Hello all...I have a few questions here after removing an old laminate floor and the vinyl flooring that I found below. After getting down to the subfloor (to prep for new wood flooring), I found a small water mark close to the French doors in my dining area. I also now have a sagging metal threshold and can feel a breeze coming into the room from outside. My questions are: 1. What is the best way to fix the gap/sagging issue (shims, composite piece to fill section under doors)? 2. Besides insulating foam, should I use some other method to insulate/water proof this area? 3. Although the subfloor is not rotted or seems to have lost structural integrity, should I consider replacing that section of flooring prior to having the new wood floor laid down? Thanks to all for reading and responses.

Have 4 rusting metal basement windows that I wanted to replace with something more energy efficient (and vinyl so no more ugly rusting). The catch is that they are installed into our poured concrete foundation. Ive had one basement co out (Basement Systems, seemed like a nice company, no marketing blitz to try and upsell anything, etc). They gave me a quote but the sales guy said he would need to check or have someone else come out to set expectations on how the finished job would look (basically because he wasnt sure what they could do with the existing metal frame....if it could be removed, etc). Assuming they cant (or wont) do it, I was wondering if anyone had suggestions on how (if?) I could do it myself. One of the frames is completely rusted thru in some spots, and because of that I can see the whole frame isnt inset in the concrete, just the edges, almost like the foundation was poured and the windows were pushed into the concrete before it dried. I really wanted to avoid having to use the existing sill/frame, because they are metal and rusting away. Thanks in advance. -Chris