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Old 2nd August 2019
  #2
Lives for gear
 

... Thought I'd add another diagram of what I was asking in the above post to show how the bottom of the inner leaf might relate to the rest of the structure.
Presumably any door in this wall would also have something like a layer of lead in the bottom 3rd to be commensurate withe the wall density down there...
Attached Thumbnails
Recording Studio / Audio Post Production Hub on level 7.-heavy-bottom-wall.jpg