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Posted by Carpenter on September 17, 2006, 12:03 am
Good tip. Thanks!!!
marson wrote:
> i don't have that number in my head, but 15" sounds about right.
> should say on the bag. instead of measuring the depth in the attic, i
> like to go by square footage. if you know the square footage of the
> attic, you can purchase enough insulation to fill the area to R 49. say
> 50 bags. then divide the attic into say fifths, and blow 10 bags into
> this space. in this way you will get an even distribution. if you go
> by depth, you will wind up at the access blowing it three feet deep at
> the end or you will run out. note also that th 15" is a settled
> height. you'll need a little more than that to allow for settling.
> Carpenter wrote:
> > My first reaction was also to go for R49 while I was doing it, but it
> > takes 15" to reach that R value with cellulose?
> > marson wrote:
> > > blown cellulose (yes it looks like shredded paper) is the way to go in
> > > an attic. not sure why fuel source would make a difference (unless
> > > they are calculating the payback period) but whatever the case, why not
> > > blow in R 49 as long as you are going to the trouble.
> > > Carpenter wrote:
> > > > I need to add some insulation to a two story house with a metal roof. I
> > > > am starting from the attic because seems to be the most needy. Access
> > > > is difficult, so the insulation has probably to be blown up.
> > > >
> > > > Have checked Lowe's and Home Depot but they only carry some stuff that
> > > > looks like shredded paper. Is this what I should use or is there a
> > > > better product?
> > > >
> > > > Also I am confused about the R requirements: It's R38 in my area (SE
> > > > Texas) with gas or other fuel heat, but the tables at the shop say has
> > > > to be R49 if you have an electric furnace. I have electric HVAC but
> > > > can't understand why the R value should be different.
> > > >
> > > > Thank you for your help
> > > >
> > > > Art
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