Sooo... my attic rafters are only 2x4's. I'm re-doing a bathroom, and removed the insulation from above (had to take the ceiling down). So about to put it back and my question is... is there any point in putting thicker than 2x4? I believe that if the insulation isn't compressed between the 2x's that it doesn't get the proper R value?
At the big orange, I only managed to find 2x4 with 24" spacing that was R-12...they didn't even have R-14. Is there any benefit in getting the 2x6 at 24" which is R20 or will I not really get that anyhow? NOt to mention it will be sitting above the joists... I will likely blow in some insulation anyhow... so should I just use the R-12 and blow in more, or use the R-20 and blow in less? Am I overthinking this? (I do that a lot