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Old 1st December 2009, 06:32 PM   #6
avare
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Join Date: May 2004
Location: Hamilton, On Canada
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Excellent summary of the task Dan in the post above.

Isolation of the wall/ceiling from the floor if a separate base for the walls is not feasable can be achieved with PROPERLY SPEC'ED rubber or other resilent material like sylomer. The laod and deflection have to be calculateed for the material. Otherwise it is a waste of money.

A floating floor has to have resonances (yes plural) below the frequencies where isoaltion is required. Everyone seems to remember the weight/spring resonance and then forgets the (acoustically obvious) MAM resonance of the floor!

I would first investigate the fotfall noise in greater detail. As you wrote, it is probably not coming through the concrete floor.

Andre
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