Retaining Wall in Sand

Old 07-10-22, 03:02 PM
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Retaining Wall in Sand

Hello All. I am planning on building a 3-4' high x 20' long retaining wall by next year. Live in a coastal area and my yard is basically sand.

Been researching a ton. I cannot find a definitive answer. Do I need to utilize 3/4 stone for the base/footing material? Or could I just use the sand that's there?
Old 07-10-22, 11:21 PM
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You will absolutely have to remove sand and replace with some type of compactable material. Sand is not a stable material to build on,
Old 07-11-22, 04:54 AM
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I agree. You definetely need a compacted stone base.
Old 10-20-22, 07:09 PM
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Per section R403.1 some kind of foundation is required. Given the unstable nature to sand I would suggest having the retaining wall properly engineered by a licensed professional. Retaining wall design requirements are in code Section R404.4.

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Last edited by IBtyen; 10-21-22 at 10:49 AM.

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