giraffe
i love negative rep
i'm trying to make this a one stop shop for fiberglass info, because wadeing through this crap sucks
feel free to add, but let's keep it as information heavy as possible.
http://www.ethanwiner.com/acoustics.html
http://www.fibrexinsulations.com/pd...nuationFire.pdf
(once more for thoes links, so they don't get lost as a part of the overall quote.)
feel free to add, but let's keep it as information heavy as possible.
Diffusion said:http://www.bobgolds.com/AbsorptionCoefficients.htm
Here you will find NRC ratings for just about any insulation or absorbtion product on the market... shows ratings for each thickness... thought this might help a few people out...
pandamonk said:Here is a list of Knauf coefficients i just got off the company
Absorption co - efficients - S = Solid Backing - C = Cavity
Rocksilk Slabs
Thickness RS33
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
40S 0.16 0.45 0.82 1.00 1.00 1.00 0.82
50S 0.10 0.60 0.90 1.00 1.00 1.00 0.88
60S 0.22 0.75 1.00 1.00 1.00 1.00 0.94
75S 0.24 0.53 0.89 0.94 0.96 0.98 0.83
100S 0.39 1.00 1.00 1.00 1.00 1.00 1.00
Thickness RS45
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
25S 0.05 0.25 0.55 0.75 0.9 1.00 0.61
40S 0.14 0.40 0.87 1.00 1.00 1.00 0.82
50S 0.25 0.65 1.05 1.10 1.05 0.95 0.96
75S 0.50 1.05 1.20 1.15 1.10 0.95 1.13
100S 0.80 1.15 1.20 1.15 1.15 1.00 1.16
50C 0.45 0.95 0.80 0.95 0.95 1.00 0.91
Thickness RS60
25S 0.10 0.20 0.65 0.85 1.00 0.90 0.68
40S 0.13 0.49 0.95 1.00 1.00 1.00 0.86
50S 0.25 0.65 1.05 1.10 1.10 0.95 0.98
75S 0.55 1.10 1.20 1.15 1.15 1.05 1.15
50C 0.45 0.90 0.80 0.90 0.95 0.95 0.89
Thickness RS80
25S 0.06 0.23 0.56 0.88 1.00 1.00 0.67
40S 0.14 0.61 1.00 1.00 1.00 1.00 0.90
50S 0.16 0.72 1.00 1.00 1.00 1.00 0.93
60S 0.25 0.90 1.00 1.00 1.00 1.00 0.98
75S 0.39 1.00 1.00 1.00 1.00 1.00 1.00
100S 0.59 1.00 1.00 1.00 1.00 1.00 1.00
Thickness RS100
25S 0.05 0.30 0.70 0.95 1.05 1.00 0.75
40S 0.12 0.44 0.88 1.00 1.00 1.00 0.83
50S 0.35 0.85 1.10 1.10 1.15 1.10 1.05
75S 0.44 1.00 1.00 1.00 1.00 1.00 1.00
50C 0.65 0.95 0.80 0.90 0.95 1.00 0.90
Thickness RS128
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
50S 0.40 0.90 1.00 1.00 1.00 0.95 0.98
50C 0.65 0.80 0.85 0.95 0.95 1.00 0.89
Thickness RS140
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
50S 0.40 0.90 1.15 1.05 1.10 0.95 1.05
50C 0.65 0.80 0.85 0.95 0.95 1.00 0.89
Thickness RS200
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
50S 0.40 0.50 0.70 0.70 0.70 0.70 0.65
Rocksil Insulation Mat
Thickness
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
150 0.70 1.20 1.24 1.13 1.14 1.18 1.18
100 0.40 0.88 1.03 0.99 1.06 1.11 0.99
80 0.31 0.83 0.96 0.98 1.04 1.14 0.95
60 0.25 0.60 0.83 0.89 0.96 1.04 0.82
Rocksil Studio Mattress
Thickness
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz NRC
50S 0.25 0.65 1.05 1.10 1.05 0.95 0.96
50C 0.45 0.95 0.80 0.95 0.95 1.00 0.91
S= Solid Backing - C = cavity
reshp1 said:Well as promised here it is....
