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Hi everyone,

I am writing for some advice about sealing the hatch that leads into my basement. The hatch covers the stairs to the basement. These stairs lead to a small vestibule that has a door that opens into my basement and is right below my small stoop (I have more of a tenement building than a brownstone). I noticed yesterday that the concrete ceiling (which is also the bottom of the stoop) looks like it is about to fall down, because of water damage and dampness.
Here are my questions:
1. What should I use to caulk the hatch so that water doesn’t seep through?
2. What kind of concrete do I use to redo the concrete on the walls and ceiling in the vestibule?
3. Does anyone have any creative ideas about venting given that I have a hatch and given that the stoop is so small that there isn’t room for venting from there?
4. Can I do this or should I hire someone? How much would something like this cost

Many thanks?