Retaining walls are important structural elements that make up the cornerstone of landscaping, construction, and erosion control projects. In order for your retaining walls to stand the test of time, two key factors must be addressed: waterproofing and drainage.
Proper waterproofing protects retaining walls from water seepage, which can weaken the structure and compromise its integrity. Likewise, effective drainage prevents hydrostatic pressure from accumulating behind the wall, helping to avoid potential structural failures.
Here’s a closer look at how to set your next retaining wall project up for success:
What Is A Retaining Wall?
Retaining walls are engineered structures built to hold back soil and resist the lateral pressure that comes with changes in elevation. Whether supporting a hillside, framing a landscape, or protecting a foundation, these walls are critical for maintaining stability in sloped or uneven terrain.
Unlike freestanding walls, a retaining wall is designed to counteract the natural movement of earth, preventing erosion, washouts, and collapse. It allows for sharp grade transitions—such as terraces, raised beds, or building pads—by anchoring soil securely in place. Properly constructed retaining walls distribute pressure evenly, manage drainage, and help protect adjacent structures from shifting or settlement.
Retaining walls can be built using a variety of materials depending on the structural load, aesthetic preference, and budget:
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Concrete (poured-in-place or precast) for strong, permanent installations
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Concrete masonry units (CMU) or segmental retaining wall blocks for modular, stackable designs
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Natural stone for a more traditional, decorative appearance
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Timber for residential or short-term landscape applications
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Gabion baskets filled with rock for erosion control and rugged, flexible construction
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Reinforced earth systems that integrate geogrids, soil nails, or drainage composites for large-scale civil projects
Each material type offers different strengths, drainage capabilities, and installation methods—making it important to select the right system for your specific site conditions and structural requirements.
Keys To Effective Retaining Wall Waterproofing and Drainage
If you want your retaining wall to remain functional for years to come, you’re going to need effective waterproofing and drainage systems. Without these systems, water can accumulate behind the wall, increasing hydrostatic pressure and risking structural failure.
Retaining wall drainage and waterproofing can come in the form of strategically placed drainage pipes, filter fabrics, and drainage holes. Vapor barriers and Enka® drainage layers can make this a reality by mitigating hydrostatic pressure, channeling water safely away from the wall, and preserving the structure’s integrity for years.
Vapor Barriers and Retaining Walls
Vapor barriers play an important role in retaining wall waterproofing by effectively managing moisture. Americover’s vapor barriers help prevent moisture infiltration and maintain structural integrity.
Vapor barriers do this by halting the upward movement of moisture through capillary action. This allows you to maintain dry and structurally sound retaining walls. They can also direct water towards designated drainage systems, effectively preventing water accumulation.
Related Article: Best Vapor Barriers for Walls
Enka® and Retaining Walls
Enka® products can also play a major part in effective retaining wall drainage. These systems provide advanced, flexible solutions to address hydrostatic pressure and water infiltration behind retaining walls.
They efficiently channel water away from the wall, allowing it to flow unimpeded, while their geotextile filter fabrics prevent soil particles from entering and clogging the drainage pathway. By maintaining a clear, consistent flow path, Enka® products ensure the drainage system remains operational and effective over time.
Related Article: What is the Difference Between Woven and Non-Woven Geotextile Fabric?
Get Your Retaining Wall Waterproofing and Drainage Products Today
Americover offers industry-leading waterproofing and drainage products that deliver long-term protection for retaining walls. Here are some of our team’s favorite recommendations:
- Enkadrain®: This lightweight drainage core features geotextile layers designed for multi-directional water flow. Enkadrain® effectively prevents hydrostatic pressure and promotes optimal drainage behind retaining walls.
- Enkamat®: A durable, 3D nylon mat specifically engineered for slope stabilization and moisture control. Enkamat® protects slopes adjacent to retaining walls, reducing soil erosion and improving overall stability.
- Pro Crawl Anti-Mold Vapor Barrier: Americover’s 10 mil Class 1 vapor barrier features a glossy white finish, excellent tensile strength, and superior moisture-blocking capabilities. This robust vapor barrier protects retaining walls from moisture vapor damage, preventing structural deterioration and mold growth.