You don't. You break it down with a Sledgehammer, Remove mostly all of it that you can, and Pour Concrete to create 6 foot Slabs between 4×4×48s.
A photo would help. How bad is it? Is it cracked? If it's just spalling, flaking, and level it can be resurfaced. If it's out of level, severely cracked, separating it would need to be removed and a new one poured.
To William’s point,
Sometimes they fall apart from water intrusion and the spalling is fatal, through efflorescence.
A picture would be great.
Get concreat patch and repair in a bucket all mixed you just could go over what’s there build a frame with 2 x4 s
We seem to have some unwelcome Mickeys and Minnies in our house. What is the best way to get rid of them?
I want to remove my popcorn ceiling, but it has asbestos in it. How do I go about this safely?
How do I fill gaps at baseboard, should I caulk? If so, does anyone know how to caulk baseboards?
How do I fix squeaky hardwood floors?
You don't. You break it down with a Sledgehammer, Remove mostly all of it that you can, and Pour Concrete to create 6 foot Slabs between 4×4×48s.
A photo would help. How bad is it? Is it cracked? If it's just spalling, flaking, and level it can be resurfaced. If it's out of level, severely cracked, separating it would need to be removed and a new one poured.
To William’s point,
Sometimes they fall apart from water intrusion and the spalling is fatal, through efflorescence.
A picture would be great.
Get concreat patch and repair in a bucket all mixed you just could go over what’s there build a frame with 2 x4 s