wall blocking the transition of voice very well

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kenny4528

Senior Member
Mandarin, Taiwan
Hi guys, I wonder about how to say when you're referring to a place such as a house where the sound made from a room cannot be heard from another room, meaning the wall blocking the transition of voice very well. For instance:

A: Sorry we were loud in my room last night. It's a crazy party.
B: No worries. This house's ____ is very good. I could hardly hear what you were doing.
 
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