First post, ...ever - although not about GTG. As I am finally beginning my theater, looking for value sources and found one.
I wanted to make our community aware of a local source of OC705 material via Craigslist that is normally (surprisingly for me) pricey. Search terms are insulation, Middleburg. No connection w/ seller, satisfied buyer.
He is selling Owens Corning Acoustical/Insulation Rigid Fiberglass Board. This product is unfaced (plain), asserted to be OC705, but do not think he knows. Panels are 3'10"W x 10'L x 1"thick, $10/board ~40 sqft. While he is located in Middleburg, he delivered (unwieldy size) to my home (Fairfax) on weekend - very accommodating. He has 120 boards remaining.
Material is similar to OC703 w/r to sound absorption, but denser. Ref: Bobgolds absorption coefficients website http://www.bobgolds.com/AbsorptionCoefficients.htm
. NB: Website value for 705 1" unfaced at 125Hz seems inconsistent on this otherwise tremendous webpage. OC703 goes for ~$46 + SH for 2'x4'x1" x 6 panels (48 sqft) at Acoustimac, more expensive elsewhere. Linacoustic is reported to be $190 for 4'x100'x1" roll (McCormick's Insulation in Manassas - Thanks BigMouthinDC/Jeff!!!).
Material looks a little rough, but OK shape for what we use it for. Seller provided 20% extra to accommodate dings, etc. Will be careful to use mask/gloves as panel was friable. Heavier/stiffer than anticipated.
Ordered extra, got even more. Will give away excess after done in hopefully not too distant future. Now have to determine how to use it. HTH
Phased Adaptive Approach Theater (tentative)