Hi all...let me give you a quick rundown of what I am working with and planning on doing. Our house is 100 years old...there is about a 12x6 section of the basement that used to just dirt floor...I believe it was the old coal room. My in-laws were the previous owners the house and used it as a rental. My FIL just poured some concrete on top the dirt floor..maybe 2in thick...just to make it a usable space. Well now I am planning on putting a small workshop in the area so I want to take out the old concrete and do it properly. I have done patios before, but nothing indoors, so I am wondering what I should do around the perimeter where the concrete will be meeting the basement walls and edge of the existing concrete. I am planning on putting down a vapor barrier as well as a gravel base. I am just not sure how to handle the perimeter of the new section. Since it is a basement, will just basic concrete mix be sufficient, or do I need something different? Given the size of the space, should I groove it and use mesh/rebar? Any tips or suggestions are appreciated. Thanks in advance!