More than likely you will need a 18'' slab in NY, a 4'' is more like for patios, not for foundations for building structures. Also given the weather in that area you are going to need something that is going to stand up to the cold and snow.

I personally would start by having some people come out and quote me for a new foundation, because you ain't going to do that yourself, it's too much concrete, and then you will get some professional ideas of options you have.

Move lol

At least based on the responses.

You can cut a peice to fill the space and glue it to the sub floor.

Yes you can.

But I also look at it this way, do I have enough paint for a second coat? Because I'd rather just paint the room again rather than worry about how to dispose of leftover paint LOL.

And to be honest you start noticing more spots over time.

And in the future, just FYI unless there is a very specific reason to use Killz, like for example you bought a house where people previously smoked, it's usually better to not prime and just do two regular coats. Because the primer can just cause a situation where you need to paint more.

You need to put insulation in the ceiling. Any other attempts to insulate without insulation above is futile since the majority of heat is going to be lost up there.

I would just hire a company to come out an blow insulation up there. I just had my one car garage done for $650 and they had to build an air vent along the soffit on one side. It was really worth the pros doing it and me not having to take hours or days to learn how to lay insulation properly on exterior walls.

In Cali I'm sure its probably pricier but when I priced it out to pay someone to do it was about as much as it would be for me to buy materials.

You will never find a concrete slab that doesn't have cracks.

The problem is when they get large and have height differences.

If there is asbestos in all that, I would hire a remediation company to remove, and yeah you are going to lose the wood floors.

The only way I can think to keep them is by planing them down to remove the outside.

You are talking extreme labor and time as well as obscene risk to your health.

There is no way you will be able to do this properly with the floor laid in place. You'd have to pull up each plank and plane. You'd have to anyways and refinish the floors for them to not look like complete shit.

Grout is going to need to be redone over time. Especially in those areas that take on any flex at all (like right next to the tub).

Rust would indicate metal of some kind. Either a trim piece or the tub insert itself is like cast iron (which in that case you would be able to keep it).

Looking at the photos, that seems to be very normal and expected grout wear. You can dig the grout out and re grout, and then caulk along that tub line.

Or yeah if you want to just redo the whole floor. Just get a sledge hammer and start breaking it up.

But none of that is alarming at all.

Watco danish oil all over. Let dry 48 hours (and obviously dont walk on it) then like multiple coats of poly. Like multiple coats. I’m thinking 10.

Hopefully you dont need to use the steps for several weeks.