Which type of construction does not typically require interior perimeter treating of the foundation?

Monolithic slab construction is a type where the foundation and the floor are poured as a single continuous piece of concrete. This design significantly reduces the likelihood of moisture issues and pest entry compared to other types of construction, such as crawl spaces and basements, where there is often a greater risk of wood-destroying pests due to gaps and access points.

In monolithic slab construction, since the foundation is solid and integrated, there are fewer opportunities for pests to gain entry. As a result, interior perimeter treatment—a pest management practice typically used to protect against infestations in spaces that may offer conducive conditions for pests—is not usually necessary. In contrast, crawl spaces and basements can create environments that retain moisture, making them more susceptible to wood-destroying pests, warranting perimeter treatments to prevent infestations. Floating slabs may also require some perimeter treatment due to potential gaps or areas of vulnerability.

Thus, the distinct characteristic of the monolithic slab being a unified concrete structure is the reason it typically does not require the same level of interior perimeter treatment as other construction types.