How do i measure how much concrete i need for a garden path please?
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Gday Mate. Landscaper. Work with concrete every day. What you need to do it work out length x width x depth. This will give you a cubic measurement of required concrete. If mixing yourself make shore you do not make the cement too wet or will weaken it. When laying the cement it is best to put it in on a crushed rock base. This will allow for any movement under the concrete and will expand and contract in the heat and the cold and the wet and dry thus protecting the concrete.
width x thickness x length
I would suggest using inches for all of the measurements. Once you have found width x thickness x length, you will have the volume in cubic inches.
If you are using premixed bags:
80# bag has 1152 cubic inches
50# bag has 864 cubic inches
(Volume in in^3)/1152 will give you the number of 80# bags you need.
If you are having it brought by truck:
1 cubic yard has 46,656 cubic inches
(Volume in in^3)/46,656 will give you the number of cubic yards you need.
You need to determine the volume of concrete per linear foot of garden path. Then divide by 27 (cu-ft per cu-yard) to get the total number of yards of concrete.
For example, a path 36" wide (3 ft) by 4 inches deep requires 1 cubic foot of concrete for each 1 foot of length. A path that is 13-1/2 ft long requires 1/2 cubic yard. A 27 ft long path requires 1 full cubic yard. Etc.
If you are using bags of quick-mix concrete, figure each 80 lb bag can provide 2/3 of a cubic-foot of concrete. Therefore, 40-1/2 bags are equal to 1 cubic yard.
Really easy! Find the square footage of your pathway (length x width) and divide by 80. This is how many yards you will need at 4" thick walkway. This way is quick and easy, without the additional math. This is how we did it in the field since calculators are not readily available.
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