The time has come to do the cost estimating for the slabs of our project, which means that we need to calculate both the concrete and the rebar that will be used. Before we figured out the rebar, we had to consult with the site plan group to get the most up to date plan for the slab, and then calculate the cubic yards that the slab would equate to. To do this, we came up with the area of the slab in inches, and multiplied this number by 6 since our slab would be 6 inches deep.
Next, we had to calculate the volume of the turndowns that would be placed where ever structural members would be interacting with the slab. These are needed to give the slab extra resistance to compression or tension that are attributed to the structure connections.
Voila, after doing this, we added the two numbers together to determine the total cubic inches of concrete needed. We plugged this number into an online convertor to get the final number needed, cubic yards of concrete (who decided to measure it in cubic yards instead of cubic feet?). Our answer: 30.9 yards cubed. When coupled with the price estimate we got of $150 per cubic yard, we found that our slab would cost $4,635 before tax and shipping.
After this number crunching, I moved on to the task of creating a rebar grid plan, which has been tougher than anticipated, the internet has not supplied me with great information so I had to access a piece of the past, the library. Below is my first attempt at the rebar grid:
– John