First off start by removing all that attic decking , if you want it decked fir up the ceiling joists to make a deeper cavity for r 38 then deck over it. Add some power vents to your roof . This is where you will notice your biggest difference . I'm assuming you are leaving the exterior veener ( brick , stucco, siding etc) and sheating? You could seal along every stud cavity with a foam or caulk then get a blown fiberglass in the stud bays .

^^this


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thanks for the advice

is it better to do a crossing pattern with one layer of r19 between the joists and another layer of r19 laying on top going across them to get r38, or just go with a single thick r38 bat?

so I guess to clarify, is it better to use two layers laid out in opposite directions or just thicker single layer bats? I have actually heard people say that each one of these methods is a "better" way to insulate then the other so im not sure which is the better way.

most cookie cutter construction, I see the two layers used in opposite directions but don't know if that's the better way or just the cheaper way which is often the reason they do what they do with everything.

ok, well I will just go with my "assumption" then, that two layers of insulation laid out in a criss crossing pattern is better way then putting a single high r value layer

Not sure . You could always get the attic blown with loose fiberglass after its sheet rocked

ok, thanks, just want to do it right the first time