We live in an early 1970s ranch style house. Single story. Attic formed by the 2x4 trusses on 24 inch centers. The insulation is R13 batt layed on top of the ceiling dry wall but this has been removed in some areas such as over the kitchen by a prior owner.
I am planning to replace the batts room by room with R30 or thicker batts. Is there any problem with doing so? The insulation will be higher than the 2 x 4 and there would be a small gap between batts due to the trusses.
Could I also lay additional unfaced batts perpendicular to the batts in the truss bays over the R30 batts? There would be some compression.
I did some searching in the forum and did not see a set of similar questions although What's the best way to insulate an attic with 2x4 joists? is close.
Loose fill would work over the bedroom and kitchen areas, but the living room has a cathedral ceiling so batts would seem to be the best choice there.