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I need help determining how many bags that I will need.

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The design below is a dumbed down / stripped version of the final house design. It does not include any interior stick-construction or anything of that nature. It's simply the walls. I've included several images include the spec sheet listed on the top-view. I am uncertain how best to go about determining how many bags would be needed to complete such a design and am hoping others can assist with helping me determine this. Although the cost of bags are relatively low I would prefer to not over-buy, as they say, a penny saved is a penny earned.

The specs for the buttresses were not included, but they are 6 feet tall and 1.5' wide and thick. The lower most buttresses are 3 feet tall and 1.5' wide/thick. I am not certain if buttresses would be needed for this design and a wall height of 8 feet but included them in the design anyhow for aesthetics.

It should also be noted that technically there would be an extra foot of bags under ground as part of the foundation so I guess technically the walls would require 9' of bags.

Thanks for the assistance, it's much appreciated.
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Here is a quick and dirty way on determining how many bags you would use.

Depending on your bag size, you will usually get a bag that is 5-6 inches tall, and 20 inches long when full of earth. So for a 9 foot tall wall, you would need about 18 to 20 rows.

You are looking at walls 12-15 bags wide, and 20-24 bags long. Lets go to the upper limit on this. That gives you about 78-80 bags per row. Multiply that by height = 1560 bags for your outer wall.

If you want the inner walls built with earth bags you would add 600. So you are looking at 2160 bags.

That number is without taking any bags out for the doors or windows, adding extra for half bags and mishaps or loosing any to the better half who wants to bag potatoes. I would go ahead and order 2500 to be on the safe side.
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