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Using Rebar Stakes with Earthbags
Questions answered by Kelly Hart

Q: Should one use rebar reinforcement every 2 feet driven vertically through the bags.

A: This is not reallly necessary, except perhaps where you want to tie the wall into a bond beam.

Q: Why is it OK to use rebar through a bag? Doesn't it weaken the bag too much?

A: There only a few circumstances where it may be necessary to do this, but actually puncturing the bag with rebar does not substantially weaken it, and the fill material rarely leaks out.

Q: I saw this in a video called "Making the Soweto Hospice with Volunteers" where they said that it was not necessary to use the barbed wire because of these rebar stakes. I decided to do it like this because it´s cheaper. I could not afford the barbed wire, but if you tell me thatIi definitely need the barbed wire I will try to get some money to buy it.

A: We post lots of videos and pages about many different earthbag projects just to give readers as much information as possible. Ultimately it is your choice to decide how you want to proceed. I would say that 99% of the earthbag projects that I know about have used barbed wire, partly because that is how Nader Khalili, the architect who first popularized this technique, did it. Using stakes does help stabilize the wall, but the wire is just a bit better I think, especially if there were ever an earthquake that affected the house.

Q: I read an idea of just using rebar instead of bard wire, I guess that would work. What do you think?

A: As for using rebar instead of barbed wire, this has not been proven over time to be as stable as barbed wire to keep a structure intact, so I am not sure how well it will work. If that rebar is also incorporated into the bond beam at the top, this will certainly help stabilize the building. I doubt that using rebar stakes is any more economical than barbed wire, and may be more costly.

Q: If I were using rebar to avoid building buttresses on straight walls, how far is it recommended for them to be apart in a non-seismic area?

A: Stabilizing a straight wall with rebar pounded down through the wall might work if that rebar is also embedded in a bond beam at the top of the wall. I would suggest doing this at perhaps 2 - 3 foot intervals. Otherwise, for reinforcing with external rebar, you can consult these specs.

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