back fill required

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back fill required

Postby knechtion » Fri Dec 16, 2005 8:50 pm

I have a subterrainian garage. How much backfill (dirt) will I need to fill 6ft deep by 4 ft wide by 90 feet long? :?: and how do I due the math to convert to yards?

Postby Guest » Wed Dec 21, 2005 1:40 am

Im assuming you have a 6' vertical wall and you need to go out 4' then slope it up to natural grade at a 1:1 slope.

wall backfill 6 x 4 x 90= 2160
1:1 slope 6 x 6 = 36/2 = 18 x 90= 1620
total = 3780/27 = 140 CY

One more thing when you compact 140 cubic yards it will shrink different amounts depending on what type of soil it is. 15% is pretty safe for most types though.

So actually you will need. 140 x .15= 21 + 140 = approx. 160 Cubic yards

hope this helps

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