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Placing old slabs under new concrete slab

J

Jim54

Joined
26 Jul 2014
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Location
Sheffield
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United Kingdom
Hi,
In my garden, I've some old slabs and I'm planning on pouring a concrete slab to make a new patio. I was thinking of putting the old slabs on top of some dpm (after going over with a whacker), pouring about 50-75mm of concrete, dropping in some rebar and then putting same amount of concrete again on top? Does this sound reasonable?
Thanks,
 
Just a thought...

Will the poured concrete dry in different times on the DPM compared to the broken slabs?
If so, will this effect the new concrete structure?; possibly cause hairline cracks where the two different foundations are absorbing the water differently from the new concrete?
 

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