I have a 1901 Victorian located in the San Joaquin valley of California and slowly I'm removing the lathe and plaster and redoing everything from new electrical to plumbing. While the walls are open I'm putting in fire blocking to my balloon framed home and I also want t insulation. My question is if I need to use tyvek paper and if so which way does face and do I do it only in between wall studs? Or wrap studs too. Any help would be greatly appreciated.