AVS Special Member
Join Date: Mar 2008
Location: California, Bay Area
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Thanks Ted, yes this is an unusual starting space for a theater build but I was determined :-) The excavation is done and it is quite amazing what the removal of well over 100 yards of dirt from under the house looks like!
Back on the isolation question. From what I understand, the air gap will form a spring between the mass of the theater room wall and the concrete foundation -- the larger the gap the better the low frequency isolation. But, given that the air gap in the upper part of the wall is larger and it continues into the space between the theater rooms separate ceiling and the joists of the floor above, is a 1" separation sufficient or do I have to make it larger (4" seems to be the rule of thumb). Note that the whole purpose of going to the effort of building this retofit basement is isolation from the house so I want to make sure I'm getting this part of the design correct.
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My 8 year old daughter: "are contractors the people that mess up your house for money?"