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Monday, November 28, 2011

Finding Acoustic Material

Recently I was contacted by a good friend who had a dilemma; where to find ridged fiberglass (like Owens Corning 703) so he could build his own acoustic panels. Most of the excellent acoustic materials won't be found at your local Home Depot, unfortunately. so you do have to search a little. Here's an excerpt from The Studio Builder's Handbook that covers what material is available and where to find it.

Owens Corning 703 compressed Fiberglass
"Acoustic panels can be made from a few different materials, some more effective than others. The difference in materials is not only the amount of absorption, but the absorption ability at different frequencies.

Owens Corning 703
As said in the previous chapters of the book, the standard for acoustic panels is Owens Corning 703, which you won’t normally find at Home Depot (see Figure 8.7). Instead, look for a local supplier of “Industrial Insulation,” or an HVAC supplier, who should normally carry it. When asking for it at a specialty supplier, sometimes it’s called “industrial furnace insulation board.” You can also find it online at a number of places including,, and among others. 703 costs approximately $12 a panel (sometimes more and sometimes less, depending on where you buy it) and comes in packs of six. Knauf ECOSE, Johns Manville, Roxul Safe and Sound, and Certainteed are the same kind of ridged fiberglass, and can be even cheaper than their Owens Corning equivalent. Just be sure that the thickness and density is the same. Try

Handling fiberglass can irritate your skin, eyes and respiratory tract, and the dust particles are so small that they can get trapped in the lungs and become carcinogenic in some people. That’s why it’s important to always wear gloves and a mask when handling it.

Mineral Wool
Mineral wool is another mineral fiber insulation product that works as a 703 or R 13 alternative. It’s a lot less expensive than 703, and even has better absorption characteristics, but it’s difficult to work with because it’s not as rigid. Try Rockwool RWA45, RW3 or the ridged Rockboard 60, which costs about $35 for a package of 6 panels (see Figure 8.8). You may find Rockwool or mineral fiber at your local lumber supplier, or try online at, among other places.

Mineral wool is easily handled and does not cause any irritation to the skin, eyes or respiratory system like fiberglass does.

Ultratouch Cotton
Yet another alternative is Ultratouch cotton, which you might be able to find at Lowes or Home Depot. It’s about the same cost as rockwool and works almost as well, yet has none of the irritant properties of fiberglass. You can also use it in place of R 13 or R 19 in your walls. It can also be found at online.

Frames for acoustic panels can be made using 2 inch by 2 inch wood and then covering them with cloth to give them a very pleasant appearance (see Figure 8.10). This doesn’t have to be an expensive wood (pine will work), as it can be stained, covered with a wood trim or just covered with fabric.

The wood trim can be standard wall molding that can be purchased quite easily at any hardware store or big-box discount hardware store. Typically hardwood molding can be very expensive and run from $8 to $40 and up per linear foot, but try high quality pine molding, which is both affordable and looks fantastic once it’s lacquered. 

You can rent a pneumatic air hammer at your local tool and building supply company for not much money on a daily rental. If you use this nail gun with very small one inch finish nails to attach the trim to the wall panels, you’ll have a very nice look on your finished work.

Covering acoustic panels is pretty easy in that all you need is any material that easily passes audio. This can be almost anything from burlap (probably the cheapest) to even speaker grill cloth. The best way to test it is to blow into it, and if you feel your breath coming through the other side, it should work. Maybe the most expensive covering is by Guilford of Maine, but it has the advantages of being acoustically transparent and flame retardant as well as being available in a wide variety of colors. You can find it online at,,, as well as many others.

All that being said, cloth is available in many thicknesses and densities and there should be lots of local outlets in your area where you can purchase it at a discount. Sometimes it works better if you have thinner cloth that’s wrapped several times for a few more layers.

Try doing a test panel first to see how the cloth will work for you. You may find it best to use the thinner more affordable cloth even though you probably will have to take the extra time to attach multiple layers. "

To read additional book excerpts, check out the excerpts section on my website.
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Randy Coppinger said...

Be sure you use a 95 rated dust mask when working with fiberglass. Anything with a lower number will not adequately filter the tiny fiberglass particles. If you get fiberglass on your skin, use COLD water (warm water opens your pores) and soap.

Sinea said...

I am amazed at the variety of looks acoustical material comes in. Some of it can be very decorative and enhance the look of a room.

Unknown said...

Hi ! This is my first visit to your blog! Your blog provided us beneficial information to work on.
Rockwool panel

Unknown said...

If you need any advice on building a Acoustic room we are happy to help. There are PhoneStar stockists located throughout the UK and Ireland and technical support is readily available both from our own helpful team and from our soundproofing stockists.

Anonymous said...

I was looking and looking to find insulation that had ridges until I figured out what you were going for was "rigid" as in "stiff", not "ridged" as in "has ridges". Now I know what you are talking about.


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