11. Fill it with unbacked fiberglass insulation, then attach sound-absorbing board to the studs. 12. Put in six-inch-thick fiberglass, either unbacked or with a paper backing. 13. Unbacked " paper " ( wanted by the Greenbacks ) represented a third option.14. Dragging unbacked fiberglass on top of insulation already there is tough; it tends to stick together. 15. In this day of unbacked currency and electronic balances, the whole concept requires a leap of collective faith. 16. The real bills doctrine asserts that it is an illusion that any physically inconvertible currency is necessarily also unbacked . 17. Holbrooke was convinced by the successful NATO bombing of Bosnia in 1995 that Balkan diplomacy unbacked by force amounts to dithering. 18. Fill it with unbacked fiberglass insulation and face it with sound-absorbing board, a common item sold at lumber stores. 19. Issuing unbacked paper money was not an idea Lincoln really liked, but soon there was mounting pressure in Congress to do something. 20. In either case, now you can put 6-inch unbacked fiberglass on top of the insulation at right angles to the joists.
