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<p>Ive been noticing as I go along that I am finding differences as much as 1/16" - 1/8" in the thickness of the 2" foam that I am using as a sub roadbed.  I assume this is because the foam was stacked about 6ft high at the lumber yard and got slightly compressed toward the bottom of the pile.  What is the best way to keep my track level, so that I do not have uncoupling issues?</p>
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