Noise Reduction retrofit – which insulation to blow in between floors?
My four story 1880’s row house has no insulation between floors. I am unable to drop ceilings or build up floors and I don’t need total sound-proofing, but I would like to reduce noise as much as possible by drilling holes in the ceilings and packing insulation between floors. (Thermal savings is just an added plus)
Every contractor recommends a different product — Green Fiber Cellulose, Insul Safe, air krete, etc. How can I compare these apples and oranges? What should I specify in the bid to the contractor? How much less sound transmission (noise reduction) can I get?
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