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R/E/P => R/E/P Archives => Acoustics in Motion => Topic started by: Bill_Urick on January 04, 2009, 10:24:20 pm

Title: 8, 9, 10, got a question again...
Post by: Bill_Urick on January 04, 2009, 10:24:20 pm
Eight feet or so, floor to ceiling. (8)
Another foot to the bottom of the joists. (9)
Eleven inches from the bottom of the joists to the sub-floor above. (10)

1" or 2" 703 in the ceiling grid?
It seems that 2" would be better but how much better?
Title: Re: 8, 9, 10, got a question again...
Post by: Ethan Winer on January 05, 2009, 02:25:53 pm
Bill_Urick wrote on Sun, 04 January 2009 22:24

1" or 2" 703 in the ceiling grid? It seems that 2" would be better but how much better?


Thick rigid fiberglass doesn't absorb "more" than thinner. Rather, it absorbs to a lower frequency. So thicker is always better. In this case, the very best thing you can do is pack the space between the joists completely with 12-inch thick R38 fluffy fberglass. Then you can get away with thinner rigid fiberglass in the grid, and you'll also have substantial bass trapping. Wall-ceiling corners are just as useful for traps as any other corners, so you could use 4-inch thick 703 in the grid around the perimeter for even more bass trapping.

--Ethan
Title: Re: 8, 9, 10, got a question again...
Post by: Bill_Urick on January 06, 2009, 07:11:18 am
Ethan, you're always there with an answer.
Even helping out with DIY projects that run counter to your self-interest.
Thank you.
I hope you, Mrs. Winer and Bear all have a great year!  
Title: Re: 8, 9, 10, got a question again...
Post by: Ethan Winer on January 06, 2009, 12:18:27 pm
Thanks Bill. The year is great so far, but who knows what good or bad is yet to come. Laughing