Just an idle thought–and I’d imagine it’s been hashed around before, but if the housewrap is supposed to be the sheathing guard of last resort, why not install and flash the windows first, then put on the housewrap last, over the installation fins, so that no moisture could get to the windows in the first place?
This came to mind today as I was putting a second layer of Tyvek on one wall of my house–I tore off the siding earlier, and removed the window trim yesterday. So then I put on some more butyl rubber flashing around the window fins, and then the new Tyvek over it, but I was wondering why things weren’t done that way to begin with? Anyway, I’ve now got my windows sandwiched between two layers of Tyvek. Is this a good plan, or is there something I should be worried about?