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Discussion Starter #1 (Edited)
I have a 14 x 14 wood single slope patio cover that I would like replaced with a hip roof. I have an issue with the patio. If you walk out my back door you step onto a 3 x 3 slab connected to the house. Then the remain 11 feet down on each side is pavestones. There is however more concrete slab to the left and right of the pavestones to make the square patio. My question is can I pour a concrete slab on top of the pre-existing slabs if I remove the pavestones to make a solid 14 x 14 slab. I have 5 inches height to the door edge.
 

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I have a 14 x 14 wood single slope patio cover that I would like replaced with a hip roof. I have an issue with the patio. If you walk out my back door you step onto a 3 x 3 slab connected to the house. Then the remain 11 feet down on each side is pavestones. There is however more concrete slab to the left and right of the pavestones to make the square patio. My question is can I pour a concrete slab on top of the pre-existing slabs if I remove the pavestones to make a solid 14 x 14 slab. I have 5 inches height to the door edge.
If you have any frost movement the new 'coat' will likely crack along the edges of where the old concrete is.
To work around the old concrete, it will probably cost as much, as if the old concrete is removed and everything totally replaced.
 

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What if I poured 5 inches of concrete on top , used rebar attached to old slab and adhesive. I have several bids that say this would be more cost effecient than demo and pour new. I want this to last long term.
 

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What if I poured 5 inches of concrete on top , used rebar attached to old slab and adhesive. I have several bids that say this would be more cost effecient than demo and pour new. I want this to last long term.
I want this to last long term.

Then get rid of the old slab then, and pour the whole thing as a unit.
Anything else is speculative.
 
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