The Ultimate Guide to Building a Brick and Mortar Retaining Wall
Aug 15, 2020 ... Today we're talking retaining walls! And I don't mean high tech, expensive retaining walls that are holding up a wall of mud....
Building a brick and mortar retaining wall is a foundational project that transforms a problematic slope into a functional and attractive landscape feature. This guide provides a clear pathway from initial planning to the final cap, focusing on the essential steps for a structure built to last. Success hinges on meticulous planning, precise execution, and the use of the right materials and techniques.
Planning and Design: The Blueprint for Success
The initial phase is arguably the most critical, setting the entire project's trajectory. Begin by assessing the wall's purpose, whether it's to manage water runoff, create a level terrace, or define a garden bed. Next, calculate the wall's length and desired height, which directly influence its structural requirements. It is vital to call your local utility services before any digging commences to avoid buried cables or pipes. A professional engineer should be consulted for walls exceeding three feet in height or those supporting significant loads, as they can perform a site-specific analysis and design.
Selecting Materials and Gathering Tools
The integrity of your wall depends on the quality of its components. For the facing, choose dense, weather-resistant bricks that complement your home's architecture; avoid using standard clay bricks intended for above-ground use, as they can deteriorate quickly when constantly exposed to moisture. The core of the wall requires strong, angular crushed stone, often referred to as base rock, which compacts firmly to provide stability. Essential tools for this project include a sturdy shovel, a tamper for compacting, a level for ensuring accuracy, a string line for alignment, a rubber mallet for precise placement, and a tape measure. Having a sturdy wheelbarrow and a heavy-duty work glove is also highly recommended.
Foundation Preparation: Digging the Trenches
A stable foundation is the bedrock of any great retaining wall. The process begins by excavating a trench that is significantly wider and deeper than the wall's intended base. The general rule of thumb is to dig a trench that is at least one-third the wall's intended height and width, creating a substantial footing for the load. For example, a three-foot-tall wall would require a trench approximately one foot deep and two feet wide. This space accommodates the base layer of crushed stone, which is critical for managing groundwater and preventing the wall from shifting over time.
Laying the Base and Installing Drainage
With the trench prepared, compact a four-inch layer of crushed stone using a tamper to create a solid, immovable base. On top of this compacted base, spread a one-inch layer of stone dust and level it carefully; this creates a stable and level surface for the first course of bricks. Before laying the bricks, it is crucial to install a perforated drainage pipe behind the wall. This pipe, wrapped in a porous landscaping fabric, is laid at the base, directly behind the bricks, and pitched slightly to direct water away from the wall's foundation into a designated exit point, such as a storm drain or a lower elevation.
Building the Wall Structure
Begin laying the first course of bricks directly on the prepared stone base, ensuring each brick is perfectly level and tightly interlocked. Use a rubber mallet to gently tap the bricks into place. It is essential to stagger the vertical joints between rows, much like a running bond pattern in masonry, to lock the structure together and prevent vertical cracks. As you build upward, use a level frequently to check that each course is straight and plumb. For taller walls, it is a good practice to slightly batter the wall, leaning it back into the hill for added stability.
Backfilling and Finalization
As the wall rises, backfilling is a concurrent process that provides essential pressure against the backside. After each course of brick is laid, add a four-inch layer of crushed stone behind the wall. This stone is then compacted firmly to create a solid anchor point, counteracting the lateral pressure of the retained soil. This process of laying brick and backfilling in increments is repeated until the wall reaches its final height. The final course of bricks should be set slightly below the finished grade to allow for the installation of capstones, which are typically concrete pavers or specially designed brick caps that shed water and provide a finished, protective top to the entire structure.
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