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Discussion Starter · #1 ·
I am finishing my basement. This is just a "general use" basement, not a media room or anything like that. But, the television in the basement will be located directly under our master bedroom. The basement ceiling will be a drop ceiling and I intend to use tiles with decent sound absorption. The joists are 2 x 10 16" OC. I am planning to put some fiberglass insulation in the joists. I realize this will be of limited value but I think it will be better than nothing. I will probably use unfaced fiberglass with the wire rods to hold them in place. Should I use R13, R19, R30 or even R38? Does the thicker insulation make enough difference in sound to make it worth the extra money?
 

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Discussion Starter · #3 ·
"No" that it's not worth the cost of the higher R values or "No", it's not worth doing at all?
 

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Fiberglass is not the best as far as sound deadening I don't think you will see much of an improvement after R-19. The R-19 will be a lot easier to get in the bays around the wires and pipes than thicker insulation also. Roxul works better but is some nasty stuff to work with. http://www.roxul.com/home
 

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OhioDon, parts is absolutely correct. I've also researched this subject and the general consensus seems to be that R-19 is the 'best you can get'. You can go higher but it becomes diminishing returns.
 

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Roxul might be around $100 more than fiberglass. Is it that much better at sound blocking?
A bunch better. I just did mine and if the basement door is shut, you can't hear whats going on upstairs if your down or downstairs if your up.

I was very impressed with the sound deadening of Roxul.

I found Roxul user friendly too. Cut it with a regular steak knife or butcher knife. Doesn't make you itch either.
 

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Great question. Is there significant difference in sound attenuation between R13 and R30 for ceilings? Based n my cursory research, I think some insulation is better than none but can't seem to find anything that thicker insulation is that much better. Thanks
 

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The vibrations that are be transmitted via the framing are the more responsible contributors for sound after the hollow cavity is insulated with either Roxul or fiberglass.

This is why staggered wall assemblies give better STC ratings.
Got it thanks. Do you think R-11 is adequate for this purpose?
 
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