Spray foam's great, but honestly, I've had decent luck just using fiberglass batts with a proper air gap. Did it in my garage roof—noise dropped noticeably and no moisture issues yet after 5 years. Sometimes simpler (and cheaper) solutions do the trick just fine...
Good point about fiberglass batts—I've seen them perform surprisingly well when installed correctly. The key really is that air gap you mentioned; without proper ventilation, even fiberglass can trap moisture and cause issues down the line. One thing I'd add is to keep an eye on areas near vents or penetrations; sometimes fiberglass insulation can compress or shift over time, reducing its effectiveness. Have you checked yours lately to see if it's still holding up evenly? Curious to hear how it's aged after five years...
"sometimes fiberglass insulation can compress or shift over time, reducing its effectiveness."
That's a solid observation. I've seen plenty of cases where homeowners assume their insulation is fine, only to discover it's shifted or compressed after a storm or heavy winds. Usually, it's around vent pipes or attic hatches—those spots seem to get disturbed easily. Have you noticed any drafts or temperature inconsistencies lately? Might be worth a quick attic check, especially after five years...
Had a similar issue a few years back. Thought everything was fine until I went up to grab some Christmas decorations and noticed insulation bunched up near the attic hatch—probably from me climbing up there every year, lol. Honestly though, fiberglass does shift easier than you'd think. Not sure I'd blame storms or wind alone... sometimes it's just gravity and time doing their thing. Worth checking once in a while, for sure.
Fiberglass definitely shifts over time, but attic hatch bunching usually points to frequent access rather than natural settling. Did you notice any drafts or temperature fluctuations after repositioning the insulation? Could indicate an underlying ventilation issue...
