This is one of the big "oh no we have a problem" issues in the HGTV renovations.
Knob and Tube Wiring
This wiring was done from the late 1800's to roughly 1940.
This is the knob. The wires are fed through the guides to keep them from touching the walls.
These are the tubes. The tubes insulated the wood from the wires.
This is how the tube went through wooden beams & supports. The tubes insulated the wood from the wiring to.
In my attic insulation, there was evidence of the wire covering being chewed on. A fire hazard!
I had all the wiring replaced for peace of mind. It was a big and messy job! Expensive too!
The original light fixtures had to be rewired too! I kept what I could because I loved most of them!
I loved the push button light switches. Fortunately, I found safe reproductions!
to see more pictures and more of the process!