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In Reply to: Any tweaks for reduction of noise from adjacent room? posted by Alleria on January 06, 2002 at 15:07:58:
Think in terms of isolation, not insolation for room to room noise reduction.The door is probably a huge 'leak'. AIr seal all around the frame ofthe door, using weather stripping type materials: foam, rubber strips, ALL AROUND the door.
If you literally seal the door crack all the way around, this will provide a huge improvement.
Unfortunately, after this relatively easy step, things get a LOT harder to get further improvements.
If the option is there, you might want to consider some of that expanding insulating foam in a aerosol can, which only needs a small hole to inject it into the hollow center of the wall between the two rooms. This would be the next best improvement.
You would have to do every hollow isolated section of the wall (look at how most walls are constructed, with vertical frame members, and crossbraces on every vertical member), and be careful not to make a mess by having a plastic dropcloth in place if the foam starting dripping from the hole OR oozing out from cracks or crevices. These types of foams ususally recommend a wet cloth to wipe up such spills IMMEDIATELY, so you may need a partner to help keep the mess down to a managable level. The foam also stinks, and might need to have ventilation for a day or two. Be sure to thoroughly read the warnings and instructions on the can BEFORE you purchase a dozen cans to do the wall, and decide if you really want to do this!
I would try doing up the door to the max first, and see if this helps enough.
Jon Risch
Follow Ups:
Hi Jon,
Thanks for the info -- the thing with the door seems like what I'll be most interested in. The college might get upset if I sprayed foam into the walls. :)
Regarding the door seal -- this is unfortunately still the only way into the room -- is there a material I'll be able to use on the frame that can withstand the door itself scraping over it frequently while still providing a good seal when the door is closed?
Weather stripping type seals will be able to handle this, check out that department at the local hardware stores, try checking several different ones, they all carry slightly different brands/stuff.They have aluminum bars with a rubber cushion in the middle, rubber squegee type things, etc.
Or as suggested by the other posted reply, a large cushion or such pushed up against the door bottom. But try to go for some sort of weather stripping seal as much as possible.
Jon Risch
Will do. Thanks again.
I agree with the door air-tightening. One problem will be the space between the door and the floor.
Some doors have so-called 'planets', a tightening lip that is actuated and lowered to the floor when closing the door. But this maybe belongs to an other universe, because this is high quality building.
As alternative - if the door isn't often used (is it?), is to use a rope-like heavy cushion before the door.I would *not* foam the wall interiors! This stiffens the wall (half OK) but increases coupling of the walls strongly (bad!). And it is not revertible.
An improvement for double drywalls of same thickness, would be a doubling up of the drywall thickness on one wall (not very sensible if you intend to leave that room within the next 5 years), or fill the room in between with *soft* insulation material like some ecological paper snippets insulations, which can be blown int o hollow spaces. But probably you have to come to Europe or Switzerland to get these, hehe (the paradise is not completely rented out by america, we have our corners too...) !!
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