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sound insulating a compressor shed

mikeyr

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Sep 16, 2005
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1,971
Location
Santa Barbara, CA
This weekend I am building a compressor shed and was wondering the quietest way to finish the inside (within cost reasons).

I am building a 4x5x8tall shed for my Champion 5HP, its a big space but I figure that will help keep it from getting too hot as it will have lots of ventilation room. I also will have a small bathroom type fan near the top of the shed to exhaust the heat and cold air will be drawn from inside the garage, not the ideal cold air intake but the goal is to make is to make it as quiet as possible to the neighbors. The exhaust will **** through a few baffles in a box and I may experiment with baffled intake from the outside but I feel just drawing in the air from the garage is good enough.

The 3 walls will be built with 2x6 top and bottom plates and staggered 2x4's so the "inside wall" will not touch the "outside wall" from what I have read that will minimize vibrations and noise transmissions to the outside, I will have standard glass insulation snaked between the 2x4's, my question is what to put on the inside, I was thinking just standard drywall but is there something better ? The garage outside wall is done with those concrete siding boards (cant think of the name) and I am concerned that the compressor noise will bounce off those boards and make the thing really noisy, should I cover those with drywall as well as the 3 outside walls ?

My goal is to make what I already consider to be a very quiet compressor, near silent to the neighbors so that if I want to work late at night I can AND I wont piss them off anymore by forgetting to shut off the compressor and having it cycle at 3AM.

I installed a pocket door in the garage wall this past weekend so I can have access to the compressor from the inside and if it gets too hot in there, I can always open that door for extra cooling when its running. And I will move the intake air filter on the compressor motor since I have read that will help a lot.
 
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mikeyr

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Sep 16, 2005
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Santa Barbara, CA
ok, I got the polite hint that I should have searched :)

I like the carpet idea for the inside walls, that is the answer to my question, avoid the drywall and use carpet.

:) :)
 

Jack Olsen

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Mar 22, 2009
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Los Angeles
Box within a box is a very effective way to minimize the transmission of sound.

Some things (like styrofoam) are good for insulating temperature, but lousy for sound.

Roof liner, in multiple layers, is a cost-effective vibration dampener.

Also: add a cheap indoor/outdoor digital thermometer that records minimum and maximum temperatures. They're $10 at most hardware stores, and will give you a good snapshot of what your compressor is going through.
 

c5golfguy

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Aug 29, 2006
Messages
323
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Dallas, Jawja
I like the idea of using fiberglass resin and just putting a thin coat on the inside and outside of the box too before the carpet. The resin will significantly cut down on the transmission of sound. It's about 24 bucks for a gallon and you should be able to get what you need done with that.

Just don't put to much kicker in it.:lol_hitti:lol_hitti
 

willymakeit

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Apr 27, 2009
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Location
Springfield Mo.
If you still want to use drywall, go to a drywall supplier and ask for RC channel. This is used on sound walls between the studs and drywall. For more info go online and look at STC ratings for different types of walls. Hope this helps.
 
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ScaldedDog

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Jan 15, 2008
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Sedalia, CO/NSB, FL
Or you can caulk the studs with silicon caulk, hang OSB on them, caulk the OSB, then hang drywall on the OSB. I did that in my garage, and the compressor room inside the garage, and it worked great. You could always put carpet, egg crate material, or whatever, over the drywall.

If you go the OSB route, I'd suggest putting it on the outside, too, then whatever external covering you plan to use. You may have been planning to do that, anyway.

Mark
 

TheShrine

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Joined
Oct 27, 2008
Messages
1,168
Location
Texas Hill Country
I used OSB on both sides and double stuffed (with insulation) the walls and ceiling. I can hardly tell the compressor is even running.

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trythis

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Dec 6, 2009
Messages
348
Location
st louis
Did an unrelated project in school and talked to some audio engineers. Air transmits sound least of any thing we have handy. Its cheap too! layers of whatever with air between them. Drywall | air | drywall |air |drywall...each time, you cut the sound down. put the compressor on some plywood that sits on HVAC rubber blocks, acouple of layers of that and it wont transfer through the floor much either.

Build the wall with alternating studs that only touch one side of the drywall each.
 

mad57

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Jan 30, 2009
Messages
1,698
I tortured my neighbors with my drum playing.. still the best thing was to foam all the seems of the walls to cut vibration(more noise) then carpet padding or carpet. you could barely hear my drums /band. and we would play full bore till midnight.
 

Mickey_D

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Sep 15, 2008
Messages
106
Location
Austin, TX
I have my 5HP Champion in a 18x16 wooden shed. It is built pier and beam with a 2" plywood floor and hardipanel over 15/32" plywood, no insulation and a bunch of double pane windows. I leave the compressor on all the time feeding the air system in the front shop and you can barely hear it outside, and almost all of the noise seems to be coming through the floor and not the walls. The only sound that is clearly audible outside is the unloader valve "whoosh", I need to plumb that into a baffle. The only thing that I have done to the compressor is put the air filter onto a 2 foot pipe riser which pretty much eliminates the intake noise. I think that putting some isolators under it would kill the rest of the sound coming out.
 

Wow

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Dec 12, 2009
Messages
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You could come park it outside my house, I hate my neighbor.:bounce:

I've seen "sound deadening boards" at Home Depot in 4x8 sheets for about the price of OSB. It seem like really thick cardboard almost...never used it though...
 
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