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Ed Fisher
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Joined: 05 Sep 2012
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Location: East Coast, U.S.A.
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 Posted: Sun May 04, 2014 4:17 pm Post subject: THE EMPEROR HAS NO CLOTH... |
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I'm building some window plugs and filling them with Roxul Safe'n'Sound. The outside has thin plywood, but the inside I wanted to simply cover with some material (I'm assuming that's a reasonable idea). Then it will serve "double duty" as both a plug and a sound panel. Problem is, what kind? I recall someone mentioning using Burlap. (available from Walmart) I checked it out. I have some concern about possible Roxul particle leakage because of Burlap's almost "see through" thick weave. But, my biggest problem with it is the smell. Having spent my youth on a farm I don't wish to be constantly reminded by the smell of Potato Sacks.
What materials have others had success with I wonder to cover sound panels/etc.? Is the actual material that important? I had hoped to purchase something locally, rather than order special material.
What say ye?
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SkinnyJohnny
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Joined: 12 Aug 2007
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Location: Asheville, NC
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vkuehn
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Joined: 24 Apr 2013
Posts: 688
Location: Vernon now calls Wisconsin home
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| Posted: Sun May 04, 2014 4:57 pm Post subject: Re: THE EMPEROR HAS NO CLOTH... |
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| Clutter Ash wrote: |
I'm building some window plugs and filling them with Roxul Safe'n'Sound. The outside has thin plywood, but the inside I wanted to simply cover with some material (I'm assuming that's a reasonable idea). Then it will serve "double duty" as both a plug and a sound panel.
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I read into this that you want to block incoming sound in addition to the acoustic properties on the inside.
I just completed a 'window plug'. I went for MASS. Internal frame of 2x4s laid FLAT, and both the inside and outside covered with half-inch sheet-rock. By the time I put a 2x4 down the center as well as the perimeter, there wasn't a lot of internal space left but I filled it with Roxul packed tightly. (I used it because it was available, left over from my earlier acoustic project.) I am happy with the results, but there are times when I wonder if maybe I should have added one more layer of drywall. 
Earlier I created 13 panels of various shapes and sizes 3 inches thick, spaced 2 inches away from the walls. Roxul with burlap across the front and wrapped around the sides. Most have a wooden frame around them.
There is no lingering burlap smell. (Your nose may be more sensitive than mine.) Nothing leads me to believe that Roxul is putting off anything troublesome.
Going back to the window plug: I bought a 5x6 foot "throw rug" of carpet which had a binding around the edge. I cut strips 6" wide from the edges of the rug. Tacked the strips to the edges of my plug with the bound edge facing toward the room, the studio. Wrapped it around the back side about 3/4" and cut off the excess so it would not be visible from the exterior. I cut it very close! The fit was so tight that I had to wet the carpet down with some dish detergent and use a mallet to drive it in. (I had hoped the fit would be such that I could put it in place and and take it out with regularity. For now: I ain't touching it! ) |
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petenewman
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Ed Fisher
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Joined: 05 Sep 2012
Posts: 605
Location: East Coast, U.S.A.
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| Posted: Sun May 04, 2014 5:36 pm Post subject: Re: THE EMPEROR HAS NO CLOTH... |
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| vkuehn wrote: |
I cut it very close! The fit was so tight that I had to wet the carpet down with some dish detergent and use a mallet to drive it in. (I had hoped the fit would be such that I could put it in place and and take it out with regularity. For now: I ain't touching it! ) |
I hear ya. My plugs are also very tight. I don't see me taking them "in and out" on a regular basis.
Maybe having the inside covered with cloth is not the best idea. If they hang flush, I could always cover them with sound panels I suppose. I do want them to keep the outside sound...outside. In my case, my plugs are 6 inches deep.
Note: I recently became the proud owner of a small air compressor and nail/stapler gun. Now, all I want to do is shoot nails into things.
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vkuehn
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Joined: 24 Apr 2013
Posts: 688
Location: Vernon now calls Wisconsin home
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| Posted: Sun May 04, 2014 5:43 pm Post subject: Re: THE EMPEROR HAS NO CLOTH... |
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[quote="Clutter Ash"] | vkuehn wrote: |
Note: I recently became the proud owner of a small air compressor and nail/stapler gun. Now, all I want to do is shoot nails into things.
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In my case, the project was very depressing. I don't plan to do any more projects in the near future. When I couldn't find my power nailer/stapler, I ended with tacks and a tack-hammer on the carpet seal. Very depressing not to have a noisy power tool in the mix!  |
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Ed Fisher
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Location: East Coast, U.S.A.
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| Posted: Sun May 04, 2014 5:50 pm Post subject: |
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I'm now convinced that hammers are the Devil's playthings.
If I can avoid it, I shall never use another one. 
Also Pete and John. Thanks for the fabric info. Good stuff.
Imagine the ladies at the fabric store watching me tomorrow as I "blow" on various fabric. One can only imagine what they will be thinking.
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georgethetech
The Gates of Troy
Joined: 18 Mar 2007
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Location: Topanga, CA
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| Posted: Sun May 04, 2014 6:07 pm Post subject: |
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If this is for isolation, why would you want the fabric to pass sound through it? Just use some cheap tack or jersey knit.
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Ed Fisher
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Location: East Coast, U.S.A.
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| Posted: Sun May 04, 2014 10:34 pm Post subject: |
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Hmmm.
I had it in mind that it would not only keep out outside sound, but also act as a sound board for the interior. Are these exclusive functions?
I realized that with a wooden interior I would still have hard surface reflection. (which I have too much of anyway)
But, maybe asking a window plug to do both is unrealistic. If using a cloth interior will make the window plug less effective on keeping out sound, then probably the way to go is to make it solid on both ends. I suppose that sounds like a reasonable assumption. Being that more mass is preferred for sound isolation.
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chrisvoco
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Joined: 14 Mar 2014
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| Posted: Sun May 04, 2014 11:07 pm Post subject: |
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Clutter, what you get when you use breathable fabric is a bass trap, which acts more like a black hole for low-mid and low frequencies, not a window plug. I mean to say here that you should keep the breathable fabric, if you already picked up some, to use as a (hopefully fashionable!) covering for any traps you build with leftover framing and roxul (just don't get carried away and put plywood faces on it!).
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georgethetech
The Gates of Troy
Joined: 18 Mar 2007
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Location: Topanga, CA
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| Posted: Mon May 05, 2014 12:21 am Post subject: |
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Unless this window plug has multiple substrates, it can only really effectively either act as absorption or isolation. You can have a dense layer that's air tight to the window frame, and a soft layer to reduce echo.
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If it sounds good, it is good.
George Whittam
GeorgeThe.Tech
424-226-8528
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TheProAudioSuite.com Co-host
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