What is a fire safety hazard related to insulation?

A fire safety hazard related to insulation is the lack of fireblocking in chases. Fireblocking is a critical safety feature that helps slow down or prevent the spread of fire within wall cavities and structural chases, where insulation is often installed. When fireblocking is not properly implemented, flames and smoke can travel more easily through these spaces, which can lead to a faster and more dangerous fire spread within a building. Therefore, ensuring that proper fireblocking measures are in place is vital for enhancing fire safety and protecting the integrity of the structure as well as the safety of its occupants.

The other options, while potentially concerning in their own rights, do not directly represent a fire safety hazard in the same way. Excessive insulation thickness may lead to other issues such as reduced ventilation or moisture problems, but it isn't inherently a fire safety concern. Improper material selection may involve using materials that are not fire-resistant, but this does not directly address a systematic hazard like the lack of fireblocking. Additionally, insulation in unventilated spaces can cause moisture accumulation, but again, this relates more to potential mold and rot issues than fire safety specifically.