United Statess Tennessee Imperial Black Limestone is a durable and dense natural stone, typically suitable for both interior and exterior applications. However, when it comes to using it in very humid climates, there are a few factors to consider:

1. Porosity: Limestone, in general, is a porous material that absorbs moisture. In humid climates, where there is a higher level of moisture in the air, the limestone may absorb more water, which can lead to issues like efflorescence or discoloration.

2. Sealant: Applying a high-quality sealant specifically designed for natural stone can help protect the Tennessee Imperial Black Limestone from moisture absorption. The sealant creates a barrier that prevents water from penetrating the surface, reducing the risk of damage.

3. Maintenance: Regular maintenance and cleaning are crucial in humid climates to prevent moisture buildup on the limestones surface. Regularly removing any dirt, debris, or algae growth and ensuring proper drainage around the area can help prolong the stones life.

Ultimately, while Tennessee Imperial Black Limestone can be used in exterior applications in very humid climates, proper care and maintenance are essential to ensure its longevity. Its advisable to consult with professionals or suppliers familiar with the specific stone and climate conditions to determine the best practices for installation and maintenance.