Make sure you have enough concrete to fill the entire area to the depth you desire.
Pouring concrete over existing concrete sidewalk.
Pouring concrete over an existing concrete driveway or sidewalk.
By the same token if you attempt to clean the surface and the concrete just keeps breaking apart into bits of sand and gravel replacement is your best option.
The condition of the existing slab is the primary factor that determines how long the new concrete will last.
Add all of the concrete right away so none of the mixture has a chance to dry out.
If the slab runs up to a door the raised surface may not provide the necessary clearance for the door to open.
Disadvantages of pouring new concrete over existing concrete.
Pouring a new layer of concrete over an existing walkway patio or porch will raise the level by several inches.
If the concrete has multiple deep cracks extending all the way through its depth pouring concrete over existing sidewalk driveway or patio surfaces generally is a waste of time.
Pour concrete onto the existing slab until it is around where you want the final level to be.
Hi there pouring a new sidewalk over an existing one is a problem waiting to be solved in a future edition of breaktime using concrete chunks as fill would also qualify for this honour sometimes the easy route works but most of the time it doesn t.
The same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk.
You can if the concrete is sound solid with minor cracks pitting scaling surface damage or just plain ugly.
Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan.
Apply the new concrete over the primer.
In addition to the concrete walkway cost suppliers usually add a short load charge for small orders generally under 3 yds.