Ok, I'm answering a few of my own questions. I looked at a photo of us replacing some windows and we have Dow STYROFOAM™ TG which is a WRB. That's good.
Wow. Didn't realize XPS existed back in the 80s but that technology is 50 years old. That's awesome.
So I suppose after we take off all the old siding we'll need to ensure that's all intact replacing any sections as necessary and ensuring all seams are properly taped all around.
foam ''can'' be a wrb, not necessarily is it in your case,wood siding should never be nailed directly over the foam,there needs to be an airspace between wood siding an foam
you need a drainage plane behind wood siding. this allows moisture to properly drain. if the back of the cedar siding is moist and the front exposed to the sun then you get wrapping as the front dries out faster than the back.
moisture from behind will shorten the life not only the siding, but any paint or stain that is applied.
there are rain screen products available, a plastic mesh that would be installed behind the siding. just google "rainscreen for wall" and you'll find all kinds of useful information.
I must be honest, we do not use rigid insulation on the exterior walls in my area so I'm not the best person to answer.
You do need to have a weather resistant barrier, but I do not know if the XPS you have installed would be considered one or not. Even if it is you'd need to tape the joints.
Sorry I could not be more help, good luck with your project!
That was an enjoyable thread, glad I got to catch the tail end and see how it all worked out.
I do have a few questions;
Did you use the rainscreen that comes in a roll or the lotion type?
If you did not use a rainscreen, did you use stretchable wood siding so it would last?
" where the foam is damaged. Should I replace those areas with T&G XPS, OSB, or something else?" Use something else, anything else. Bit late to ask, doncha think? What did you use?
"Final product:" Completely finished. I like the permanently attached ladder, very convenient.
Rewound that is a supremely excellent job. It fits into the setting way better than before, and I'd bet it is structurally better than B4.
I'd best go, people are gathering rocks, they're gonna start chunkin' at me any minute now.
"
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