I worked on my in-laws place again yesterday, and after stripping away some of the trim boards, I discovered the carport wasn't as racked as I initially thought. Maybe 1" out of plumb instead of the 3-4" I originally measured. That's straighter than the house itself, good news there.
So, I started connecting the carport with the house structure, and by the time I got the sheathing built out for an even plane up the entire wall, I was happy to discover the flashing fit tightly against the sheathing as-is. It's a bit angled near the bottom, but not enough to be an issue. http://www.mountain-software.com/clark/flashing.jpg
So, the siding will lap the flashing just fine. I decided to just order the Dryflekt kickout diverter flashing so that should take care of the water running down the wall at the intersection. I still need to replace the fascia board near the house, but otherwise it's all good to go. The windows are supposed to arrive this week, so I should be able to get those in next weekend.
New problem (more accurately, an old problem), the carport is built on a simple concrete slab. This put the siding/sheathing way too close to the ground, 2" at most, almost touching in other areas. As you would expect, the siding near the ground has serious rot issues.
Obviously, building a new foundation is out of the question right now, as is adding a row of block or bricks at the bottom of the wall. So, I'm looking for more of a "quick fix" make-do solution. I wish I could do the job properly, but it's just not within the constraints of time or budget right now.
So, I'm thinking of ripping off the bottom 6-8" of the rotted siding, and attaching a strip of something a bit more waterproof. I initially thought of using something like cement based Hardie siding, but I don't know if it would hold up in a near ground contact situation like that?
Another option might be composite decking like Trex, but again, I don't know if it would hold up in ground contact? Also, it's a lot thicker than I need (1-1/2 vs. 1/2") so I would have to rip it into thinner strips. But for that to look nice I would need to run them through my planer afterwards, and I have no idea if composite decking material can be planed successfully? I've only seen Trex in 2x6 sizes, so it's a little shorter (5-1/2") than I had hoped, but it's better than nothing if the thickness and rot resistance worked out.
The other option I thought of is that PVC trim board material. Unfortunately, I can't say I've ever seen it available locally, and I believe it's only available in white?
I haven't used any of these products myself, so I have no experience with them. Are there any other options I may have overlooked?