Standard door construction results in a gap between the door jamb (part of the door assembly immediately around the door when closed) and the adjacent framing member. This gap is normally covered up by moulding on both sides, forming a traditional looking door casing. This is good for making a door assembly free from settling issues. But it is not good at all for acoustics. Sound vibrates the moulding on one side, and air inside the gap transfers the sound to the moulding on the other side, with very little attenuation. You almost wonder whether the unstated function of a traditional door is to ALLOW the transmission of sound, so you can hear your kids screaming, etc.
Sound Isolation Company suggests running the drywall all the way up to the door casing. Carpenters are somewhat reluctatnt to do that, for various reasons. But my new builder Tom has agreed to give me some time between the installation of the doors and the final moulding, to allow me to stuff the gaps with sound absorbing material.
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