Just got done fishin' a replacement NM home run for my customer's house (the same one with those "compliant" installations in the pictures board).
House is a hip roof (all four sides slant), built in 19 ought-something (old house smell), with blown in fiberglass insulation in it - and I'm face first in the stuff reaching into a 5"x5"x6" triangle access by the corner to snare the lead wire to pull up the NM.
Came down with a cold over the next few days - figure it's my immune system telling me to mask up next time.
BTW, 16" o.c. = 16-24" more-or-less in old house construction. And the abandoned knobs from the K&T make great knee-catchers!
