Insulation would be the way to go if your family is ripping out the floor above. You'd have to remove the subfloor to get access but if you're redoing those floors anyway it's cheaper then ripping apart the ceiling below and putting it in that way.
Spray foam would be the easiest since only small holes would need to be cut and patched in the subfloor but it would be more expensive. You can use acoustical insulation like recommended above but something like roxul is a bit of an overkill (cost wise) as you're paying for the sound and fire protection when all you really need is sound.
If you go the bat insulation route check out some of the building contractor supply places as they may be cheaper but shop around. Dryco, Kenroc, Pacific West and a bunch of others all carry what you need. http://www.dryco.ca/ http://www.slegglumber.com/ http://www.kenroc.com/
The world ain't all sunshine and rainbows. It's a very mean and nasty place... and I donīt care how tough you are, it will beat you to your knees and keep you there permanently, if you let it. You, me or nobody, is gonna hit as hard as life. But ain't about how hard you hit... It's about how hard you can get hit, and keep moving forward... how much you can take, and keep moving forward. Thatīs how winning is done. Now, if you know what you worth, go out and get what you worth. - Rocky Balboa
Last edited by quasi; 01-02-2009 at 07:09 AM.