Preventing Water Damage & Frost Heave

What happens here

The final part of the explanation emphasizes the critical benefits of this comprehensive drainage system. By ensuring that water is not trapped in the soil directly behind the retaining wall, the system prevents several significant issues. Primarily, it mitigates the risk of freeze-thaw cycles where trapped water expands when frozen, creating immense pressure (known as frost heave) that can push the wall over, cause it to crack, or lead to other severe structural damage. This well-designed drainage system ensures the long-term longevity, stability, and integrity of the retaining wall and the entire raised patio structure.

Goal: Understand how the drainage system protects the retaining wall from damage.