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  #1  
Old 06-01-2009, 10:11 AM
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Default How much sand do I need?

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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  #2  
Old 06-01-2009, 10:37 AM
JohnS JohnS is offline
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Default Re: How much sand do I need?

Quote:
Originally Posted by Unregistered
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.
You have 400 ft² of area and the depth is 2.5/12 or 0.208 ft, so you need 83.33 ft³.

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.
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Old 06-01-2009, 10:55 AM
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Default Re: How much sand do I need?

Thank you very much. Very helpful !!!!!
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Old 07-04-2009, 04:58 PM
Krista
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Default 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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  #5  
Old 07-04-2009, 05:06 PM
Krista
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Default Re: How much sand do I need?

If each 50lb bag of sand is about .5 cubic feet then I would need about 108 bags of sand? Does that sound about right?
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  #6  
Old 07-04-2009, 05:47 PM
Krista
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Default Re: How much sand do I need?

Ok, bag the sand bag idea...how many tons of sand would I need if I went to get it in my pickup truck? (Yeah, I know it would take several trips, good thing it's just down the road!)
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  #7  
Old 07-04-2009, 10:40 PM
Dirtman Dirtman is offline
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Default Re: How much sand do I need?

Quote:
Originally Posted by Krista View Post
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!!
The following are industry averages so they will vary somewhat, dependent on moisture (and which weights of materials chart you reference).
Dry sand weighs approximately 88.9 pcf (pounds ft3), so 1.2 tons/yd3.
Damp sand weighs approximately 105.6 pcf, so 1.425 tons/yd3.
Wet sand weighs approximately 114.8 pcf, so 1.55 tons/yd3.

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 ft3
54 ft3 / 27 ft3 = 2 yd3
2 yd3 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: ∏r2, so for an 18 ft circle:

∏ x 92 = 254.47 ft2
254.47 ft2 x 0.167 ft = 42.41 ft [sup]3[/sup]
42.41 ft[sup]3[/sup] / 27 ft3 = 1.57 yd3
1.57 yd3 x 1.425 tons/yd (damp sand) = 2.24 tons

If a 50 lb bag of sand states it's 0.5 ft3, 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.

George

Last edited by Dirtman; 07-04-2009 at 10:52 PM.
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  #8  
Old 07-05-2009, 06:39 PM
Krista
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Default Re: How much sand do I need?

WOW! 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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  #9  
Old 11-25-2010, 03:43 PM
ecenur ecenur is offline
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Default Re: How much sand do I need?

Quote:
Originally Posted by Krista View Post
WOW! 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!
I am looking into doing this, just purchased a new home and my above ground pool is round, it has been a couple of months I think you have already finished up your pool project, I just have a question i want to ask, how much effort did this take? Also, were your expenses big, minor or average.
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  #10  
Old 04-19-2011, 11:33 AM
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Default Re: How much sand do I need?

i havwe an area 4800x4800x100mm how many tons of ballast do i need to cover this area, and how many 25kg bags of cement will i need to mix with the ballast at a 4-1mix?

your help would be very much appreciated
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