how many bags of ready-mix concrete would

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how many bags of ready-mix concrete would

Postby tommy » Tue Jul 15, 2008 4:29 pm

how many bags of ready-mix concrete would cover 2.5 cubic feet at 5 inches deep
tommy
 

Re: how many bags of ready-mix concrete would

Postby Dirtman » Wed Jul 16, 2008 3:42 am

tommy wrote:how many bags of ready-mix concrete would cover 2.5 cubic feet at 5 inches deep


Using Quikrete (available at most building supply stores), each:
80# bag yields approximately 0.60 ft^3 (cubic feet),
60# bag yields approximately 0.45 ft^3,
40# bag yields approximately 0.30 ft^3.

Simply multiply the ft^3 (cubic feet) needed * the yield (listed above), according to the bag size you want or is available.

2.45' * 2.45' * 5" = 2.5 ft^3. Using 80# bags, 2.5 ft^3 * 0.60 ft^3 = 15 bags. As the yields are approximate, I would get 1 bag extra, just in case.
Dirtman
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Re: how many bags of ready-mix concrete would

Postby Guest » Wed Jul 16, 2008 5:30 pm

Dirtman wrote:
tommy wrote:how many bags of ready-mix concrete would cover 2.5 cubic feet at 5 inches deep


Using Quikrete (available at most building supply stores), each:
80# bag yields approximately 0.60 ft^3 (cubic feet),
60# bag yields approximately 0.45 ft^3,
40# bag yields approximately 0.30 ft^3.

Simply multiply the ft^3 (cubic feet) needed * the yield (listed above), according to the bag size you want or is available.

2.45' * 2.45' * 5" = 2.5 ft^3. Using 80# bags, 2.5 ft^3 * 0.60 ft^3 = 15 bags. As the yields are approximate, I would get 1 bag extra, just in case.


Dirtman,

Check your math. I think something went south there. If you need to fill 2.5 ft³, and the bags are 0.6 ft³/bag, you need just over 4 bags, and should round up to 5. You need to divide, not multiply.
Guest
 

Postby Dirtman » Fri Jul 18, 2008 9:38 am

Way south. It's cold here in Antarctica!

You're absolutely right, you divide . . . not multiply. Thanks for the catch and the correction.
Dirtman
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Postby Guest 2 » Tue Jul 29, 2008 10:46 am

How does someone cover 2.5 cubit feet. I assume you mean square feet. I don't have a calculator with me, but 2.5 square feet 5 inches thick is about 1.1 cubit feet. I'm calling it 2 bags.
Guest 2
 

Postby Dirtman » Wed Jul 30, 2008 11:06 am

Guest 2 wrote:How does someone cover 2.5 cubit feet. I assume you mean square feet. I don't have a calculator with me, but 2.5 square feet 5 inches thick is about 1.1 cubit feet. I'm calling it 2 bags.


It's 6.0025 square feet (2.45' * 2.45').
5" = 5"/12; = 0.41667'

2.45 * 2.45 * 0.41667 = 2.501042 ft^3 (cubic feet), so; 2.5 ft^3 / 0.6 ft^3 per bag = 4.17 bags, rounded up to 5 bags.

George
(Back from the Antarctica)
Dirtman
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Posts: 574
Joined: Sat Jan 21, 2006 2:04 pm
Location: California


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