Concreate over slabs

[bigolbear]

Hi I have a 5 foot covered passageway between my house and so called out buildings , so brick work one side existing concrete slab the other which is at the highest point is a 5 inch step-down to 1 inch so I want to take the slope from the front back to to the back back door and level it up with the existing slab . The current floor is slabs 3x2 with a foot edge of cement . to the house wall .

how much of this do I Have to rip up , befor I can concert it over, calculator says I need .75 Mtr . do I need a joint between the existing concreat, or dowel bars or mesh the weight it will take is people and the occasional barrow i'm well below the house DPC

 

[noseall]

The greatest fear when adding layers of concrete is trapping moisture between layers and it subsequently freezing in poor weather. It is sometimes better to put a hammer through the slabs and break 'em up.

I would say 75mm thick concrete is about as thin as you should go.

 

[bigolbear]

The greatest fear when adding layers of concrete is trapping moisture between layers and it subsequently freezing in poor weather. It is sometimes better to put a hammer through the slabs and break 'em up.

I would say 75mm thick concrete is about as thin as you should go.

Sorry to be a pain , as it's damp enough out there would it be better if i lifted the slabs and put a DPC under the concrete I do know there is hard core under them ?

 

[noseall]

No need for dpm.

Damp is not an issue more to with water being trapped between impervious layers, though temp's have to be really low for it to be a problem in this country.

 

[bigolbear]

Thanks so no re bar or suchlike , I should know all this 25 yeas ago i was contracts manager for RPC mind never pored a spade full of the stuff but good with bar marks LOL , Is it ok just to poor up the existing slab