What is true about the use of treated lumber to prevent termite infestations?

The use of treated lumber is commonly recognized for its protective properties against termite infestations, particularly in underground applications. Treated lumber is infused with chemical preservatives that make the wood resistant to decay and insect damage, including from termites, thus providing a long-lasting solution when used in environments where it may be subject to moisture and direct contact with the soil.

Treated lumber can be effectively utilized in foundations, fence posts, and other structural elements that are in contact with the ground. The chemicals used in the treatment process create a barrier that deters termites from feeding on the wood, helping to protect the integrity of structures that might otherwise be vulnerable.

The other options misunderstand the application and effectiveness of treated lumber. It is indeed suitable for outdoor structures, especially those that are in contact with the ground. While it is true that treated lumber is particularly effective in below-ground applications, it is also valuable in above-ground uses. Therefore, treated lumber can be used successfully in various applications, and while building codes may regulate its use, outright prohibition is not common.