Cement foundation for shed

I plan to build a 10'x12' shed in my yard. I have this patio area made up of 7-8 rectangular slabs of cement, all with different surface and each slightly tilted so that I have this uneven patchy surface.
What I want to do is erect a shed over a large portion of this patio and I am trying to decide if a cement or wood floor is best for the floor. OK, wood is easy, I just need to make some footings. My question centers around the cement pour.
Do I need to remove all that ugly patio cement and start with a new slab poured onto compacted earth or can I (and this is the real question) pour a new slab on top of the old cement. I suppose I would need a comcrete bonding agent and either rebar or a metal fabric to reinforce but is building up like this a recipe for cracks or other problems. The old patio is probably 30years old and is unlikly to settle much more. What minimum thickness should I use?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Probably be helpful to know what climate you live in. I can't advise you on concrete part but in many locals now, you need a permit to put up even a small storage shed as you mention plus in our area, they tax you if it is on a concrete slab (permanent building) but not if is on runners - wood floor - thus considered temp. movable building.
Walt Conner

around
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
What you are talking about is concrete, not cement. Cement is a component of concrete.
Your plan is a recipe for disaster. You need footings. The concrete slabs you are talking about are not footings. Hire a professional to help you do this project right.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.