I wouldn't doubt that everything needs to be ripped out at this point. Especially with how much rain we had over the past week. I would just go ahead and take it all out. It won't take a good sheetrocker more than a couple of days to hang that whole house.
Here's the cities website for all of the building codes. Look under "Adopted Codes and Amendments"
Building Services : City of Bryan, Texas
Framing- Need to check and make sure that your beams & columns are intact and not twisted. I don't know if you'll need to install Simpson ZMAX straps at every other 2"x4" stud on the exterior. (In Houston we have to install them because of hurricanes. I wouldn't think the City of Bryan would require it.)
HVAC- It'll all need to be redone. You'll have to run all new R8 flex lines. (I can't remember what the R rating for solid duct is off the top of my head. I'll post it when I remember it later).
Electrical- It's possible that it can be salvaged. But I don't know what it looks like on the inside. You might have to update all your breakers in the panel box to Arc fault breakers. (Ground fault for bathrooms or kitchen circuits).
Plumbing- hopefully it can all be reused or replaced. I need to see more pics of the inside.
Energy code- Since you are remodeling your house, you'll have to meet the new Energy code and it looks like Bryan is following it as well. New windows and doors must have a Solar Heat Gain Coefficient of
0.25 or less. So I'd try to keep any exterior windows or doors if possible or try to make it look like they are old windows/doors. All exterior walls
MUST have R-13 insulation installed in them and the new attic insulation must be R-38. All penetrations into stud walls or exterior walls must be sealed (i.e. where the electrical goes through the 2"x4" header down to the plug. Spray some expanding foam in the hole to seal it). Make sure your contractor knows this.
REScheck | Building Energy Codes Program
You'll have to hire an independent contractor to come out to do an inspection before you cover the walls in sheetrock.
Just make sure you keep every receipt and log all of the hours you worked on your house. We went through insurance when we lost part of the roof on my mom's house during Ike. They screwed us out of a bunch of money and we paid for quite a bit out of pocket. Hopefully you won't go through what we did.
I'll PM you my cell#. Feel free to call anytime with questions. Let us know if you want any help. We're here for you Rob.