Again, have you seen this before? I’m not inspecting it for an inspection. Its a rehab I’m working on and in the literally dozens of homes I’ve rehabbed of this vintage I haven’t come across this before. Its again an 1890s folk victorian. Wood horizontal cladding, balloon framed, with wood plank sheathing over the studs. Interior is lathe and plaster. The plater you see in the photo is against the plank sheathing. Simply have not seen this before is all. I understand its likely providing some insulation value and assisting with sealing but I was curious if anyone had any more information on this, simple curiosity.