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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by on August 23, 2005, 11:10 am
I'd replace all the knob and tube wiring with romex while you have
access to that area. I'd only use IC rated lighting. I also would not
fill the entire space with insulation. There should be air space with
vents for a way for air to enter and exit above the insulation. This
keeps the temps down and prevents moisture problems. Plus in your
area with milder climate, you can get by with less insulation.
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Posted by Scott on August 24, 2005, 12:07 am
How about the p2000 foam insulation: http://www.p2insulation.com/
For 1 inch, installed with seams properly taped and an air space like
you have, you can get close to R-40. Yes... 1 inch... r-40. It's
expensive but great for limited space. A number of the timber framers
around here are starting to use it since it's so useful for limited
space areas. The 1 inch of p2000 gives better r-value than the regular
rigid foam they used to use. I understand it's been used commercially
for some time and is just now getting onto the residential market. From
the literature it seems it gets it's high r-value by addressing
radiative and conductive heat along with a vapour barrier all at the
same time.
- Scott
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