Massive earthbag retaining walls like this are quite common

Massive earthbag retaining walls like this are quite common


I have to laugh when people keep asking me if earthbag building is strong. Earthbags (sand bags) have centuries of use by militaries worldwide, because they’re bomb, blast and bullet resistant. Millions of sand bags are used each year for flood control to stop raging rivers. As well, earthbag building is earthquake and hurricane resistant.

Massive earthbag retaining walls like the one in the photo above are now fairly common. The US Department of Transportation uses so many polypropylene sand bags for retaining walls along highways that they did an accelerated aging test to help determine the lifespan. The study showed polypropylene bags protected from sunlight may last over 500 years, and there is no effect from moisture. See my Earthbag Building ebook and DVD for details and complete step-by-step building information.

Image source: Flexmse.com


Comments

Massive Earthbag Retaining Walls — 12 Comments

  1. Just curious to know if in Canada you would use a footing underneath a retaining wall made of earthbags. The wall is 9 feet high.
    Thanks

    • I don’t think that a footing is generally required under a retaining wall, especially if adequate drainage is established behind it, with weep holes, etc.

  2. I will put new soil on my plot before I build a house. I live in Thailand. I want to build a 60 cm underground retaining wall, so that the soil doesn’t wash away to the neighbors. Should I use gravel or sand ? Good idea to plant bushes near so that roots link-in ?(p.s. Thai builders insist on 3000$ concrete underground wall)

    • I think you could use either sand or gravel effectively for such a short retaining wall. Plantings in the area would also help retain the soil.

  3. What did they use for UV protection here?

    Thinking of using for a 4 metre high retaining wall:

    Rebar and drain pipes, with additional concrete post and anchors if necessary.

    Temporary UV protection with regular, cheap paint
    Final coat with regular cement plaster

    The wall will eventually be furnished with vines and other vertical perennials.

    Will this work? Do any experts out there have any concerns?

  4. Dear Owen,

    Thank you for your continued hard work in promoting EBB and helping the greater community.

    Question regarding the EB retaining wall. What do you think these bags were covered with to help with protection from the UV rays? Do you have other suggestions from what they have used as well?

    All best.

    • It’s hard to say because we don’t know what the final retaining wall looks like. These bags are probably industrial spec with high UV rating. Maybe the bags are covered with mesh, more soil and plants? I don’t know.

        • Again: These bags are probably industrial spec with high UV rating. Maybe the bags are covered with mesh, more soil and plants? I don’t know.

          The most affordable solution is to build quickly (within a few weeks), get the roof on and first coat of plaster as soon as possible. Next best would probably be to apply a thin coat of recycled latex paint.

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