Multiply figures for length, width and thickness, measured in feet, and divide by 27 to determine the yardage of concrete required. Multiply the total yards by 1.05 to allow for a margin of error to ensure enough materials are available. With a pocket calculator and tape measure, the process takes only a few minutes.
Know MoreUse a tape measure to determine the size of the project. Enlist a helper to hold one end of the tape. Record the measurements in feet. Convert any inches over the full foot measure to a fraction of a foot by dividing the remaining inches by 12. Measure and record the dimensions of any areas that lie outside the larger rectangle in a similar method.
Convert the thickness of the concrete to a fraction of a foot. Calculate the volume by multiplying length by width by depth. Add any additional volumes from out of the main rectangle.
The volume figured using measurements in feet provides the number of cubic feet. Divide the volume by 27, the number of cubic feet in 1 cubic yard.
Multiply 1.05 by the number of cubic yards provided for over-excavation, spills and unforeseen events. Many concrete companies have a minimum load size or an additional charge for small loads, making it less expensive to have a small amount of materials left over than to have to order more concrete.
According to Family Handyman, you make concrete forms for sidewalks by lining the length of the planned sidewalk with 1 1/2-inch boards along the straight areas of the sidewalk, and flexible hardwood siding along curved portions. To prevent the forms from bulging under the weight of the concrete when it's poured, place stakes at regular intervals along the form's length to provide outside support.
Full Answer >According to the Lester Carpet Company, running feet of carpet is calculated by selecting which direction the carpet will be unrolled during installation and measuring how many rolls will fit into a room in that direction. The length of the room in the direction of the unrolling is called the "run," which can be measured in feet.
Full Answer >An 80-pound bag of concrete yields 0.60 cubic feet of wet concrete when mixed with the proper amount of water. Concrete consists of portland cement, sand, stone, gravel and additives that make the substance cure when it dries. An 80-pound bag needs about 6 pints of water to mix properly.
Full Answer >It requires two 80-pound bags of standard concrete mix for a 4- to 6-inch-thick concrete slab that is 2.0801 square feet, which is equal to 3 cubic feet. So, two 90-pound bags of concrete should get the job done.
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