General Contractor Practice Exam

What potential issue may arise from using mechanical fasteners on foam insulation on a concrete wall?

1. It may compromise insulation performance.

2. They may corrode quickly.

3. They may not hold properly.

4. They are too heavy.

The correct answer is: It may compromise insulation performance.

Using mechanical fasteners on foam insulation attached to a concrete wall can potentially compromise insulation performance. This is primarily because mechanical fasteners can create thermal bridges that allow heat transfer through the insulation, reducing its overall effectiveness. The fasteners can penetrate the foam, disrupting its continuous insulation layer, which is essential for minimizing energy loss and optimizing thermal resistance. While other issues related to fasteners, such as corrosion, inadequate holding strength, or weight, may also be relevant considerations in different contexts, the primary concern with foam insulation is its thermal integrity. Getting a good insulation performance is crucial in maintaining energy efficiency in the building envelope, and any disruption that leads to reduced insulation effectiveness is a significant issue.