Which construction type is an exception for needing interior perimeter treatment of the foundation?

Monolithic slabs are a specific type of foundation that is poured all at once to form both the slab and the footing, creating a single solid piece. When it comes to termite treatments, these types of foundations typically do not require an interior perimeter treatment because they are less susceptible to termite infestations compared to other construction types, such as basement walls or raised foundations.

Basement walls offer a more conducive environment for termites due to the vertical structure and the potential for moisture accumulation, which is more inviting for their activity. Raised foundations also provide spaces where termites can thrive, as the exposed wood and crawl spaces make it easier for termites to access the home.

Slab-on-grade is similar to a monolithic slab but is often not a single continuous pour. Depending on its construction features, it might still require treatment along the interior perimeter to prevent termite intrusion. Hence, the exception in needing interior perimeter treatment applies specifically to the monolithic slab type foundation, making it the correct answer.