I have a 20' x 20' square. I want to fill it with 2.5" of sand. How many tons of sand am I going to need? Thank you.
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Re: How much sand do I need?
Originally posted by UnregisteredI have a 20' x 20' square. I want to fill it with 2.5" of sand. How many tons of sand am I going to need? Thank you.
Sometimes it is sold by the ft³, by the yd³, or the ton.
1 yd³ = 27 ft³, so 3.1 yd³, and DRY sand is 1.35 ton/yd³, so about 4.17 ton. Be sure the sand is dry or you'll be buying up to an extra 1.2 ton of water.

Re: How much sand do I need?
I see that someone else got some good help on the sand thing. I could use a little math help myself. I am about to install one of those easy set pools that rise as you fill it. There is an ever so slight grade in my yard so I want to put a base of sand down and level it out. I think about a 1.5" base would do the trick or maybe even 2". The pool is 16' and the ground cover I believe is 18x18 so I would like the base of sand to be 18'x18'x2". How many 50lb sand bags would I need? Thanks in advance for any help!!
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Re: How much sand do I need?
Originally posted by Krista View PostI see that someone else got some good help on the sand thing. I could use a little math help myself. I am about to install one of those easy set pools that rise as you fill it. There is an ever so slight grade in my yard so I want to put a base of sand down and level it out. I think about a 1.5" base would do the trick or maybe even 2". The pool is 16' and the ground cover I believe is 18x18 so I would like the base of sand to be 18'x18'x2". How many 50lb sand bags would I need? Thanks in advance for any help!!
Dry sand weighs approximately 88.9 pcf (pounds ft^{3}), so 1.2 tons/yd^{3}.
Damp sand weighs approximately 105.6 pcf, so 1.425 tons/yd^{3}.
Wet sand weighs approximately 114.8 pcf, so 1.55 tons/yd^{3}.
For an 18 ft square area with 2" of damp sand:
18 ft x 18 ft x (2”/12”),
18 ft x 18 ft x 0.167 ft = 54 ft^{3}
54 ft^{3} / 27 ft^{3} = 2 yd^{3}
2 yd^{3} x 1.425 tons/yd (damp sand) = 2.85 tons
Although you don't say, most above ground pools are round. If the pool is round, the formula for area of a circle is: ∏r^{2}, so for an 18 ft circle:
∏ x 9^{2} = 254.47 ft^{2}
254.47 ft^{2} x 0.167 ft = 42.41 ft [sup]3[/sup]
42.41 ft[sup]3[/sup] / 27 ft^{3} = 1.57 yd^{3}
1.57 yd^{3} x 1.425 tons/yd (damp sand) = 2.24 tons
If a 50 lb bag of sand states it's 0.5 ft^{3}, you are correct, you will need approx. 108 bags. However, bagged sand is a lot more expensive than bulk material. If a sand & gravel pit is "just down the road", you should be able to get 3 tons delivered cheaper than purchasing 108 bags. It's also a lot less time and energy for you and less wear and tear on your truck!
If you haul this in a pickup, check the owner's manual for maximum cargo weight so you don't overload the truck. It may be "just down the road", but an overloaded vehicle has less stability and thus, less control.
GeorgeLast edited by Dirtman; 07042009, 11:52 PM.
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Re: How much sand do I need?
Originally posted by Krista View PostWOW! Thank you so much for your help! The ground cover is a square tarp. The pool is round, however, I want to do a square pad of sand under the ground cover tarp.
Thank you thank you thank you for your help!
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Re: How much sand do I need?
Originally posted by Unregistered View Postfor either 12x23x3"thick or 12x24x2"thick. how many scoops will i need?
12 feet * 23 feet * (3 inches / 12) feet = 69 cubic feet
12 feet * 24 feet * (2 inches / 12) feet = 48 cubic feet
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