You need to start with a clean surface and ensure a proper bond to create a new concrete surface that lasts.
Pouring concrete floor over existing.
Pouring concrete over an existing concrete driveway or sidewalk.
The condition of the existing slab is the primary factor that determines how long the new concrete will last.
You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly.
Apply the new concrete over the primer.
A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years.
Pouring concrete over an existing concrete slab how to bond them together they always say rome was not built in one day and this was the place that changed the looks of architectural structures that we see today.
This includes removing sand dead leaves and gravel.
Sweeping dirt s debris over the existing concrete slab will allow bonding to take place.
Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.
Pouring concrete over existing concrete sidewalk or patio surfaces is an option if the existing base is structurally sound.
Make sure you have enough concrete to fill the entire area to the depth you desire.
They will consider the existing slab structurally sound and just pour the new slab as if they were pouring over a gravel base.
Add all of the concrete right away so none of the mixture has a chance to dry out.
However most contractor will simply come out and place a rebar mesh on small pedestals above the existing floor and then pour enough concrete to level the area and cover the rebar mesh.
When we pour concrete floors over existing concrete floors and the new floor is less than 3 inches thick we use a product called weld crete to bond the two floors together.
Steps involved in pouring concrete over existing concrete slab step 1.
One of the best tools that can be clean all the debris out of crack is a stiff bristle broom.
Cleaning old concrete surface.
The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk.