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PostPosted: Wed Feb 17, 2021 6:55 am 
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Posts: 14
gullfo wrote:
in general, foam is limited in it's range of frequencies it will absorb effectively. if you can building 3-4" (75-100mm) thick semi-rigid insulation type absorbers for the doors, and at each end of the stair case, plus two more on the ceiling above stairs if you have the head room.


When you talk about absorbers, do you think about that? (wooden frame with semi-rigid rockwool inside?)

Attachment:
1-Panel.jpg

Attachment:
2-Panel.jpg


If so, it is my understanding that they are most effective when they are not directly attached to the door/wall, but there is a slight air gap behind them.

For those with ceilings, no worries:

Attachment:
1-Ceiling.jpg


For the doors I have seen this:

Attachment:
1-Door Panel.jpg

Attachment:
2-Door Panel.jpg


But at the limit I thought more about gluing the wood cleats directly on the door, fill with rock wool, and fix a wooden plank to the dimensions and cover with fabric.

Please excuse me for insisting but do you think that the wall is too thin and that I should make an absorber again as I was advised? (about 15cm thick)

Attachment:
4-Séparation local cage d'éscaliers-min.jpg


Thank you very much ;)


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PostPosted: Wed Feb 17, 2021 10:39 am 
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Joined: Wed Jul 13, 2005 3:55 am
Posts: 5024
Location: Old Tappan, NJ USA
nice absorbers!

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Glenn


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PostPosted: Wed Feb 17, 2021 9:00 pm 
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gullfo wrote:
nice absorbers!


Ah ah they're not mine, it was to see if you were talking about that but I have my answer.

Just to be sure: I read that they must be separated from the partition where they are installed for more efficiency. (Air gap behind). Is this true?

Then for the walls don't worry, but for the doors is this disturbing if I fix the panel directly to the door (in fact door and panel would become one).


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