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Is Knob-and-Tube *Always* Dangerous?

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Is Knob-and-Tube *Always* Dangerous? pennsylady2002 07-25-2006
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Posted by on July 25, 2006, 6:35 am
I'm sure this question has been posted and answered a thousand times
here, but a family member who routinely asks me to walk-through homes
she is interested in buying (because, as a walking Typhoid Mary of
Money Pits, I have hard-earned knowledge) has asked me to jump on a
particularly desirable (location, location, location) multi-unit this
AM.

One half of this duplex has knob-and-tube.

I have read conflicting estimates of the integrity and safety of
knob-and-tube on this group and other web sites. But I'm scheduled to
go through the home in two hours and thought I'd post and maybe get
some fresh insights.

>From the street, and as far as the exterior foundation goes, this home
is an absolute steal (new roof, great landscaping, has it all). My
family member needs a place to run to as the result of a divorce and
won't be able to take on both the mortgage and a complete rewire at the
time of sale; hence, my post.

Thank you as always for your responses.


Posted by RBM on July 25, 2006, 7:01 am
knob and tube is ungrounded, as was lots of Romex installed in the 50's and
60's . In some places its unprotected and subject to mechanical damage. The
stuff is OLD, but in my experience, most of the K&T I've seen, has been in
excellent condition, unlike rubber covered conductors of BX cables from the
40's and 50's, which breaks down and crumbles from heat. I would ultimately
replace it, but I wouldn't feel in any hurry to do it yesterday


> I'm sure this question has been posted and answered a thousand times
> here, but a family member who routinely asks me to walk-through homes
> she is interested in buying (because, as a walking Typhoid Mary of
> Money Pits, I have hard-earned knowledge) has asked me to jump on a
> particularly desirable (location, location, location) multi-unit this
> AM.
>
> One half of this duplex has knob-and-tube.
>
> I have read conflicting estimates of the integrity and safety of
> knob-and-tube on this group and other web sites. But I'm scheduled to
> go through the home in two hours and thought I'd post and maybe get
> some fresh insights.
>
>>From the street, and as far as the exterior foundation goes, this home
> is an absolute steal (new roof, great landscaping, has it all). My
> family member needs a place to run to as the result of a divorce and
> won't be able to take on both the mortgage and a complete rewire at the
> time of sale; hence, my post.
>
> Thank you as always for your responses.
>



Posted by hallerb@aol.com on July 25, 2006, 8:28 am
probably CANT get homeowners or a mortage with K&T most insurance
wouldnt cover it as a fire hazard.

connections are soldered in the wall, without a box surrounding it.
unlike today all coinnections are in boxes.

after many years and heavy loads the solder weakens and the connection
can overheat and cause a fire, that happened to a buddy of mine
fortunately in his open basement cieling he smelled smoke and put it
out.

in a closed wall the house will go up in smoke.

have friends whos homeowners inspected their home and REQUIRED rewiring
for just this reason.

deduct cost of rewire from home sale price and for futher savings get a
home inspector they arent perfect but every trouble they find is money
in your pocket.

call your insurance agent and ask about K&T and please report back here
what they tell you...

K&T would be safe IF the connections had been made in BOXES but back
then no one thought of it


Posted by on July 25, 2006, 9:41 am
I'm working on a clients house that has K&T. It's a very large house
and the entire 2nd floor and part of the first is K&T and on one
breaker! These people were running an ac unit and 3 TVs plus all the
lights. The problem with replacing this stuff is that all the
connections are buried and hard to find. I've had to make large
inspection holes to make sure I've pulled out all of the connections.
I've also had a neighbor not quite completely close a hot water
radiator bleed vent. The dripping water from the second floor ran down
a major junction of mineral coated K&T in the kitchen. It started a
fire in the wall where there were 5 switches. The responding firemen
had to completely chop out the wall and part of the ceiling to make
sure the fire was out.
Richard

hallerb@aol.com wrote:
> probably CANT get homeowners or a mortage with K&T most insurance
> wouldnt cover it as a fire hazard.
>
> connections are soldered in the wall, without a box surrounding it.
> unlike today all coinnections are in boxes.
>
> after many years and heavy loads the solder weakens and the connection
> can overheat and cause a fire, that happened to a buddy of mine
> fortunately in his open basement cieling he smelled smoke and put it
> out.
>
> in a closed wall the house will go up in smoke.
>
> have friends whos homeowners inspected their home and REQUIRED rewiring
> for just this reason.
>
> deduct cost of rewire from home sale price and for futher savings get a
> home inspector they arent perfect but every trouble they find is money
> in your pocket.
>
> call your insurance agent and ask about K&T and please report back here
> what they tell you...
>
> K&T would be safe IF the connections had been made in BOXES but back
> then no one thought of it


Posted by Choise76Smu@EhOhEll.Net on July 25, 2006, 1:18 pm
kv888831393ster@gmail.com in

>> connections are soldered in the wall, without a box surrounding it.
>> unlike today all coinnections are in boxes.

never seen that, maybe that's the older knob and tube. i've seen 50's stuff that
was
connected properly in boxes with the short piece of "loom" thru box holes. (as
well as i
recall)

i've also seen separate ground wire for old two-conductor romex (kitchens) that
had twisted
and soldered connections. i guess if ground wire went into rare effect (lots of
current)
accumulated debris in wall could light up.

older houses had no insulation, so if adding insulation, i think you'd have to
replace wiring
or guess (!hahahaaaaaa) at how far to derate current for knob and tube.

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