studio floor

[shipshape]

Does anyone her know if putting down a layer of rubber under a carpeted floor adds any sound insulation at all between floors of a house ? Any help would be appreciated.
Peace Shipley

[edyer]

I can only speak from my experience with walls.
I used 1/2" stall mats, which are very dense rubber, in between two layers of 1/2" sheetrock. This was done on the wall between the control room and the live room. The results were very good. The isolation I gained in my control room is excellent. I can barely hear drums through the wall and I suspect that what is coming through is mainly due to the two layers of 1/8" laminated glass I used for the window. As far as a floor goes I see no reason why it wouldn't help.
I posted the same question as you but relating to walls over at the John Sayers Site and got a lot of response from some very educated people.
The consensus seemed to be that since I was adding a layer of material that had different density and mass as the sheetrock that it would disrupt the transmission of sound through the wall. The fact that it was very dense material, it was suggested, meant that it would disrupt low frequency waves as well as higher frequencies.
I'm no scientist but I can say that bass guitars turned to nuke don't get through very well at all.

If it helps try www.johnlsayers.com Do a search on experiment time ( or fun with rubber ) and you may be able to find the whole thread. It may also be under eric as the author name. hope that helps
Eric

[edyer]

Holy crap I just reread that whole thread myself.
I forgot what a confusing decision that was !!!

[Berolzheimer]

As Edyer said, any time you make a sound wave transition from one material layer to another with a different density & thickness, it will lose energy. That includes air as a layer, but as you don't want the layers to be too resonant at any one frequency, if you use air as a layer you should fill the chamber with fiberglas or polyester insulation which spreads the Q value.
Another thing that helps is if you can avoid coupling the layers, especially the outer ones, together with nails or screws.

[djui5]

Originally posted by Kent
Nice to see ya around, Mr. Shipley.

Agreed!


Sorry I can't help with the rubber thing though....

[C.Lambrechts]

I'm sure it will to some extend but sincerely doubt it will be very effective. I suppose that if you say between floors in a house you mean you wanna isolate a room from another room right ? like upstairs / downstairs ?

In that case you will probably keep the vibrations away from the floor itself but at the same time you might enhance the vibrations going to the walls.

Principle of an 'acoustic window' comes to mind. The walls will still transfer the vibrations to down or upstairs.

The actual benefit from doing the rubber thingy like you describe it might end up being very dissapointing I think. The only way to effectively do something in your case is create a box in a box situation I think. And those do not have to be excessively over expensive to work well. They just have to be built well.


Then again ... I'm not an acoustic expert ... just have been talking to a bunch of them cause we're buiding a little complex ourselves here.


good to see you back Mike.

[Jules]

Ahoy Shipshape!

I put down this weird shredded rubber underlay R10 under my wooden floorboards in my live area.

It is made out of shredded car tires apparantly.

I was / am happy with it.

But there is no one below me.

The guy here is good to talk to

http://www.customaudiodesigns.co.uk/...g/underlay.htm

[Drumsound]

Welcome back Shipshape!

[picksail]

Good to see you around here again Mr. Shipley.

[SpaceChild]

Welcome back, Captain!


Spacey

[clip6]

Mike glad to see you here. Don't you have a hot line to all the great room designers? Anyway we see Bob is taking the C200 for a test drive. I know you have tested the console what do you think? Also how's the ICON?

[clip6]

http://www.soundprooffoam.com/vinyl_barrier.html

I would think thin lead sheet would be more effective but they say this is.

What's your favorite new piece of gear lately?

[Bob Olhsson]

Westlake used to specify the heaviest duty rug padding available. (I forget the rating) that are ordinarily used for office building lobbies.