Urgent Advice Needed From Builder/Contractor/Knowledgeable People!

Backstory:
The wife and I sold our new construction 5 year old home in the outskirts of town to move into town into a older (1994) much bigger house in a GREAT neighborhood. There were small things to repair and spruce up, all typical of a 23 year old house. Well while attempting to repair a light on our 2nd floor back porch I step on an area just inside the door and I all I hear is CRUNCH. I peeled the carpet back and wanted to pull all my hair out and set the house on fire. I take a step back and say ok. No biggie. I will yank the door, remove that part of the subfloor, brace for the new flooring and order a new door. Do a nice membrane and seal this thing up for life. Well upon removing the damaged floor I find significant damage to the floor joists and rim joist. What are my options here? I think this is out of my realm of ability. Here are some pictures to give you an idea of what I'm working with.

 

We purchased our home in June of this year. The home inspector made no mention of the damage at all and there is absolutely no water spots, stains or damage to ceiling on the first floor. We never go in that bedroom and had I not went to change that bulb I likely would have not noticed until the ceiling fell through. All help is appreciated!

 

Really not that big a deal. It needs to be fixed and the waterproofing needs to be corrected but I've seen much worse. You can sister some new joist sections on with glue and screws. I wouldn't worry about the rim joists. The hardest part will be getting new flooring OSB under the bottom plate of the wall.

Pull the sill plate from under the door and properly waterproof the area and you'll be fine.

 

The rim joist is what had/has me scared. I'm half tempted to tear the damn door out and just put a window in and call it good.

 

The rim joist looks like it has minimal damage. Really I wouldnt even worry about the floor joists. The biggest thing that could cause long term settling is the deteriorated/missing floor sheeting under the wall.

 

The damge on the one side exposes the flashing and a small section of the vinyl siding. I suppose I would need to remove the siding and install a barrier of some sorts over the damaged portion? I will be using a membrane style pan to waterproof the door and may even replace it entirely. I don't want to do this twice.

 

What's the best way to remove the subfloor from under the wall? Chisel and a whole lot of time? It only needs it under the wall from the corner of both doors to the next joist. Shouldn't be to horrible.

 

@23Skidoo may have some advice

 

only thing he can give you is a meme, just kidding I dont know what he does.

Might seem like a lot of work but Id take out the doors and redo/seal the whole thing.

 

OZ-T would lift the house with one arm and repair the damage with the other

 

I’d start with figuring out how the water got in. Is the ledger board at the deck flashed properly, does the door have a sill pan? It’s hard to tell from here. I’d remove the door to do the repairs and access the cause, then go from there. Getting a professional to look at it would be a good idea.

 

NO flashing on the ledger board, NO pan of any sorts. It looks like they built and exact opening, shoved it in with a couple nails and took some Great-Stuff to it. I'm having a contractor that mainly does structural stuff come look at it and give me his opinion on what he thinks needs to be done. If it sounds like something I can do then I will give him some cash and tell him thanks for the advice. If not then I will have him come do it.

 

Glad you’re having it looked at, it’s all fixable, just unfortunate that it wasn’t done correctly the first time.

 

And seal all the cracks with maple syrup.