Before we could have new drywall put up, we called a local electrician to bid out the project of removing ten instances of knob and tube wiring.The bid came in around 0 and the electrician, with an assistant, spent about six hours updating the wiring.When tearing the lath & plaster off of the back hall of our home, built in 1933, we uncovered every homeowner's worst fear—the unexpected surprise of out-of-date electrical work.Our hallway, which leads to our basement, was laden with knob and tube.Your older home’s stately exterior and ornate fixtures have with- stood decades of wear and tear because of solid craftsmanship.But what looks like a well-made structure on the outside can be hiding a dangerous secret behind the walls: aging electrical wires that pose a fire risk.This is all important information to have before undertaking a big electrical project, and if you're thinking about buying a home, you may want to factor it into the contract negotiations.Overall, the benefits vastly outweigh knob and tube replacement cost, making it a smart decision for homeowners.
If so, then your building is almost sure to have what is called “knob and tube” wiring or an ungrounded system. Here are the top 5 dangers of knob and tube wiring.Gustafson said knob-and-tube was phased out by the 1930s.As it ages, he said, it will wear down from the current going through it, especially at the connections.Shocks and fires can easily result from faults caused by knob and tube wiring.2) Knob and tube wiring uses sheathing for insulation and both of these disintegrate easily over time.But why is it so dangerous that nobody wants to insure it?Is it something we should fear ourselves if our homes already have this type of wiring?After all of the knob & tube wiring was updated, we were able to put up insulation to prepare for the drywall workers coming in.Mollie, Quality Smith Employee; Project Started July, 2010 If you have knob and tube what can you do as a home owner? Finding knob and tube wiring could mean your project's postponement or altering your remodeling plans because of insurance and safety reasons. Many insurance companies refuse to insure houses with unsafe knob & tube wiring and fixtures.When they ran the wires, the knobs would keep them off the frame and prevent them from electrifying the wood.Tubes were used when the wires needed to go through joists.