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Old 11-03-2011, 01:02 PM   #16
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Knob & Tube -- Cellulose Insulation


One thing you might consider too is having any major appliances or main circuits switched over from k&t. I know how expensive it is to have everything converted at once, but it can be a lot more manageable and safer to have just your washer, dryer, stove, dishwasher, fridge, ac unit, communications centre, and exterior outlets on romex circuits if they are not already.
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Old 11-04-2011, 10:01 AM   #17
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Knob & Tube -- Cellulose Insulation


Lots of good and generally accurate comments in this thread. It is true that the National Electrical Code prohibits enveloping knob and tube in insulation, but the code didn't mention this until 1987, By that time insulation had been blown over and around knob and tube in walls and attics for more than 40 years with no apparent problems. So technically and legally installing insulation over and around knob and tube is prohibited, but as a practical matter doing this does not seem to represent a hazard. As a responsible person I would never advise anyone to violate the code, but in my own home I wouldn't hesitate to blow insulation over knob and tube if the wiring was in good shape. The May/June 1991 issue of Home Energy magazine had a great, informative article on this subject. Sorry I can't attach it, but it's 241K and the limit is 100K.
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Old 11-04-2011, 12:47 PM   #18
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Knob & Tube -- Cellulose Insulation


Thanks Dleaoh.

Can you private message the document to me? I'd love to see it.
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Old 11-04-2011, 12:49 PM   #19
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Knob & Tube -- Cellulose Insulation


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I spoke to an electrician who said he could replace the knob & tube that is in the attic to Romex so that it would be safe to have cellulose insulation around it. His process would be to take the knob & tube that runs up and inside the walls and add a junction box, where he would then change out the existing wiring and add the Romex. The Romex would run throughout the attic, which he said is far safer to cover in cellulose.
Can't do that. You are not permitted to extend K&T ungrounded circuit. Where is he going to connect the ground from the new cable? The new cable must be run back to the panel.
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Old 11-04-2011, 01:01 PM   #20
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Thanks Joed.

If he runs the new cable back to the box, will that work?

I know nothing about how a house is wired, but would it go something like this: outlet --> knob & tube up walls --> romex in attic --> circuit breaker box?
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Old 11-04-2011, 08:50 PM   #21
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All the way back to the box would be fine. That should eliminate all the K&T.

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I know nothing about how a house is wired, but would it go something like this: outlet --> knob & tube up walls --> romex in attic --> circuit breaker box?
That would not be good as the K&T has now been modified and that is not permitted. You need to replace the entire circuit.
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Old 11-04-2011, 09:05 PM   #22
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thats what i was saying about messing with knob and tube. Don't touch anything or replace everything
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Old 11-05-2011, 09:43 AM   #23
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Apparently private messaging is not enabled, as none of the sending options described in the FAQs seem to be available.
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Old 11-08-2011, 12:03 PM   #24
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Thanks, everyone.

Perhaps I should consult another electrician?

My guy is saying he can connect the k&t that's in the walls to a junction box and then to romex, which would run throughout the attic and to the breaker box, being safer for insulation.
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