calling all concrete experts

[ktm010]

I will be pouring a monolithic slab in about a week looking for recomendations on saw cutting slab. size is 30 x 40 right side of garage will be poured flat left side between two overheads have a slight pitch to 40" trench drain. I don't know if this layout is best?

 

[jake1086]

<<< NOT AN EXPERT<<<< I'm doing something very similar and also not sure about the grading to the drain... not sure if I actually need a slope as much as an absolute flat plane and I'll use a squeegee to get the water to the drain if it doesnt evaporate from the floor heat...

Also mine will be 40X100 with 80 of the 100 being shop

 

[dcs Inc]

I will be pouring a monolithic slab in about a week looking for recomendations on saw cutting slab. size is 30 x 40 right side of garage will be poured flat left side between two overheads have a slight pitch to 40" trench drain. I don't know if this layout is best?

You need better crack control. The layout will look good but offer little in crack control. Here's what you need.

These can be saw cut into the slab as soon as you can walk on it after finishing. You don't want to wait. Concrete developes cracks during early hydration due to shrinking. They will crack from the bottom up and not show their ugly heads on the surface till later. An early entry saw can be used and scored as soon as allowed. These saws wont chip the surface during cutting. A regular saw blade will chip the edges. See if your local tool rental company offers them.

 

[ConCretin]

dcs Inc has it right. You typically want the panels created by the saw cuts to be as square as possible.

The trench drain presents a potential problem. The reentrant corners it creates could induce a crack that your proposed layout would address. I'd thicken the slab a bit under the drain to avoid an 'opening' all the way through the slab.

I'd also just add that the depth of cut should be 1/4 of the slab thickness.