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Knob and tube articles
Shorter pieces from Decker Boston Knob and Tube on the moments when old wiring becomes a question in a Boston-area house: a space heater in a cold snap, a Mass Save assessment that stops the insulation, a change to the Massachusetts Electrical Code, or the order an illustrative triple-decker rewire runs in. The guides cover each topic in depth; these follow one situation at a time.
Latest posts
- Illustrative WalkthroughWhat a Boston triple-decker rewire looks like: an illustrative walkthroughAn illustrative, composite walkthrough, not a real job: how an occupied three-unit Boston triple-decker moves from the first visit through inspections to the papers at the end.
- Dates and DeadlinesWhen a Mass Save home energy assessment finds knob and tubeInsulation plans in older Boston-area houses tend to follow the same cycle: an assessment, a recommendation, then a stop when the assessor spots knob and tube. This is the path from that stop to the insulation.
- NewsThe Massachusetts electrical code update and old wiringMassachusetts now inspects new electrical work to the 2026 National Electrical Code with state amendments. For knob and tube already in a house, it matters only once someone works on the wiring.
- SeasonalSpace heaters on knob and tube circuits in a Boston winterBoston averages about 92 nights a year at or below freezing, and a plug-in heater in a cold back bedroom can sit near an old circuit's limit for hours at a stretch.
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Photos of the attic, the basement ceiling and the panel help most.