I am not sure what vent fan you meant, however, I know that when they are taking a shower, they did not turn on the fan in the bathroom, if that is what you meant, and that is only fan I know of in the bathroom.

I have 2 bathrooms on each floor. All 4 bathroom make the same type of noise, just the bathroom in Master room on both floor make louder noise, and bother me most, since I sleep in Master room, and the downstairs start to take the shower at 5am every day. the one in my Master room makes such noise too, but since we don't take the shower while the other is sleeping, so, I can stand for it.

I just invited 2nd plumber, as the first plumber, he concluded the same cause: insulation.

Can anybody please recommend any good Insulation contractors? I heard people can use spray foam and don't need to push down the wall?

Thanks!

Finally, I am done with creating the following audio file. Please hear it, and let me know your thoughts. The impact in reality is more than it sounds, and much louder. My cell phone could not convey such impact.

https://drive.google.com/file/d/0Bw4oo ... xb3VuX3c/view?usp=sharing

I am living in a 2 family independent house, I am on up unit.

it was built in 2007, not old.

Make sense.

Do you know of any reputable plumber you can recommend in JC?
The noise is very loud, in my sense. The entire house can hear it, especially in my Master room.

I am a new owner and live in upstairs in a 2 family house with age of 7 years.

When downstairs tenant is taking the shower, the noise is so loud, the entire house can hear it. she takes shower at 5am everyday, and woke us up everyday.

Based on a plumber who checked, the plumbing has no issues, the issue is the insulation. He suggested to open the wall and put the soundproofing insulation in.
I am planning on doing it from the master room, outside of the bathroom, since open the wall from inside will involve the tile which will be costly.

I need some advice from you. Can insulation reduce this type of noise, or what else should I do?

I am a new landlord, and first time to rent out my apt. Will you please recommend a reputable web site or an agent I can run my tenant's credit based on provided SSN?

Thanks a lot!