Illinois Roofing Practice Exam

How should insulation be installed over cementitious wood fiber deck panels?

1. Insulation should be loosely laid without secure fastening

2. Insulation should be directly placed on the deck with no intermediate layers

3. With adhesive applied to a base sheet that is mechanically attached to the deck

4. Insulation should only be installed on metal decks

The correct answer is: With adhesive applied to a base sheet that is mechanically attached to the deck

The correct approach for installing insulation over cementitious wood fiber deck panels involves using a method where adhesive is applied to a base sheet that is then mechanically attached to the deck. This method not only provides stability and support for the insulation but also ensures proper adhesion, reducing the risk of movement or displacement during harsh weather conditions or due to building settling. The mechanical fastening combined with adhesive creates a secure and effective roofing system, enhancing overall insulation performance. Other methods, such as loosely laying the insulation or placing it directly on the deck without any intermediate materials, can lead to issues with insulation performance and do not provide the same level of security or efficiency. These alternative methods may leave the insulation vulnerable to wind uplift and other external forces, leading to potential damage or failure of the roofing system over time. Installing insulation solely on metal decks is not applicable here, as the focus is on cementitious wood fiber deck panels, reinforcing the need for the selected method combining adhesive and mechanical attachment for optimal results.