Hey Guys, Back Again. I found this thread which looks like it could be similar to what I'm seeing. in the lower left corner but I'm confused about the top. http://www.houserepairtalk.com/showthread.php?t=9348 I bought this house about 6 years ago having someone hack in some new windows 3 years before I bought it and said I'll fix it later. 4 years ago we had a really bad winter and even with low humidity at -35F I had ice pushing my trim away from the sliding door inside the house. I had other windows so I cauked it and moved on ATM as I knew I would be working on that. Hasn't happened since Then when I removed the floor by the door and some of the subflooring was bad (maybe up to 1ft from corner) but it was dry and I just cut it out and replaced it to then move on. I had assumed the damage was prior to the new sliding door being put in. NOW I began removing the metal around my sliding glass door outside and think maybe it's time to make sure there isn't STILL a problem. So I'm confused at the top. It's apparently sagged down quite a bit but when I put a bar to the bottom board the wood just splintered and has some fungus. I think that board would almost HAVE to be new, right? Then on the side where I saw the ice I looked down and you can see in the 2nd picture the wood is also very crumbly but dry, even though we just got A TON of rain over the last week. The outter board is in much better shape than the inner board. I bought some PVC to replace the wood HOWEVER I'm now concerned there could be other issues or even still a real problem. What should I look at or do next to determine if it is still a problem, and to what extent?