Ohio Certified Nursery Technician Practice Exam

To effectively prevent frost damage to landscape structures, footers should be installed at a depth that is at least 6 inches below the frost line. The frost line, also known as the frost depth, is the maximum depth at which soil temperature consistently reaches 32°F (0°C) during winter. When footers are placed below this level, they are less likely to shift or heave due to the expansion of frozen ground, which can occur when moisture inside the soil freezes and expands.

This practice helps to maintain the structural integrity of the landscape elements, such as decks, fences, and retaining walls, ensuring they remain stable regardless of seasonal changes. Proper footer installation depth is a fundamental practice in landscape architecture and construction that emphasizes durability and long-term performance in varying climatic conditions.