Moisture barrier: it traps the humidity in places you potentially don't want to
This is more applicable to fiberglass. How does humidity somehow get past the foam while being kept there? I never see any evidence for these claims.
Structural strength: yeahhhh... no
Foam adds rigidity to wooden structures. This is actually very commonly brought up and noticed where houses creak far less on top of the sounds proofing. Saying "yeahh.. no" is not evidence of anything.
Longevity: not more than anything else, a pain in the ass to replace though
Definitely more than fiberglass, since fiberglass can sag and flatten over time.
offgas for years is good for air quality
This is not typical and happens when it is installed poorly.
This is more applicable to fiberglass. How does humidity somehow get past the foam while being kept there? I never see any evidence for these claims.
Structural strength: yeahhhh... no
Foam adds rigidity to wooden structures. This is actually very commonly brought up and noticed where houses creak far less on top of the sounds proofing. Saying "yeahh.. no" is not evidence of anything.
Longevity: not more than anything else, a pain in the ass to replace though
Definitely more than fiberglass, since fiberglass can sag and flatten over time.
offgas for years is good for air quality
This is not typical and happens when it is installed poorly.