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?
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
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.
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
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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