<p>There are so many stories about schools with sinking libraries due to the weight of the books, that snopes.com has an entry about it:</p>
<p>[snopes.com:</a> Sinking Library](<a href=“http://www.snopes.com/college/halls/sinking.asp]snopes.com:”>The Sinking Library | Snopes.com)</p>
<p>At DS’s school, the story had a slight variation - they could only put books on every other floor because of the weight (they have a high-rise library).</p>