When ordering Concrete, is there a formula to find how many yards to get when you know the ft^2 & thickness?
Question:I'm looking for a formula that you can plug in the thickness of the slab (say 4inches or 6 inches) and the square footage of the slab, and come up with the amount of yards to order from the concrete company.
Answers:
Yes: Multiply the square footage involved by the thickness (also stated in feet). Divide the product by 27 (the number of cubic feet in a cubic yard), and the result is the number of yards required.
Examples:
100 square feet times .5 feet (or 6 inches)=50 cubic feet. 50 divided by 27 is 2 (roughly) cubic yards.
90 square feet times 2 feet = 180 cubic feet. 180 divided by 27 is 6.75 (roughly) cubic yards.
Doublecheck your arithmetic with your contractor or construction supply store *before* you buy or mix your concrete!
Actually the Concrete company will do this for you. Just tell them the dimensions and they will tell you how much to order.
divide by 27.
cubic feet / 27 = cubic yard, which is what you order.
Always order a little more though as just a 1/2" thickness can be a big difference in yards, if you have a large area obviously.
There are 27 cubic feet in one cubic yard. (3' x 3' x 3'). One square foot at a depth of 4" would account for 1/3 of a cubic foot. If you do 99 square feet at that depth, you would need 33 cubic feet - which is just over one cubic meter.
width x length x .5 for 6" divided by 27 = cubic yards
width x length x .33 for 4" divided by 27 = cubic yards
divide the thickness by 12 to get that fraction above.
Not allowing for footings, the deep grooves cut into the ground to hold a slab in place, you would take the length times the width and divide it by 80 for a 4 inch slab. This will give you the correct cubic yardage. Be aware, however, that Redimixed cement, delivered in a truck, has to be ordered by the yard and there are usually minimum amounts that can be ordered (generally three yards). The cost they quote you will not include any admixes (such as hardeners like tricyne) and will not account for changes in mixture if you need a certain "slump" configuration. The slump is measured by inches and is figured by pouring cement into a cone, removing it, and then calculating how many inches it falls in a designated period of time.
Hope I helped you.
yea it's called MULTIPLICATION !
length times width times height
http://www.servicemagic.com/resources.ca...
try this
yes there is a formula a cubic yard is 3 ft by 3 ft by 3ft or 27 square ft one ft thick or 54 square ft at 6 inches thick or 81 square ft at 4 inches thick most concrete companies have slide rulers you can get to figure various thickness and footage to measure yardage needed hope this helps
More Related Questions & Answers...