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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by abi on August 23, 2005, 11:50 am
I beg to differ on a couple of points. Cellulose insulation isn't
flammable. There are a lot of borates in the formula that make it
impossible to ignite. Grab a handful at Home Depot and put a torch to
it. I have. Won't burn. Foam is flammable, but there are formulas
available today that aren't like they were 10-15 years ago. Foam burns,
but the smoke, though colored differently than the smoke from the wood
(less water vapor in the foam) the chemical make up of the foam is no
more toxic than the smoke from the treated lumber. That is a fact.
Also, most foamers will build a drywall high hat and surround it with
mineral wool and foam around that. Mineral wool doesn't burn at all.
But, this application seems more of an air sealing application than a
insulating application given that the extremes in temp aren't a factor.
Of all the options, what is the best air seal choice? Not the
fiberglass, that's for sure.
abi
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Posted by on August 24, 2005, 9:57 am
If it were my house I would replace the crappy old knob and tube wire
with something good like armored cable and have foam put in so you can
get good R value with enough space left open for venting (add vents if
you need to). I would also be tempted to replace the in house light
fixtures with new ones that could support some serious weight so that I
could put in ceiling fans if I wanted to. You really need to get rid
of that old wiring for insurance purposes.
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Posted by D. Gerasimatos on August 22, 2005, 7:56 pm
I don't know the answers to your questions, but make sure you do not
put insulation on top of the knob and tube wiring. It is against code
and it is a fire hazard to do so.
Dimitri
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Posted by Joseph Meehan on August 22, 2005, 9:25 pm
D. Gerasimatos wrote:
> I don't know the answers to your questions, but make sure you do not
> put insulation on top of the knob and tube wiring. It is against code
> and it is a fire hazard to do so.
>
>
> Dimitri
I believe that is correct. Knob and tube by itself is very safe wiring.
It will support more power than today's cables of the same size. However I
seem to recall the prohibition against covering it.
--
Joseph Meehan
Dia duit
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Posted by on August 22, 2005, 3:33 pm
Hi Everyone,
Wow, newsgroups are the best!!
In San Francisco, knob and tube wiring can be covered with insulation
(fiberglass or cellulouse but not foam), just as long as a qualified
electrician inspects it and qualifies it with a certificate. I'm also
more curious to what everyone says about the humidity/condensation.
Thanks
-kelly
Joseph Meehan wrote:
> D. Gerasimatos wrote:
> > I don't know the answers to your questions, but make sure you do not
> > put insulation on top of the knob and tube wiring. It is against code
> > and it is a fire hazard to do so.
> >
> >
> > Dimitri
>
> I believe that is correct. Knob and tube by itself is very safe wiring.
> It will support more power than today's cables of the same size. However I
> seem to recall the prohibition against covering it.
>
> --
> Joseph Meehan
>
> Dia duit
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