I am total beginner, so please bear with me.
I live in a second floor condo unit (built around 1997). I recently removed a closet and discovered that my carpet rests on some sort of underlayment, which rests on some sort of concrete float, which rests on plywood. The concrete measures just under 1 inch. Here are some images:
You can see in the first picture that the left side was cracked while removing the closet.
Here are some close up pictures of the concrete:
Additionally I have tile in my kitchen and bathroom that both also appear to rest on this concrete float. Here are my questions:
Is this concrete called a float? I found this StackExchange thread, stating that this a float.
How do I reinstall and/or fix the cracks I've created in the float? In the referenced StackExchange thread above, one answer states to use mortar mix, another states that I should use sakrete, and the third states I should use concrete pre-mix to re apply the float. Potentially using a "dry pack" method.
I would like to replace the the carpet and tile with vinyl plank flooring. Is working with this float the best option? I would assume that if I do work with the float I would need to add and level float and install some sort of underlay, although I'm worried about cracking the concrete while removing the tile.
Thanks in advance for any help you can provide.