How to sound proof a door for a split level house hack?

[Jeff Cua]

Good evening BP! Just curious  if any of you know any good ways to sound proof a common door that enters down to the inlaw/basement where we will be house hacking for a year? We plan to set up a hotel style double door with deadbolts for security but would be nice to have some sound proofing? Do you guys have any input? Thanks!

[Bruce Woodruff]

If you don't care if this door works.....then do what I do.....put R-19 insulation in the space between the door and screw in a piece of 3/4" plywood on the inside door. Decorate it if you want to.....