Termite and moisture risk mitigation strategies are commonly used in tropical construction.

• A. Termite barriers and treated lumber are unnecessary in tropical construction.
• B. Moisture control (grade, slopes, drainage), proper ventilation, regular maintenance, and moisture barriers.
• C. Heavy chemical treatments are the only necessary measure.
• D. Termite barriers, treated lumber, moisture control (grade, slopes, drainage), proper ventilation, and regular maintenance are used.

Answer: (D)

In tropical construction the risks of both termites and high moisture are elevated, so a protective approach must address both entry paths and environmental conditions. Termite barriers physically block termites from reaching the timber, while treated lumber provides ongoing resistance where wood is used. At the same time, controlling moisture is essential: proper grading, slopes, and drainage prevent standing water and encouraging moisture buildup; moisture barriers help stop moisture from wicking into building materials; and good ventilation lowers indoor humidity, reducing conditions that termites and decay organisms favor. Regular maintenance keeps barriers intact, leaks repaired, and any damage or degradation promptly addressed. Putting these measures together—termite barriers, treated lumber, moisture control, ventilation, and maintenance—gives the most complete protection in tropical settings. Choices that omit any of these key elements are incomplete for the tropical risk profile.