Posted: 8/7/2014 1:59:56 PM EDT
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Ok, thinking about pouring a slab of concrete off the back porch for a landing. Rough dimensions are 52"x30", and around 4" thick, since it will have a good gravel base anyways. Planning on using some quickcrete. They have a calculator on their site, for a 4" thick slab, or a 6" but you need to know the square feet of the area to be covered before you can get a estimate of how many bags you need.
So basically i need to know the square feet of a rectangle 52"x30". Yes I know, simple math, and you'd never believe I completed the building construction course in HS either  
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http://www.lowes.com/cd_Concrete+Pad+Calculator_100901113_
Sorry...just saw your dimensions are inches, not feet. |
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Quoted:
But they are sold in pound bags.
Quoted:
Quoted:
3.6 cubic feet of concrete is what you'll need. But they are sold in pound bags.
And each 80 lbs of ready mix is equivalent to .6 cu. ft. So the OP will need 3.6 cu ft (actually 3.6111111, but let's not confuse the poor OP), then he'll need 3.6/.6 = 6 bags of 80 lb ready mix concrete bags. But, my bet: you already knew this!
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A local lumber/hardware store has a fancy chart for how many bags of concrete you would need for a job, and it had it broken down into 60 lb bags and 80 lb bags.
All sizes were 4" thick. I remember the 10' x 10' pad needed like 66 bags (don't remember what lb bag though). just useless knowledge at the time. |