Quandaries
and Queries 

My name is Armand, I am not a student nor a teacher but a retired renovator and I'm embarrassed to have to ask this question. I am planning to pour a concrete slab over an existing slab in my garage which is very uneven, with a depth variation from 2 1/2 inches to 5 1/2 inches from level. I'm afraid to over estimate concrete since it will be wasted but worse, I'm afraid to underestimate. I've broken the slab down into four sections with the following being the four dimensions, can you tell me how much concrete I will need please, I would very much appreciate your help. 1 6ft/8in x 20ft x 4 1/2 in. thick 2 16ft/10in. x 20ft x 3 1/2 in. thick 3 6ft/6in. x 16in. x 5 1/2 in. thick 4 6ft/6in. x 8ft. x 4in. thick Very best regards, 

Hi Armand, Since you want the volume of concrete in cubic yards I would first change all the dimensions to yards. For example in the first slab
Thus the volume of the first slab is
I did a similar calculation for the other three slabs to get a total of
You should check my calculations. Penny 

