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Mineral Wool vs Fiberglass

Posted By: Dave B
Friday, 15 December 2000, at 10:45 p.m.

I own a 1930s duplex and live on the second floor. Currently the only insulation in the attic is the original newspaper strips stapled to the tops of the 2x6 ceiling joist. I want to bring the attic insulation up to R45 and have decided to hire an insulation contractor to blow in either mineral wool, or fiberglass. I live under the flight path of the Minneapolis airport, so noise is a consideration. I have 3 questions: 1) I have heard that mineral wool (or rock wool) is denser than fiberglass and is therefore a better sound insulator. Is this true? Will I notice any difference in sound reduction with mineral wool vs. fiberglass? 2) What should I do with the existing newspaper insulation? Should I just leave it in place and low the insulation over the top, remove it, or cut it and push it down to the bottom of the joist cavity? 3) When the people living in the first floor apartment turn up their TV or stereo, it is quite noisy on the second floor in the room directly above the TV and stereo. Will blowing in mineral wool or fiberglass into the 2x10 joist space over the room with the TV and stereo significantly cut down on the noise? Would my money be better spent by installing a system of flexible channels and 5/8 sheet rock over the existing first floor ceiling? Should I do both? Will mineral wool vs. fiberglass make a difference in noise reduction?

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