considered in conjunction with rigid board insulation to mitigate condensation risks effectively.