Hi-- I am in a house that was built in 1921. It has knob and tube and is still running electricity that way. We've had an experienced electrician come and inspect all the wires and breaker box and retrofit all the plugs to be grounded. We asked him if cellulose could be blown in over the knob and tube and he said that'd be fine because the wires are still in good shape. I called an insulation company with experience in knob and tube and they said it's fine, as well. Especially because cellulose is non-flammeable. I still have reservations, though. Despite both the electrician and insulation company saying it's safe, I'm worried. Should I be? Has anyone else blown in cellulose over knob and tube? Thank you!