In the house I built in Vermont, I put up an L-shaped bookcase as a visual blocker to a doorway, using three old railroad ties (sleepers?) as the supports and 2"x14" boards slotted into the ties. Because of the width of the boards I was able to use both sides for a double shelf. The ties were about 10"x10" and went floor to ceiling, pressed in tightly. Everything was large, heavy, and tight, so no bolts or screws were required... or so I thought. I came home one day about 6 months later to discover that the entire unit had rotated around the corner of the 'L,' pushed the ceiling up enough for the end ties to move and fall over, and the entire structure (and part of the ceiling plus about 300 hardcover books) laying on the living room floor.
Stitchawl
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