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Healthy alternatives to foam or rock/glass wool
Healthy alternatives to foam or rock/glass wool
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Old 6th June 2020, 11:15 AM   #31
jamesblonde is offline jamesblonde  Italy
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Originally Posted by Pano View Post
Cotton and wool don't match or better Corning 703?
Comparing the 80mm thick wool batt which I'm looking at (in red) with 76mm thick 703 (in blue), the 703 does come out ahead above 150Hz. However, the wool measurements are using UNI EN ISO 354 whereas the 703 measurements use "ASTM C423; Mounting: Type A–Material placed against a solid backing". I have no idea whether these standards produce comparable results. This wool is only 20kg/m3 which is not particularly dense so perhaps a higher density would increase performance.


Screenshot 2020-06-06 at 12.43.46.png


I could also simply use more sheep's wool to match the performance of 703 but thin panels are much more appealing in domestic rooms. I would like my panels to be barely noticeable.

Last edited by jamesblonde; 6th June 2020 at 11:22 AM.
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Old 6th June 2020, 11:19 AM   #32
jamesblonde is offline jamesblonde  Italy
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I found this chart in "The acoustic performance of suspended ceiling systems" by George van Hout. Interesting to see how well wood fibre performs, though it sounds like a potential fire hazard (and adding flame retardant material defeats the purpose of looking for natural materials). Sheep wool comes in third:


Screenshot 2020-06-06 at 13.12.57.png

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Old 6th June 2020, 11:48 AM   #33
Pano is online now Pano  United States
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Healthy alternatives to foam or rock/glass wool
Interesting chart, thanks. Is it the cardboard that does so well?

Just looking at spec sheets I've always seen that the denim is very close to fiberglass panels and rockwool across much of the spectrum, but somewhat better in the low end. Hard to say, but it has worked well for me inside speakers. I haven't used it much on walls.
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Old 6th June 2020, 02:52 PM   #34
bentoronto is online now bentoronto  Canada
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Originally Posted by mhenschel View Post
Like the human occupants.

Manage the sound by adjusting your guest lists.
A more astute comment than you may have thought.

In designing concert halls, effort is made to select seating that has the same acoustic properties with and without patrons in the seats.


Anybody have the curve for Tectum? Really hard to get control below 200 Hz, yet that's where we need control.

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Old 6th June 2020, 04:41 PM   #36
bentoronto is online now bentoronto  Canada
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Originally Posted by mhenschel View Post
Of course, I just might be astute. ;-)
Yes, always astute.

Thanks for Tectum data. While so-so in absorption (it is just shredded wood fibers), the frequency response is flatter... and that may be a primary factor in acoustic design for a music room, not HF control. So you can use more Tectum and get better results and flatter tone compass.

Not always straightforward reading data (esp from commercial sources). While Tectum sheets may look so-so, their normal mounting is like drywall (since they are strong panels), with a few inches behind while other panels lay flat on the walls. So a 2-inch comparison may not be quite illustrative.

For sure, expensive multi-layer petrochemical foams can outperform low-tech materials. I have lined furnace ducts with that expensive stuff... esp with heavy-metal barrier layers.

BTW, Tectum is very durable (stuff I have in storage seems unlike new after 40 yrs) while petro-chemical foams may last no longer than foam surrounds on drivers, DAMHIK.

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Last edited by bentoronto; 6th June 2020 at 04:45 PM.
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Old 6th June 2020, 04:52 PM   #37
mhenschel is offline mhenschel  Canada
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LOL Astute. Yeah, that's what she said last night (or I might have misheard...)

My dad was in an AE office and when I visited the office or went on inspections as a little kid seeing Tectum in the sample room and installed in some of the buildings they designed was oddly memorable. It was a cool material. We still have some pieces kicking around the house and you're right... it's durable!

Where did you buy your Tectum? My brother was looking for some just the other day but I never had to find an outlet when my dad was working.
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Old 6th June 2020, 05:39 PM   #38
bentoronto is online now bentoronto  Canada
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....Where did you buy your Tectum?....
Can't remember, but maybe a traditional lumber yard (before you-know-who drove them out of business) and maybe on special order.
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Old 6th June 2020, 11:02 PM   #39
Pano is online now Pano  United States
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I don't remember seeing Tectum anywhere but public buildings. Never is studios or homes - has anyone? It certainly seems to work well where I've heard it.

At one time I was looking at acoustic ceiling tiles. Cheap and easy, but maybe not too effective. I built my own panels with fiberglass and was happy.
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Old 7th June 2020, 09:13 AM   #40
danny_66 is offline danny_66  Belgium
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Originally Posted by mhenschel View Post
That site has a nice comparison graph of Rockwool, melamine(Basotect), Tectum, ...

The Basotect graph corresponds with the findings of Gaga in diy-hifi-forum.eu (2nd graph)
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