I'm building a new home and I have the chance to insulate the ceiling joists below my 3rd floor media room with R19 (DIY). However, there is an open U-shaped stair case that goes from the 3rd to the 2nd floor with no door. Is it worth insulating the 2nd floor ceiling or is it pointless since so much noise will come down the stairway? I realize most will say just do it because its cheap, but with 2 little kids my time is limited these days. Thanks for any input or opinions.