Replies

1. 
   SteveSchoene | Dec 16, 2005 03:23pm | #1

     Since the back is plywood, it can be firmly fixed to the top, bottom, sides and divider, reducing the risk of racking.  A face frame should pretty much eliminate what tendancy for racking remains.

2. 
   mcain | Dec 16, 2005 05:13pm | #2

   The back being a solid piece is the primary way to stop any racking, provided it is a good fit - that's part of why we build 'em that way.  If the face frame is only the outside edge and the divider strip, it MAY not necessarily be strong enough to prevent eventual racking on its own, but it will help.   Post a pic when you're done!

3. 
   JohnH | Dec 16, 2005 05:26pm | #3

   I built a bookcase of 3/4" plywood 43" x 50" with firmly-attached 1/4" plywood backing and no center divider and no face frame about 35 years ago that has been moved at least four times with no racking. Just be sure to attach the backing in lots of places; I used about 20 screws on 12" centers. If the shelves are fixed, screw the backing to them too, especially near the middle of the backing to prevent "oil-can" effect and strengthen against racking.

   BTW One serious racking risk is having a non-level floor. Watch out for wall-to-wall carpet that has a hard edge at the baseboard. The front of the bookcase will compress the carpet more and pull it out of plumb. All those books are heavy! I use small pieces of scrap wood under the corners that are over more-compressed spots. Same thing applies to non-level floors of all kinds. Build your base as strong as you can.

   
   

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   Edited 12/16/2005 9:36 am by JohnH