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Old 19th July 2010
  #6
Gear Maniac
 
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FRK with multiple 703 or 705

Owens Corning 705 FRK [oc705 FRK] - $139.99 : Ready Acoustics!, Hear - Sound - Better

According to this website:
Foil faces the room
only the front layer has foil if you are using more than one OC703 or 705 batt (e.g. 2 x 4 x 2")