Rotting wood around door

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I don't know if it's just because it's late but I didn't 100% understand what you meant on how to replace the board. It must be late because it seems like figuring out how to do it should be the easy part and actually getting it done another story...
 
The piece in question runs from corner to corner, left to right, along the exterior wall at a level immediately below the floor. There's no subfloor or anything here.
 
I would bet that at one time the stairs were back under the roof and that is why they have the extra wall there and not in the center of the porch. So that beam might join at that wall below the window.
Look at it like good catch, this could get real bad in another year or two.
The door frame will have to be pulled too so you can add a new aluminum threshold to it. and there is some stud repair there too.
Once you have that white board off you can get the correct height measurement and some good photos before you pull it out, You want to have everything ready for a quick change.
We only have to worry about supporting the roof over the door and that first window
 
Do you mean the white board just below the door and behind the stairs? That was screwed in before the stairs were poured because we can see the screws behind the stairs so that'll be fun.
 
Do you have a sawzall, the board behind it will go too but you may want to support the wall first.
 
The board behind it is actually the one that needs to be removed.
 
It appears that you are working with a porch that has been closed in and the original porch floor is the subfloor sticking out under the door sill. The rotted wood below the area will need to be cut out and replaced. Do you have access to the area below the porch? If not you will need to pull up the flooring to replace the band joist/beam below the door. Those flashings are made to go under a door sill or under siding or trim around Windows. Your door does not have a sill which normally would have come out past the side jamb. You have a threshold strip. Pull the threshold strip up and you can cut the porch floor back just short of the back of threshold and replace with a horizontal piece. It should extend out past the one by trim at the landing. The threshold will cover the seam at the back. You will probably have to scab the band joist to support the cut floor. This is all after you have repaired the band joist.
 
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