Which statement is incorrect regarding insulated concrete slab floor construction?

In insulated concrete slab floor construction, the requirement is that both the insulation and vapor barrier should ideally be continuous to ensure effectiveness. A continuous vapor barrier is crucial because it restricts moisture from penetrating through the slab, which could lead to issues such as mold growth or structural damage over time. Similarly, continuous insulation helps maintain thermal efficiency, reducing heat loss and improving energy efficiency.

When analyzing the other statements: the assertion that insulation does not need to be continuous is incorrect since gaps in insulation can lead to thermal bridging, decreasing the overall effectiveness of the insulation. The idea that insulation can be installed only around the perimeter implies that it does not address the entire slab area, which is not recommended for optimal thermal performance. The role of the vapor barrier is indeed to prevent moisture from below, contributing to a healthier indoor environment and structural integrity.

Therefore, the emphasis on the need for both insulation and vapor barriers to be continuous is a crucial principle in insulated concrete slab construction, making the statement about their necessity incorrect.