R30 or R60 - attic insulation

60 is always better than 30.

Duh.

You might consider the spray foam type. If the house allows, you may even consider spraying the roof rather than the ceiling. the people that I know who have had this done seem to have gotten good results.

On the original question, more is better but the crossover from a cost benefit may not be there for R60.

FWIW, the recommendation for our region is R30 to R60 in an uninsulated attic, so no help there.

www.energystar.gov

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Should I just install it myself or hire a contractor?

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Self

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Install over existing insulation?

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Yes

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Install over existing insulation?


Yes

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Wouldn't that change the R value?

Installing or adding insulation is easy. Ray Charles could do it. But you might want to consult with an installer about adding more to existing. You don't want to mix and match different types and too much is actually not a good thing. You can actually cook your shingles from holding in to much heat in the summer plus other mechanical issues like trapping in damp or humid air inside the house causing mold over time. I'd consult a professional and get their opinion before you throw a bunch of new insulation in the attic?

Blown insulation is so cheap. Contractor price on batts is about the same installed as if you buy it off the shelf at Lowes, so get it installed. Same with blown.