CJT wrote:
CJT wrote:

louie wrote:

Adding 6" of cellulose to the attic will help tremendously, so long as
the soffit vents are kept open with some baffles. You'll add an
average R value of 3.5 per inch of the cellulose so you'll increase
your attic insulation from R-19 to R-40.



Which is what, about 3% difference in heat loss?


Oh, and that's the heat loss through the attic, which is only a
fraction of the whole-house heat loss.

As you can probably tell, I'm skeptical.






But you are wrong. Since heat rises, especially in hot air heated houses,

the temp differential is much higher on the ceiling than on the wall.
There is absolutely a point of diminishing returns, but if you do a real
heat loss analysis on your house[it is not difficult, a pocket
calculator is helpful, but not required] you will find that half the
heat goes out the windows, and half the remaining goes out the roof.
SO if you take that[gross] generalization, and you burn 1000 gallons of
oil a season, figure 250 of it goes out the ceiling. At 2.50 a gallon
that is 625 A SEASON. Are you betting on a return to 90 cent a gallon
oil? I'm not. lets say with these made up numbers you have r20 in the
attic, the numbers tell you that it should save you 125 gallons a year
by going to r40.