Quick Answer
To choose the right size polypropylene bags for earthbag construction, consider the diameter of the bags and how they will be used in the structure, whether for a dome or straight wall design, and how they will be secured with barbed wire.
Measuring for Polypropylene Bags
When selecting the size of polypropylene bags for earthbag construction, the diameter of the bag is crucial. For a standard earthbag structure, we recommend using 15-20 inch diameter bags. These bags are typically available in 1-2 cubic yard quantities, which can be filled with approximately 2,000-3,000 pounds of fill material.
Calculating Bag Quantity
To determine the number of bags needed for your project, calculate the surface area of the wall or dome you wish to build. A general rule of thumb is to use 1 bag per 100 square feet of wall surface. For a dome structure, you will need to calculate the surface area of the dome, taking into account the geometry of the shape. For a straight wall, simply calculate the length and height of the wall in square feet.
Securing the Bags
Once you have determined the size and quantity of bags needed, you will need to secure them using barbed wire. We recommend using a 10-12 gauge barbed wire to hold the bags in place. To install the wire, start at the bottom of the wall and work your way up, securing each bag to the one below it. Make sure to leave enough slack in the wire to allow for any settling of the bags over time.
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