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jlSF

06:20PM | 09/20/02
Member Since: 09/19/02
2 lifetime posts
Bvdecor
I live in a c1900 house that was converted (probably in the 50's) to apartments. My problem is insulation from noise, or lack thereof. During some recent repairs we noticed that the space between the floos of the building has extra planks of wood in it. We're told this was a common insulation technique in the era our building was contructed.

Strangely, we have fairly good noise abatement from room to room within our flat, with the exception of the wall adjacent to the street outside. The problem is, we can hear EVERYTHING from the floors above and below us. From the most normal conversation to (sometimes) too loud bass-laden music, it can become quite disruptive. The people who live both above and below us are good people, trying to enjoy their hobbies also.

What can be done about this kind of situation? And would and true remedy mean tearing up the flooring and great expense?

many thanks!

Lawrence

04:30PM | 10/29/02
Member Since: 11/14/00
333 lifetime posts
Wood is a poor sound insulator because it is neither dense (like rock) nor pliable (like foam). If anyone used it to insulate the floors for SOUND, then they were really backwards. Because of its physical properties, wood transmits sound waves through it, especially low frequencies. Thus, the ideal wall between apartment units has two independent, unattached wood frames standing next to each other, with the studs staggered from each other so that sound does not tranfer through the wood from one apartment to another.

Ironically enough, dead air space in a wall or a ceiling often serves a tremendous purpose in sound insulation because it interrupts the transfer of the low-end vibrations: namely, when the bass physically "shakes" physical objects. In other words, sandwiching dead air space between two solid surfaces provides better insulation than those two surfaces pressed together.

If the space between your ceiling and the floor above you is all solid material, then removing some of that material and replacing the ceiling would work well. If you have the room, you might also consider a drop-down ceiling to create that dead air space between what now is your ceiling and what was your ceiling. The tiles used for drop down ceilings, although ugly, are called "acoustical tiles" because they also absorb sound.

You can also consider replacing that superfluous wood (if it really is superfluous and not serving a structural need you have not figured out, yet) with actual sound insulation. Instead of transmitting sounds waves through a solid wood substance, insulation deadens and absorbs the waves analogous to the way a spring absorbs physical shock.

rpxlpx

02:52AM | 10/30/02
Member Since: 03/13/00
1678 lifetime posts
To avoid any construction, you might first try some thick rugs on the floors. Not the wall-to-wall carpet, but real, heavy rugs.

[This message has been edited by rpxlpx (edited October 30, 2002).]

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