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Old 11-03-2008, 10:58 AM   #16
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blown in attic insulation, replace or add to


Here's a chart. I'm in zone two.
http://www1.eere.energy.gov/consumer...nsulation.html
but I used a chart from a DIY book.

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Old 11-03-2008, 04:24 PM   #17
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blown in attic insulation, replace or add to


It charts like that, that 10 years down the road, make people say I should have put more insulation in.

Those are based on current utility cost.

If the utility cost were 25% higher, they would recomend a higher insultation value.

How sure are you that your utility cost will be the same ten years down the road.
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Old 11-10-2008, 08:25 AM   #18
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blown in attic insulation, replace or add to


I think it is more along these lines
http://en.wikipedia.org/wiki/Diminishing_returns

If the insulation and the elec. power were both free, you would still not get additional benefits from very thick insulation. The first inch of insulation you put in gives much more benefit than the last inch you put in.

I guess when your attic is adequately insulated you should look for the next largest source of heat loss. I think the attic typically accounts for only 25% of the total loss. Audel's has a pretty good set of books on this subject.

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