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