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Tool Talk Discussion Forum

Calculate Cost of Rock

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Joe MD

01-25-2006 13:11:39




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How can I calculate how much rock I need? I have seen it quoted by the ton and the yard?

I have found this formula for cubic yard, but don't understand why it works. length*width*depthInches/324

Are there other ways to calculate?
How much does crusher run cost in your area?




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jeffcat

01-26-2006 15:50:59




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
It always blows my mind how many neat things you can learn on this site! On the farm my dad would drive up to the local cement plant to buy gravel and sand. Always weigh the truck before and after load. That way there is NO way to mess around! A ton of sand is a He--ll of a lot of weight on one of todays toy pickmeup trucks. Be careful or you will need a lot more work than you will want. A 3/4 ton truck also means you and the gas in the tank! Got to love this web site! Jeffcat

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JMS/MN

01-26-2006 08:34:58




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
In the gravel pit where I worked we graded all crushed material through a wash plant, so the customers could get washed sand, pea rock, 5/8 inch, 3/4 inch, 1 1/2 inch. 3/4 inch was typically used on driveways. A yard was considered to be 2800 lbs., and the loader was equiped with an electronic scale.



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Leland

01-25-2006 21:30:30




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
just a hint to keep your rock from walking into yard cut 4-6" of soil out of where your drive is going this will keep rock in it's place and put down a geo textile barrier this will keep rock from sinking into the ground also .



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Dave NE IA

01-25-2006 21:16:28




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
I'm not sure if this is what you need. 320 divided by inches (1 inch deep) deep will give you how many square feet a cy will cover. 320 divided by 4 inches deep = coverage of 80 square ft. or backwards if you have a area in feet length times width then divide by 320 thus 4 inch deep=80sq ft per cy @ 4inches deep---54 @ 6inches deep----40 @ 8inches deep. This is how you figure concrete also. The conversion per ton is very dependant on the type of rock as well as how many fines are included etc. as others have stated. In our are a tandem axle truck with out cheaters with NE Iowa's limestone crushed 3/4 inch with fines is usually 14 ton for ball park ideas. Hope this helps rather than confuse you. Dave NE IA

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Charles (in GA)

01-25-2006 17:30:31




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
Here in JawJa we have granite for rock, instead of limestone. I despise crush n run. The large stuff, #2 or whatever it is, is so large that when you roll over it with your tires, it goes shooting out the side into the grass in the yard. End result is dinged mower blades and a yard full of rocks and nothing on the drive. I will not do that again. Previously I had used 57 stone, a mix of #5 and #7 rocks, and it worked well, stays in place and packs in.

Charles

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Joe MD

01-25-2006 14:52:13




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
Thanks for the input. I get the math now thanks. Crusher run is a combo of smaller stone smaller than #2 and limestone or some sort of dust that is real good for driveways because it compacts almost like cement. I believe it is a byproduct of other quarrying operations.

Couple more questions.

Anyway, the issue is that I have always gotten stone by the yard or two just dumped into the back of my pickup. If it really weighs 1.6 tons a yard how could I have had 6500 pounds in the back of my f250. Doesn't sound right.

The other thing that I don't get is the sale by weight of rock. This stuff has a lot of finings in it and when it gets rained on it gets extremely heavy? So do I buy in a drought?

These must sound like real stupid questions.

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720Deere

01-25-2006 18:07:06




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 14:52:13  
Joe,

I assume by your handle that you are located in Maryland? If so, what part? If I know where you are, I can give the unit weight of different grades of stone from your local quarry. Buying stone by the cubic yard is the easiest way to get ripped off. Most peddlers seem to believe that their skidsteer or backhoe has at least a 2 cy bucket. Crusher Run (dust to 1") weighs anywhere from 1.4 to 2.1 tons/cy in MD. The average is usually close to 2 tn/cy unless the rock is of poor quality.

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Joe MD

01-26-2006 07:04:03




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 Re: Calculate Cost of Rock in reply to 720Deere, 01-25-2006 18:07:06  
Yes, I am north of Westminster. We have graduated from the occasional scoop in the pickup to fill small holes to needing at least 3 dump truck loads so I am trying to figure out how to not get ripped off and if we can afford it.

One section of the driveway has become a sloppy mess.



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720Deere

01-26-2006 08:40:35




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-26-2006 07:04:03  
Lafarge's Medford quarry is going to be the closest source thus creating the cheapest haul rate. Their stone is okay, but for an exposed driveway you might want to spend the extra money and get your crusher run from their Texas quarry in Timonium. It's likely to cost you $80 per load more because of the long haul, but the Texas limestone will stay in place better than any other stone in this state. If you mix a little calcium chloride with it when you put it down it will set up like concrete!

Either Texas or Medford Crusher Run #6 will be between 140 & 150 lbs per cubic foot or approximately 2 tons per cubic yard. Those numbers are at maximum density so your yield may be a little better (around 1.8 to 1.9 tn/cy).

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Joe MD

01-26-2006 10:26:50




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 Re: Calculate Cost of Rock in reply to 720Deere, 01-26-2006 08:40:35  
I was told about Lafarge.

Thank you sir, you know your rock.



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John in Md.

01-28-2006 03:10:52




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-26-2006 10:26:50  
If your driveway isn't to bad, why don't you wait til summer and find a crew milling blacktop on a local road. Call their office and tell them you have a place to spread a few loads, they save on trucking and you save on material (If you talk to the foreman you usually get ripped off). If you do it in warm weather millings will pack together and last for years. Make sure you have somebody around to show them where to spread it or you'll have 20 ton blacktop piles that can be tough to deal with (Truck drivers have an odd sense of humor).

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Heat Houser

01-25-2006 14:18:23




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
How your formula works:
You are using length and width in feet, height in inches.
A cubic yard is 3 ft (length) by 3ft (width) by 36 inches (height) using your terms.
3X3X36=324.
This is how the "factor" is arrived at by mixing feet and inches in a cubic yard calculation.



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caculation

01-25-2006 14:00:29




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
length x width x depth = cubic feet

cubic feet divided by 27 = cubic yards

27 = # of cubic feet in 1 cubic yard

What are you refering to when you say "crusher run"? I believe that you might mean "Fines" that or stone dust which is a final by-product of the stone crushing process.As for the caculating cubic yards into tons this is hard to with out knowing the material size and density.One cubic yard can equal 1.5 to 2.5 tons depending on the material.The producer of the stone can probably give you the proper ratio.

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Butch(OH)

01-25-2006 13:36:22




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 Re: Calculate Cost of Rock in reply to Joe MD, 01-25-2006 13:11:39  
Different rock and different gradations of the same rock weigh different but generally speaking if your talking about a dense graded material like crusher run 1.6 tons per cubic yard will get you close. There are many ways to do the figuring but I like to get all the dimensions to yards then it is simply width X depth X length = cubic yards X 1.6 = tons.
To convert inch measurements to yards divide by 36
To convert feet measurements divide by three.

Around here dense graded crushed limestone is about $8 per ton F.O.B. the plant. Delivery charges varys a lot

It is not legal here to sell by the yard.

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