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Terraced Walls
Independent Terraced Walls
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 Build with a 2:1 ratio |
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 For each wall to be independent of the other, it must be built using a 2:1 ratio — the upper wall must be built a distance away from the lower wall of at least twice the height of the lower wall. In addition, the upper wall must also be equal to or less than the height of the lower wall. For example, if the lower terrace is 4 feet tall, the distance between the terraces must be at least 8 feet and the upper wall must not be higher than 4 feet. In some situations, the distance between walls may need to be greater. Consult with a qualified engineer.
Exceptions to this general rule include weak soil conditions or where slopes exist above, below or between wall locations.
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 Install drain tile |
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 Proper drainage is vital to maintaining stable, long-lasting terraced walls. Drain tile must be installed so that the water is directed around or under the lower wall. Never place the drain tile outlet for the upper wall above or behind the lower wall.
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Dependent Terraced Walls
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| Incorporate additional reinforcement |
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 When the distance between the lower and upper walls is less than twice the height of the lower wall, the walls become structurally dependent on each other. In this situation, it is important to take global stability into account, incorporating additional reinforcement — and longer layers — into the wall plan. In addition, structurally dependent walls require even more excavation, backfill and time. So plan ahead. Be sure to check the wall plan for specific requirements.
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| Consult with a qualified engineer |
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For structurally dependent walls, consult with a qualified engineer.
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