What does informational note guidance indicate about thermoplastic insulation?

The indication that thermoplastic insulation may stiffen at temperatures below 14 degrees Fahrenheit is significant because it highlights the behavior of this material under low-temperature conditions. Such stiffness can impact the performance of the insulation in colder environments, making it less effective in maintaining thermal resistance and could lead to issues in installation and application where flexibility is needed.

This characteristic is crucial for professionals to consider when selecting insulation for specific environments, particularly in regions that experience low temperatures. Understanding the thermal properties of the material ensures that it is used appropriately, adhering to code standards that aim for safety and efficiency in insulation applications.

The other statements, while they may seem plausible, do not accurately reflect the behavior of thermoplastic insulation; thus, it is essential to focus on the relevant characteristics stated in the correct answer.