![]() ![]() When fear strikes consider whether the correct action might be to analyze the options and make a wise, well thought out choice rather than jumping to what seems right in the heat of the moment.ģ. Many a successful undertaking has been threatened or ruined by haste alone. Don’t just do something, stand there! We tend to admire people who are quick to action, but being deliberate, creating a plan, and pacing yourself are also actions. This can result in significant waste from hardened, unused concrete or create air pockets and compromised strength from pouring concrete that is too thick.2. Mixed concrete that must sit before being poured into place can partially or even fully set. Allow plenty of time to dig all the post holes for the project before the concrete is delivered or mixed. This will save you from a bad pour (concrete installed in parts resulting in a separated, weak mass) in the event that your estimates are even slightly off.įinally, digging can be hard, time-consuming work. The amount of overage you plan for will vary based on your quantity, but plan for at least 10% overage to accommodate spillage, settling, and grading inconsistencies. Order extra concrete (overage) for your project. Discuss these issues with your concrete supplier ahead of time so that you have a clear understanding of costs and can plan accordingly. Your concrete supplier can advise you on the proper mix to use for your project and region.įor ready-mix concrete delivery, there are typically additional fees for delivery, weekend service, small loads, and overtime for long unloading times. Colder temperatures need longer curing times sandy soils need different shaped holes more extreme freeze/thaw cycles need higher strength concrete than more temperate regions. This depends on the application and the climate where you live. Type of Concrete and its Proper Installation The following table shows the approximate yield of mixed concrete for common bag weights.Īpproximate yield for various bags of concrete Bag Concrete WeightĬonsider these tips to ensure your concrete installation goes smoothly. Note that 4″ posts are actually 3 ½ in diameter. Let’s assume you’re installing a 6-foot high fence, where 2 feet of the post will be in the ground, and you will need twenty (20) 4″ nominal round posts. Let’s use an example to illustrate what we covered above. If you have multiple different size post holes to fill, calculate each set with matching dimensions separately, then add the totals together. Don’t forget to add in some extra for spillage and waste. Simply multiply that amount times the number of posts to get a total quantity. With the volume of the submerged post and the volume of the hole figured out, subtract the post volume from the hole volume, and you will have the volume of concrete needed for each hole. Volume = radius 2 × π × depth (π = 3.14) Calculate Concrete Volume Use these formulas to calculate volume or, for round holes, use our cylinder cubic yardage calculator. Use our calculators to quickly convert inches, yards, or meters to feet. To easily use the table above, convert your units to feet if they aren’t already. Then calculate the volume for the part of the post that will be submerged in the hole. Your post diameter and height determine how big each hole needs to be.Īs stated above, fence post holes should be three times the diameter of your post and 1⁄ 3 as deep as your post.įirst, you need to calculate the volume for the post hole. To calculate how much concrete you need, you need to know the post size you are going to use and how many posts you are installing. How Much Concrete Do You Need Per Fence Post?Ĭoncrete is sold pre-made (and usually delivered) by the cubic yard or in pre-mixed bags by weight. ![]() ![]() Illustration showing a post hole with a diameter that is three times the post’s diameter and with a depth that is 1/3 the height of the post.
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