How to Build a Sandbag Wall

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Build a Sandbag Wall
Build a Sandbag Wall (Image: Pamela Gardapee)

Knowing how to build a sandbag wall correctly ensures that the wall will serve its purpose in the event of a flood. Placing the bags correctly helps the wall hold back the flood waters to prevent them reaching a building or grounds you want to protect. The hardest part of placing the sandbags is carrying the weight of each bag. However, with assistance from at least one other person, you can easily build a wall to hold back the water.

Things You'll Need

  • Sandbags
  • Sand
  • Plastic tarp
  • Shovel

Buy sandbags at a local hardware store such as Home Depot, Farm and Fleet or Menards. If you prefer to order sandbags online, Flexible Packaging carries different types. Determine how many bags you would need to complete the wall.

Purchase sand. You can find sand at a local hardware store or construction material outlet that carries gravel and sand. Some plant nurseries may also carry sand for filling the sandbags.

Hold open a bag, while another person uses a shovel to load the sand into the bag. Fill the sandbag to 4 inches from the top so that you will have a flap at the open end. If you're using a drawstring bag, close the bag by pulling the string. Otherwise close the bag as directed by the manufacturer.

Place plastic tarp on the ground and halfway up a home exterior wall if using the sandbags as a barrier in doorways and basement window wells. If you're building a wall away from a building, you won't need the tarp.

Place the first row of sandbags on the ground. Make sure that each one is tight against the next. If the sandbag has a flap on one side, place the flap under the next sandbag.

Start the next row on top of the first. Stagger the placement of sandbags, as in the figures.

Continue building the wall upwards until you reach the height you need. Stagger each row.

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