For protection from weather-related catastrophes, placement is the most important factor. If you're worried about safety from intruders, most experts say the room needs to hold long enough for the police to arrive, usually 30 minutes to a couple of hours. Soil costs between $12 to $18 USD per cubic yard.The big decisions depend on the purpose of the panic room.For example, if it's 1.5 foot (0.46 m) tall and you want a 15 foot (4.6 m) tall bunker, you need 7.5 layers (15/1.5). Now, use this to determine how many layers you need. After determining how many bags you need per layer, fill up one bag and measure it's height. Earth bag height will vary depending on how they're filled.For example, if each layer requires 4,608 bags and you need 6 layers, you need 27,648 earthbags in total (6 x 4,608). Multiply the total number of bags needed per layer by the number of layers for the total bags for your structure.This means that total amount of bags per layer is 2,304 x 2 (since there are 2 lengths and widths 2 per layer), or 4,608. Consider a bunker that is 240 feet (73 m) long and wide: it requires 1,152 bags for both the length and width-240 feet (73 m) divided by 2.5 inches (6.4 cm)-which is a total of 2,304 for 1 length and 1 width.After determining the length and width of your bunker, buy the appropriate number of bags needed to cover this space. If you're looking for the simplest method of creating your bunker structure, this is the way to go.
Earthbags are low-cost structural materials that can be purchased from online suppliers. Buy 1.5 by 2.5 in (3.8 by 6.4 cm) earthbags for a low-cost solution.
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