Sure, but going from R50 to R60 you wont see much of a difference in terms of savings per month.Jerico wrote: ↑Jan 12th, 2018 11:53 amIm sorry I dont agree.... There is a law of diminishing returns on insulation but more insulation WILL lower your heat/AC bill. But no sense putting in R120 and spending double to get an extra 5% efficiency (numbers are an example obviously).
Personally when I did my own attic I calculated R60 to be the sweet spot for cost vs gain.
Based purely on what the guy said when he was explaining it to me, he said that getting to r50 will get you to about 4% loss, and getting up to R60 will tweak that a bit but not drastically.
If anything, once everything settles over time, having R60 will mean you might get to R50 at some point where R50 will mean you might drop to R40.
End of the day do what is right for you, but know that after R50 you get minimal gains and savings basically.