Concrete question

bhambulldog · Mar 29, 2019

64 skylark mike said: ↑

A 2" cap over existing slab is pretty thin. Rebar is usually imbedded a minimum of 2" from the surface, and also 2" above the base it is poured on. So it might be better to use the mesh that is #10 wire on 6'' centers each way. The sheets are easier to keep positioned in the slab than the rolls. But might have to get them delivered as they are 6' or 8' x 20'. If your existing slab has some pretty bad cracks, they will probably transfer through the cap slab. You can get a product called Fiber Mesh from your concrete supplier added to the redi-mix concrete when they deliver.
You should be able to pour it all at once, but probably should put a control joint where the apron meets the slab as it will definitely crack there with different thicknesses. A control joint will let it "crack" in a straight line at the door instead of taking off across your floor area. As mentioned above, dowel or pin the apron to the slab. Thicken the edge of the apron to take the impact of vehicles hitting it every time they go on or off of it. Install 1/2" rebar around the perimeter and 2' centers each way. With adding heating tubes and mesh to tie it to etc, along with being poured on top of another slab, I would recommend going 3".

This isn't a one man job to do in one pour, and I wouldn't try to mix it yourself. It takes way too long so you end up with a lot of cold joint problems. Plus by the time you buy portland cement, and the sand/gravel mix, you don't save much money and usually get an inferior product compared to redi-mix from your local concrete supplier. And those bags from Home Depot would cost you a fortune!
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^^^^^^^^^^^^ THIS ^^^^^^^^
good advice!!

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Concrete question

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