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<p>Ken Patterson made a "whats neat" video where he showed evidence of foam shrinkage.  I too have seen this with my own eyes.  My modular club has dozens of modules where the foam has started to contract (noticeable as cracks forming at the plywood/foam boundary/visible humps at the module ends.  Foam is not uniformly even, and I found myself doing a lot of patching before laying track on my home layout to level the transition between foam sheets.  </p>
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