Foundations & Drainage

The order a segmental retaining wall goes together

A segmental wall goes together over time, not in layers added at the end: excavate a level trench, compact a stone base and bury the first course, then stack courses with a setback while the drainage stone, pipe and geogrid rise with the wall, and finish with glued caps, filter fabric, and grade pitched away.

Source: Build order for segmental walls to ~4 ft per NCMA / IRC (taller walls need a P.E.)

What this diagram shows

A four-panel walkthrough of the segmental retaining-wall build order in cross-section. Panel 1: a level trench is excavated below grade, wide enough for drainage stone behind the block line. Panel 2: a compacted stone base is placed and the first course of block is leveled and buried below grade. Panel 3: courses are stacked with a setback while a drainage-stone chimney, a perforated pipe at the base, and geogrid reinforcement into the retained soil rise with each course. Panel 4: capstones are glued on with a front overhang, filter fabric is folded over the top of the stone, and the finish grade is pitched away from the wall.

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How To Build A Retaining Wall

This diagram appears in our in-depth guide.

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