WEBVTT 00:00.000 --> 00:06.000 Various items require different units of measure based on how the material is going to be purchased or how it's installed. 00:06.000 --> 00:15.000 You will find as we go through this that the same object requires different units of measure for purchasing versus actually performing the labor itself. 00:15.000 --> 00:22.000 Here we're looking at concrete. This is a footing and we're going to identify how the calculations that you use for a cubic yard. 00:22.000 --> 00:26.000 So you have a length, you have a width, and you have a depth. 00:26.000 --> 00:29.000 That's required to come up with a total cubic yardage. 00:29.000 --> 00:35.000 So let's look at this diagram. We're going to identify the length times the width times the depth gives you volume. 00:35.000 --> 00:39.000 In this particular case, it's going to give you cubic feet. 00:39.000 --> 00:44.000 Except the estimate is going to be looking to price things out based on the cubic yard. 00:44.000 --> 00:51.000 Let's work with the length of four feet times the width of four feet times the depth of three feet. 00:51.000 --> 00:54.000 It gives us a total of 48 cubic feet. 00:54.000 --> 01:00.000 Now, since we're looking for cubic yards, which is how labor and material are priced out, 01:00.000 --> 01:06.000 we will then take that 48 cubic feet and divide it by 27 cubic feet equals a cubic yard. 01:06.000 --> 01:11.000 That gives you a total of 1.78 cubic yards per footing. 01:11.000 --> 01:14.000 But we're not done there. That's for a single footing. 01:14.000 --> 01:25.000 Throughout the rest of the project, you notice this 12 of them, which is a total of 21.33 cubic yards when you multiply it by 12 footings altogether for the project. 01:25.000 --> 01:30.000 This is a very basic, very simple math. It's geometry that you need to understand. 01:30.000 --> 01:35.000 But note that according to that image, you must have your length, your width, and your height. 01:35.000 --> 01:42.000 But also, where does it go from there? We don't want to work with cubic feet because all of those measurements were in feet and inches. 01:42.000 --> 01:51.000 We do want to convert it to yards. So now you know that you have to purchase a little over 21 cubic yards of concrete and also the labor to perform that. 01:51.000 --> 01:56.000 So you might be wondering, how do you know what unit of measure to use for a concrete footing? 01:56.000 --> 02:02.000 So by looking at some of the supply houses and inquiring as to how the materials are being sold, 02:02.000 --> 02:07.000 that will tell you exactly what the unit of measure is or needs to be on your own takeoff. 02:07.000 --> 02:13.000 As far as the labor goes, and if you're uncertain about how it's priced out, check with your subcontractors. 02:13.000 --> 02:17.000 They'll tell you right away that they price out their concrete footings by the cubic yard. 02:17.000 --> 02:24.000 You have to know the correct units of measure prior to your takeoff. It's a requirement so that you know how to measure them. 02:24.000 --> 02:30.000 Here we have an example of slab on grade. It too has a length and it has a width, and it also has a depth. 02:30.000 --> 02:36.000 So we can come up with cubic yards of material, but the labor itself is priced out per square foot. 02:36.000 --> 02:40.000 And typically it's a crew that does the installation of this. 02:40.000 --> 02:46.000 So you might have multiple people involved with providing even just one square foot of slab on grade. 02:46.000 --> 02:52.000 Slab on grade is typically going to be anywhere from four inches, perhaps two, total of eight or more inches. 02:52.000 --> 02:57.000 So in this particular case, you can see that you have a length of 24 feet on the slab on grade. 02:57.000 --> 03:05.000 Then you have a width of 12 feet. So the slab on grade itself is 288 square feet times 0.667. 03:05.000 --> 03:12.000 That's the decimal equivalent to eight inches. We're going to spend a little more time talking about those equivalent shortly. 03:12.000 --> 03:18.000 That equals a total of 192 cubic feet or 7.11 cubic yards of concrete. 03:18.000 --> 03:28.000 So your material is going to be 7.11 cubic yards, but your labor is going to be 288 square feet of slab on grade.