What could be a consequence of not covering vapor diffusion-retarders in attics?

Not covering vapor diffusion-retarders in attics can lead to a higher fire risk due to the potential for trapped moisture to create conditions that support mold growth and wood rot. Vapor diffusion-retarders are designed to minimize moisture movement into the insulation and structural components, which helps maintain the integrity of the materials and reduces the likelihood of creating a damp environment.

When these retarders are not adequately covered, insulation can become saturated with moisture, reducing its effectiveness and potentially leading to a situation where organic materials, such as wood, become compromised. This not only weakens structural components but can also create an environment conducive to fire hazards if mold or rot progresses and changes the overall composition and safety of the attic space. Additionally, any electrical components that may be present are more at risk when exposed to excess moisture, further increasing the fire risk.