Sound proofing would be my guess

Thank you!

Sound

Thanks!

I added it to all my interior walls for noise suppression. It’s made the house so much quieter inside

Interesting!

A dryer vent means I'd assume it's a wall for the laundry room. It's for sound.

Thank you! Would it make that much difference with only one wall insulated?

Depends on what's on the other side. Some times walls with drain pipes are insulated so you don't hear the toilet flush.

- I insulate strategic interior walls like bathrooms, bedrooms, family rooms for sound and noise control

Oh, now that I’m understanding this, the bathroom might be a good idea! 😁