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Post by Hexspa on Aug 17, 2021 6:52:54 GMT
Well time, inflation, and regional pricing differences stop for no one. I guess it's virtually laughable that I was able to acquire #8, 2" mineral wool at $0.63/ft2 12 years ago. Because of this, I thought I'd make a thread for posting current prices for various materials. If you see a sale, let us know.
4-8lb 4" mineral wool seems to be going for about $2.35/ft2 currently; a four-fold increase from what I paid. Yes, I'm suffering sticker shock.
Anybody finding it for about a buck?
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Post by rock on Aug 17, 2021 23:30:59 GMT
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Post by rock on Aug 18, 2021 13:14:54 GMT
Oh, I just noticed I calculated price for cubic feet but Hexspa's prices were in square feet were you will need to consider different thicknesses. I suggest using cubic because it takes different thicknesses into account for price comparison purposes.
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Post by Hexspa on Aug 18, 2021 16:13:38 GMT
Is that a semi-fluffy batt? You make a good point about cubic feet. I kind of have when comparing, say, 4" vs 2" rigid insulation. Pretty much, I boil it down to how many 4"-thick panels I need. My goal is to start making 8" rigid panels and put them on wheels.
I emailed the supplier - I don't want to promote competing acoustics businesses - and they actually have IIG 1280 for about $2.62/ft2 at 4". That was surprising because that's what I already use. This material also seems to be the best price. At 4", you get a 1.0 or so absorption coefficient at 125Hz.
The thing is I just blew money on something else so I have to wait again. What I was going to do is just get like 400ft2 and make a ton of panels. My new strategy will probably be to just build 3-6 panels at a time.
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Post by rock on Aug 18, 2021 20:09:45 GMT
I think it would be considered a rigid batt because each batt should weigh 10.8 pounds according the specs on the Menards product web page where the net total weight for 5 batts is 54.24 pounds. These batts are 5.5 inches thick which is the depth you might find in the "floor" of an attic space but they are 23" wide for joists spaced O.C. 24" apart.
Anyway, I really didn't search that hard so if I were in the market to buy, I'd do a more thorough search.
Moveable panels are very handy! Go For It!
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Post by Hexspa on Aug 19, 2021 4:55:32 GMT
The terms are confusing, I've found. What I refer to rigid is the kind that doesn't sag at all. Examples include OC 70X series and the kind of rigid mineral wool I'm using. However, the insulation industry also refers to semi-rigid batts as rigid. For instance, I think Safe n' Sound is considered a rigid batt. If not that one, I'm pretty sure I've seen semi-fluffy batts called 'rigid'. My rule of thumb is that, if you can buy it in a hardware/big box store then it isn't rigid enough  Thanks for your help, rock. |
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Post by rock on Aug 20, 2021 1:56:45 GMT
Sometimes I think we get a little too far in the weeds... But I can't help it either . I think "rigid" is just a by product of density when it comes to mineral wool and fiberglass. Acoustically is rigidity even a factor? Even density? Isn't it gas permeability what were really supposed to be looking at? But wait a second, lets back up. Honestly, I'm at a point where "good enough" is good enough. I mean, what do I expect from my investment? And how much do I want to invest? But that's just me everyone has their own goals and that's what were here for. If I were back in the days when I was building a studios, I would die for all the info we have at our fingertips today. For any one building a studio today, this is Nirvana! But back to rigid. I think most rigid Mineral wool will sag a little; it just depends how much. The frameless 4" thick clouds I made are suspended using a hardware cloth (heavy screen) section 12" x 18" at each end centered at the 1 foot and 3 foot points on the bottom (behind the black cloth). The four suspension wires attach at points where the sag is equal on both virtual ends and a fastened to the rods you can see near the ceiling (there are really two but you can only see one in the pict). The batt would sag without the support of the screen but not as much as if it were less rigid. The ones you see in the half frames only support are on the bottom half. BTW, I'm thinking about filling in the space below them to the floor, they were originally intended for moveable RFZ or vocal mic use but filling them in will be a little better for amps and drums. I also should have cut holes or slots in the frame...maybe later. Cheers, Rock  |
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Post by Hexspa on Aug 24, 2021 10:22:15 GMT
Yes, GFR is definitely the key metric for effectiveness. I only mention sagging since Ethan did. He said something about mineral wool sagging but I haven't had that issue. I've had these panels over 10 years now, granted I've moved a few times, but they're sturdy. For reasons you mentioned, like moving them around like baffles, rigidity has value. Those are super nice supports. We're thinking to use hardware shelves. If we end up building these 8" ones, they're going to be heavier than I feel comfortable hanging. Maybe it can be a race - I bet I'll build my panels before you fill yours in |
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Post by rock on Aug 24, 2021 12:45:52 GMT
I only have 3 of those stands so I would guess I have the advantage...even so, I'll bet you'll still finish yours first I've got an ongoing project painting exterior window frames around the house.  But that's just an excuse, you'd probably still finish first...but you never know ha ha ha. |
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Post by Hexspa on Aug 25, 2021 7:12:11 GMT
Hopefully going to pick everything up next week.
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But that's just an excuse, you'd probably still finish first...but you never know ha ha ha.