If home insulation is so great (and no argument that it is), why is my attic 90% air above about a foot of insulation? Why isn’t the insulation 2 or 3 or even 8 feet deep? It works to keep heat out just as much as it keeps heat in, right?
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Here’s an article…
[https://www.energyvanguard.com/blog/the-diminishing-returns-of-adding-more-insulation/](https://www.energyvanguard.com/blog/the-diminishing-returns-of-adding-more-insulation/)
Basically, it’s the law of diminishing returns. There’s a chart on the above sight that has very easily understood graphics of BTU’s of energy saved vs R value. Once you get above the 18 to 22 R value range, the return on investment is minimal UNLESS your energy costs are very high or you live in an extreme climate.
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