Soundproofing an air gap between the entry floor and my basement room

[tmcmoore]

I'm living in a basement apartment, but for some reason the original designer left about a foot airgap between the wall and the stairs up to the second level, so I can hear everything that happens in the house as if it's in my bedroom.

Here are some pictures:

https://www.amazon.com/photos/share/LgzSFJBMLFxP0vqmN9EeVNCb0ie98HQb03duBaAsoar

Solidworks mockup:

https://i.imgur.com/NeZpg00.png


I'm thinking of making something with a wood veneer and some rigid foam insulation to help dampen the noise. Is there a more obvious solution I'm not thinking of?

Thanks.

[Randy S]

same principle as a window plug.

http://www.soundproofing.org/infopages/windowplug.htm

use a nice heavy wood as a backer for rigidity and make sure it seals air tight like a cork in a bottle.

Randy S.