Please post places that you know of to get rigid fiberglass, rockwool, mineral etc and the location of that distributer. If this thread gets big enough to be helpful, I'll try to get Dragon to sticky it for us.
I'll start
Detroit MI area,
Insulation Sales
Ferndale, MI
248-398-7200
"They carry Owens Corning 703 Unfaced, FRK (foil) faced and ASJ (white) faced in the 1", 1-1/2" and 2" varities." (thanks AjD)
Aurora IL
Amerisafe
http://www.amerisafe.net/store/item.asp?ITEM_ID=712&DEPARTMENT_ID=152
Sells all sorts of fiberboard by Knauf (Owens Corning competitor)
NOTE: The website pricing is PER SQ FT, and they do ship via UPS anywhere in the U.S.
Someone posted a map of locations for a national chain that sells rigid fiberglass that I can't seem to find right now, but if someone has a copy please post that up.
knightfly said:
HapiCmpur said:Got my Johns Manville 817 from McCormick Insulation Supply, Inc.
http://www.mccormickinsulation.com/
They've got a bunch of locations scattered across Maryland and Virginia. They were helpful, cheerful, and highly professional -- and that did not change when I told them I only wanted two packages of material.
Milkman said:I got some helpful information in a thread I started looking for some OC 703 or equivalent product in Canada.
Ottawa Fibre products, specifically the OFI-48 and OFI-64 (http://www.ofigroup.com/) are supposed to be extremely similar to the OC 700 series.
These OFI products are available through ISOFAB at several locations:
http://www.glasscellisofab.com/contact_us.htm
fraserhutch said:Paragon Pacific Insulation
(253) 872-0800
19710 58th pl S
Kent, WA 98032
rpe said:In the El Paso, Texas area:
http://www.selleinsulation.com/El Paso/default.asp
Got my OC 703 for $1.63 a sq ft. and they'll sell any amount (large or small).
rpe
tapestry said:For Atlanta:
The sheet is 2'x4'x2" and sells for $1.18 / square foot.
3287 Marjan Drive
Atlanta, Georgia 30340
770-454-9643
770-452-8637 FAX
800-633-5198
atlanta@spi-co.com
savageblues said:Just thought it might be of interest to someone, somewhere...
A good friend of mine works for Patene's which is a building suppy company here in Ontario. They dont rep Owens Corning, but they carry what he thinks is a similar product Roxul RXL40. A semi-rigid insulation which comes in 24x48" pieces of thickness 2, 3 or 4". Apparently their min. order would be one bag which contains 64, 48, or 32 sq.ft respectively. This is what I plan to buy when Im ready.
Scottgman said:I'm glad we've got the new guy here to straighten us all out on that issue!
Seriously, I'm no expert, but the data clearly shows that rigid fiberglass and rockwool do a pretty darn good job absorbing down to the 125 to 150hz range. I'm not sure what you consider the "low mid and bass range," but rigid fiberglass clearly does more than "reduce the reflection of upper midrange and high frequencies." Sounds like you are describing the performance of foam.
On Ethan's site, he explains: "705-FRK that is four inches thick and spaced 16 inches away from the wall can be quite effective to frequencies below 125 Hz." He also has data showing that higher density provides better absorption at the lower frequencies.
Check out Table 1 on Ethan's site (it lists absoprtion coefficients):
http://www.ethanwiner.com/acoustics.html
Check out Page 2 on this website for rock wool absorption coefficients:
http://www.fibrexinsulations.com/pdf/SoundAttenuationFire.pdf
I do believe that sealed bass traps like those described (and manufactured) by Ethan provide absorption below 150hz, but stating that rigid fiberglass panels only absorb the upper-mid and high frequencies is just plain wrong.
http://www.ethanwiner.com/acoustics.html
http://www.fibrexinsulations.com/pd...nuationFire.pdf
(once more for thoes links, so they don't get lost as a part of the overall quote.)
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