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What is the "code" method of adding heat tape to pipes inside a wall?
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I don’t think that would meet any code burying heat tape in a wall.
Fire hazard when left unattended, small chance, but a chance.
It does not get hot in the lower wattage residential types, just warm so putting pipe insulation over the heat traced pipe would be needed.
Just pipe insulation *might* do it.
Just what I would do, not what you should do. I’ve installed and supervised miles of that stuff on gas process piping, under insulation. No fires yet.
You guys got hit with the event of the century. Even in my place, built for extreme cold, I would have problems if I lost gas/power.
Your event has me buying a second genset and spare 20lb propane tanks.
Hopefully the power/gas plants there prepare better for the next time, that is the best hope for keeping stuff going.