We have a 13 year old learning to sing, and that's just say sometimes, it gets a bit off-key. I was thinking that by replacing the door with a solid door, it will help sound-proof the room. I noticed that the solid core doors listed in Bunnings are called External doors, however they are the same dimensions?
EG: Hume 2040 x 820 x 35
Is there any reason why External doors can't be used?
solid timber door. Put some seals all around