I'm posting back in my own thread to help others who might be needing this information. I suspect this information would only be needed for private homes where the ceiling height is higher, and for new homeowners who like to maximise the ceiling height for floor to ceiling library shelves or wardrobe. (1) Solid wood custom-made library rolling ladders >> DesImage Tel: 6456 1636 (2) Aluminum rolling ladders >> Shan Yang Wood Products. Kim Tel: 6100 8115 I suspect this will get more and more popular because I am seeing more ladders featured in home libraries.