PERIOD HARDWARE ON CHARLES Street in Boston

Find modern barn door hardware at http://my.diytrade.com/diyep/siteMain/product/productTable?page=product/productTable

or contact joekiko2009@hotmail.com

unless you want the door 'flapping' it would be necessary. I would definitely use it to avoid wall damage etc.

Yes, it's preferable to guide the door at the bottom to keep it from swinging away from the wall. There are a number of different ways you can accomplish that. We prefer T-Guides which ride in a groove in the bottom of the door:
http://www.realslidinghardware.com/t-guide/
Another great option is our newly released C-Guide, which doesn't require any modifications to the door, but works and looks great!
http://www.realslidinghardware.com/c-bottom-guide-for-barn-door-hardware/

yes, its necessary! we had a door in our house like this without the hardware and the door came off. almost squished my four year old!

www.basincustom.com