soundproofing

[RICK FITZPATRICK]

Wouldn't it sag over time if you simply wrapped it in fabric and hung it

Why do you think they call it RIGID fiberglass? Have you ever seen it? Although, I'm thinking of 4". 1"-2" could possibly sag if not hung with that in mind, but...I've NEVER heard anyone complain

 

[Shout It Out]

yea I'm going frameless. One less thign to worry about and less weight on the walls.

 

[SonicClang]

Rick, it may be rigid compared to standard insulation, which is flimsy by design, but drywall, OSB, and MDF are "ridig" and they sag over time if you don't support them right.

It's just a question, and not a stupid one at that, so I'd appreciate a little less condescension. And try not to get so worked up over every little question.

 

[RICK FITZPATRICK]

It's just a question, and not a stupid one at that, so I'd appreciate a little less condescension. And try not to get so worked up over every little question.

Hey Sonic, MDF, OSB and other sheet goods are HEAVY. Rigid fiberglass, especially more the 2" thick has very little weight vs stiffness.



And btw, who got worked up Sonic? And condencending? I think you''re interpretation of my reply is a bit mistaken. Thats NOT what my intention was nor do I think I came across that way. But if I did, to anyone I offended, please accept my apology. You are right about questions, but lets look at the facts. Someone starts spoutin terms like RFZ, and you'd think they AT LEAST understand what and how Rigid Fiberglass absorption works. But, maybe not. In that case...well, what can I say other than...EXCUUUUUUUSE ME!

 

[Innovations]

I've always been under the impression that the frames are to help the fiberglass keep its shape. Wouldn't it sag over time if you simply wrapped it in fabric and hung it? Not neccessarily the ones that are vertical, but the ones hung at a 45 at the wall to ceiling corners.

Not really, the 45 degree wall to ceiling hanging is a trick frame or not
Frames get you a crisp edge and an easy way to hang them like a picture. There are also various esthetic possibilities.

 

[HapiCmpur]

Not really, the 45 degree wall to ceiling hanging is a trick frame or not
Frames get you a crisp edge and an easy way to hang them like a picture.

Right. Unframed panels can be pretty hard to hang in ways that don't damage the fiberglass, especially if you're trying to leave space between your panels and the wall.

Also, framed panels are easier to move around without doing damage to the fiberglass. I've got some unframed panels hanging from the ceiling, for instance, and each time I take them down to clean them they get just a little bit more crushed up around the edges. It's a very slow deterioration, mind you (since I don't clean the studio as often as I should), but it's worth noting that my unframed panels are wearing out faster than my framed panels.

 

[RICK FITZPATRICK]

Hey Guys, HE was complaining about building frames. I gave him an alternative since he THOUGHT a frame was REQUIRED to work. Last time I'll do that.

 

[Shout It Out]

So frames are good. Rock on. Frames it is.

 

[RICK FITZPATRICK]

So frames are good.

That depends on your point of view. Here is mine. A 4" thick 2'x4' panel of OC 703 has 288 square inches of exposed edge. That amounts to TWO SQUARE FEET of absorption area PER PANEL, or 1/4 of the face. In other words, put a frame on and you cover 2 sq ft of potential absorption area at incident angle. If you have 8 panels, thats TWO full panels of edge area. Now, I don't know about you but for absorbing direct or reflection at grazing angles, I can't afford to throw it away... BTW, a 4" thick, ONE FOOT SQ, panel has 192 square inchs of edge. The face only has...144. Now go build your frames.

 

[Shout It Out]

hadn't thought of it that way...good thinkin'

 

[pandamonk]

Like hapicmpur, if you're gonna build frames, which might be the better idea, drill holes in them. This, i'm guessing, causes a helmholtz resonator effect. If not, it still leaves some of the edges open to absorb.

 

[studiomaster]

Like hapicmpur, if you're gonna build frames, which might be the better idea, drill holes in them. This, i'm guessing, causes a helmholtz resonator effect. If not, it still leaves some of the edges open to absorb.

Good point.

 

[Shout It Out]

what I am doing is using peg board for the frames, so they do have holes in them. and they are very lightweight.

 

[pandamonk]

Drilling holes will take ages and you will wish you didn't half way through, so it thought of a new way. Get 1"x1" wood and build like the attached pic. Thats wot I'm gonna do.

 

[studiomaster]

What kind of wood should be used?

 

[Shout It Out]

I guess when i go to the store tomorrow im just gonna buy wooden dowels but recangular ones...seems liek that is what pandamonk is going for. also..a i need opinions and help on this...

The bass trap will be above that book case, but what i want to know is if the bookcase is doing me any good. I put it there and filled it with blankets and such to kinda angle the room instead of having a corner...is this a good idea? also thats big green wall behind my desk is a 7 foot wide wood board with carpet nailed over it and covered in a sheet. Is this bad for the room or is it ok? people say that carpet unbalances the room or something... I think it was a good idea to do, but opinions would rock.

 

[pandamonk]

What kind of wood should be used?

Anything really, i'm guessing. Just go for something cheap. I'll leave this for someone else 'cause it almost 2am and i need my sleep night

 

[antispatula]

Why would you cover the very thing that you want to ABSORB sound I think you better do some reading about RESISTANCE ABSORBERS before you make some decisions.

http://searcht.netscape.com/ns/boom..._url=http://www.ethanwiner.com/acoustics.html

Haha I think I should! That idea has always confused me. In the Home recording for dummies book he said to use 1/8"-1/4" plywood, depending on the freqs you wanted to absorb.

 

[Shout It Out]

I jsut want to be safe and ask this question...the net recommends burlap for bass traps and absorbers....what I want to know is if i can use the standard household cotton bedsheet for the fabric over the 703? Dumb question maybe, but i need to know if it is breathable enough...

 

[Innovations]

The only reason to do frames is for the crisp edge. If a slightly softer edge is fine then unframed saves time, expense and weight.

The prefered mounting for unframed panels in 'impaling clips'.

http://www.acousticalsolutions.com/products/hardware/impaling_clips.asp

While theoreticall these are 'damaging' the fiberglass the actual effect is miniscule. If you want your panels to have an air gap behind them then mount 2x4s to the wall and then screw the impaling clip to the 2x4s

Covering Fabric
The choice of covering fabric only requires that the fabric be permeable. In other words put it across your mouth and try to blow through it. You should get near zero resistance. I don't think that a high thread count sheet would pass this test. My personal choice is usually felt. It is cheap and in a wide variety of colors. Ideally you should treat it with flameproofing afterward.