XPost: sci.space.policy   
   From: p.black@acm.org   
      
   Pete Lynn  writes:   
      
   > "Peter Fairbrother"  wrote   
   > >   
   > > ... one atmosphere of pressure will support it.   
   > >   
   > > You could use ropes in tension to keep the roof down, if it was   
   > > only 40 feet thick.   
   >   
   > ...  It is structurally far more efficient to suspend your floors   
   > down from the ceiling, than build them up from the floor. ...   
      
   Do you mean, just on the Moon (where the weight can be used to   
   counteract air pressure on the roof) or any where, like Earth?   
      
   -paul-   
   --   
   Paul E. Black (p.black@acm.org)   
      
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