Are you saying that you don't think the Dacron is necessary to contain the fibers and that the fabric will adequately do the job of containing fibers on its own? So that price isn't too bad.Īssuming that the Dacron is completely acoustically transparent, and speaking purely for myself, something like Dacron might still provide some additional containment of the fibers in the pink fluffy/SnS above it better than just fabric. It looks like it would cost about $100 to buy all of the Dacron that I'd need. Edit: I saw your subsequent post with a link to the polyester you used. I'm also worried about what Dacron might cost. Where did you get Dacron? I've seen that name pop up here and there in some of these threads. What is the GFR of Dacron? Is it so low to essentially be acoustically transparent?Ģ. So that's where the idea to use acoustically transparent (or so I thought) ceiling tiles such as Stratotile, which I thought to be well suited for these purposes based on recommendations (Wes Lachot, no less) I'd read in various threads, entered into consideration.īut if fabric is going to acoustically perform better than ceiling tiles, I'll likely just stick with fabric and figure out another way to keep the fibers better in place, possible with something like your Dacron solution.ġ. Basically I was just wanting something that would do a better job of holding the fibers in place, compared to the job I imagined fabric of being capable of doing. Yeah, this is more or less along the lines of what I was thinking about doing. I think this is pretty much what you were describing in post 12 but bearing in mind what Kyle explained in post 33.That looks good. I'm in the middle of reading that BBC paper now. Guilford is so damn expensive, so I could get into the idea of buying cheaper fabric and just spraying it. That's why I'm using SnS (10,000 rayl) for my 9" traps and pink fluffy (5,000 rayl) for my 12" or deeper traps. That's too bad, but I accept that this is the case. Most likely no issue in non-direct reflection points.So it's sounding like there isn't actually a truly acoustically transparent ceiling tile of any kind, compared to the acoustical transparency of fabric. If you look at the BBC paper you can observe the effect of plastic. I think this is pretty much what you were describing in post 12 but bearing in mind what Kyle explained in post 33.Nice looking, effective, and low cost. I think this is pretty much what you were describing in post 12 but bearing in mind what Kyle explained in post 33.and Starlight saves the day I think this is pretty much what you were describing in post 12 but bearing in mind what Kyle explained in post 33. This will be the barrier layer that stops fibres escaping while keeping the finished tile breathable.Ĭonfident it works, I then took it down and stapled my choice of breathable fabric (grey) to the underside of the frame, as shown in the other photo. You can see where I put my test tile in place to check it could bear the weight of the lightweight, low density insulation above it. Next was a piece of polyester filling, aka Dacron, (white in the photo), a very low GFR breathable product. I made square wooden frames just a fraction smaller than the full size required, with a cross strut that probably was not necessary.Ĭhicken wire was stapled to the top of the frame to prevent what will be above the tile from pushing through and making each tile sag in the middle. Maybe you will see something that sparks an idea on how to solve your problem. Quint, let me show you how I made my own tiles. Most likely no issue in non-direct reflection points. Fire treatment spray is available and relatively low cost. Your traps are fairly deep, so you want low density/GFR. There's an optimal thickness per density/GFR for particular frequencies. You'd absorb less water at any given instance with the layered approach. The acoustic tile is akin to putting very dense sponge on top of a thick soft one. I'm just trying to understand why this is the case? What is it about the fabric scenario that makes it perform better than the ceiling tile scenario?It's a more optimal acoustic impedance. So I'm not disagreeing with what you're saying. The calculator agrees with what you're saying. I get results in the calculator that support the notion that pink fluffy/SnS covered by fabric is better (more absorbent in the low end) than pink fluffy/SnS covered by a ceiling tile like the Stratotile. Ceiling tile scenario (1" of 30,000 rayl OC705/16,000 rayl OC703 type of ceiling tile) Fabric scenario (no additional layer plugged into the calculator below the pink fluffy/SnS layer because the fabric is viewed as acoustically non-existent)Ģ. Why would the fabric be better than the ceiling tile?īased on what I've plugged into the Porous Absorber Calculator:ġ.
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