What does a chemical barrier typically protect against in a building?

A chemical barrier is specifically designed to protect against pest infestations, particularly termites. This method involves applying a chemical treatment to the soil around and beneath a building’s foundation. The active ingredients in the chemicals used create a protective zone that deters termites from entering the structure. Termites can cause significant structural damage if they invade a building, which is why establishing a barrier against them is crucial in pest control strategies.

In contrast, the other options focus on different types of damage or issues that do not fall under the purview of chemical barriers. Water damage, rodent entry, and moisture retention involve different management strategies that are not effectively addressed through chemical barriers meant for insect control.