What is a potential issue with insulation depth in newer houses?

In newer houses, a common potential issue with insulation depth is that it may be less than the normal depth required for optimal thermal performance. This situation often arises due to changes in building practices, materials used, or local building codes that may not be sufficiently updated to reflect current best practices in insulation. Inadequate insulation depth can lead to poor energy efficiency, increasing heating and cooling costs and reducing overall comfort within the home. Ensuring that insulation meets or exceeds the recommended depth is crucial for maintaining energy efficiency and preventing issues such as condensation or mold growth.

The other options do not accurately capture the typical concerns related to insulation depth in newer constructions, where issues such as insufficient insulation depth are more commonly observed than excessive depth or guaranteed adequacy.