Rotted subfloor, notched joist, & other problems that need repair

[zannej]

Thanks, I'll play around with the layout more when my brain is actually working. LOL.

 

[highup]

Starting width and ending width are the only things you need. All the different end seam locations are random. I'm just saying that you don't need to do any plank layout between the beginning plank and the last one.
Once the first row is in, you set a couple of planks in the second row and be sure that you don't end up with a two inch piece at either end.
Same with the next row. The whole process is about putting down planks and offsetting the joints in each successive row.
Once the first row is in place, lay some planks in the next two or three rows, staggering the joints so it looks nice. With those planks loosely placed, measure an approximate cut length of your first piece, then see if the remaining piece will fit at the end of the next row or the row after. Get a straight row installed, then just start installing.

 

[zannej]

Thanks! That method should work. I really need to get the back hallway cleared out, rest of the walls demo'd, old shower torn out, & get the subfloor fixed.

 

[zannej]

I hope its ok to necro this post since I'm still working on this project.
Got the new back door in (sample of the new flooring is sitting in front of threshold).

Had to replace the jack studs, trim the cripples, and put in a proper header above the door. It's nearly perfectly level/plumb. The issue is that the whole house sort of drops down and slopes to the left side of the door. It's probably about 3/4" higher in that corner. Planks will be running parallel with the door but will start on opposite corner. I need to clean up the debris from removing old jack studs & door frame. LOL.
The old sill was not in good shape but it turns out that the rest of the floor beyond it was ok.

Rotted stuff got cut away

New sill is a pressure treated ground contact rated 2x6

There may be room to fit a drip cap of some sort under the new threshold- which pretty much covers the 2x6. Will have to get better pics of that later.

I have a good idea of how to do the flooring up to that point, but I'm still trying to figure out how many inches into the bathroom doorway I should put the vinyl planks. I believe the jamb is 4-9/16" depth. The actual studs are old 2x4s that are 3-3/4" wide instead of 3-1/2" but I don't think that will make too much difference. The transition trim I'm using between new laundry room and bathroom says it needs a 1" gap between materials. The door will swing away from the planks so it will be more flush with the other side.

My questions:
Can I use pre-mixed floor patch to build up some of the difference/slope in front of the exterior door or should I use self-leveling and mix it myself?
If its the latter, is there a good kind that doesn't require wire mesh and only needs primer?
Is there a specific number of inches the planks should go into a 4-9/16" door jamb if the door swings away and I am transitioning to vinyl sheet (needs 1" gap between sheet & planks for reducer trim)?

Any other thoughts?